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⇱ Sellaite: Mineral information, data and localities.


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Sellaite

A valid IMA mineral species - grandfathered
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About SellaiteHide

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Formula:
MgF2
Colour:
Colourless, white; colourless in transmitted light.
Lustre:
Vitreous
Hardness:
5 - 5½
Specific Gravity:
3.15
Crystal System:
Tetragonal
Name:
Named for Quintino Sella (7 July 1827, Sella di Mosso, Piedmont, Italy – 14 March 1884), Italian politician, mining engineer, and mineralogist.

Unique IdentifiersHide

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Mindat ID:
3614
Long-form identifier:
mindat:1:1:3614:2

Similar NamesHide

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CeliteA synonym of Brownmillerite
DellaiteA valid IMA mineral speciesCa6Si3O11(OH)2
SahliteA synonym of DiopsideCaMgSi2O6
SaliteA variety of DiopsideCaMgSi2O6
SaléeiteA valid IMA mineral species - grandfatheredMg(UO2)2(PO4)2 · 10H2O
SeeliteA valid IMA mineral speciesMg(UO2)(As3+O3)0.7(AsO4)0.3 · 7H2O
Seelite-1Mg[(UO2)(AsO3)x(AsO4)1-x]2 · 7H2O
Seelite-2Mg(UO2)(AsO3)x(AsO4)1-x · 7H2O
SilliteA rock subtype
SlateA rock classification type
ZeoliteA synonym of Zeolite Group

IMA Classification of SellaiteHide

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Approved, 'Grandfathered' (first described prior to 1959)
First published:
1869

Classification of SellaiteHide

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3.AB.15

3 : HALIDES
A : Simple halides, without H2O
B : M:X = 1:2
9.2.2.1

9 : NORMAL HALIDES
2 : AX2
8.4.1

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
4 : Halides of the alkaline earths and Mg

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
SelIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of SellaiteHide

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Vitreous
Transparency:
Transparent
Colour:
Colourless, white; colourless in transmitted light.
Streak:
White
Hardness:
5 - 5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
On {010} and {110}.
Fracture:
Conchoidal
Density:
3.15 g/cm3 (Measured)    3.08 g/cm3 (Calculated)

Optical Data of SellaiteHide

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Type:
Uniaxial (+)
RI values:
nω = 1.378 nε = 1.39
Max. Birefringence:
δ = 0.012
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.

Surface Relief:
Moderate

Chemistry of SellaiteHide

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Mindat Formula:
MgF2
Element Weights:
Element% weight
F60.988 %
Mg39.012 %

Calculated from ideal end-member formula.

Crystallography of SellaiteHide

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Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal
Space Group:
P42/mnm
Setting:
P42/mnm
Cell Parameters:
a = 4.6213(2) Å, c = 3.0519(1) Å
Ratio:
a:c = 1 : 0.66
Unit Cell V:
65.18 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals stout prismatic to acicular [001]. Fibrous aggregates.
Twinning:
On {011}.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0009407SellaiteBaur W H, Khan A A (1971) Rutile-type compounds. VI. SiO2, GeO2 and a comparison with other rutile-type structures Acta Crystallographica B27 2133-2139👁 Image
19710293
0011754SellaiteWyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Rutile structure Crystal Structures 1 239-44419630293
0009163SellaiteBaur W H (1956) Uber die verfeinerung der kristallstrukturbestimmung einiger vertreter des rutiltyps: TiO2, SnO2, GeO2 und MgF2 Acta Crystallographica 9 515-520👁 Image
19560293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
3.275 Å(100)
2.231 Å(95)
1.711 Å(75)
2.067 Å(35)
1.375 Å(35)
1.635 Å(30)
2.545 Å(20)
Comments:
Synthetic. The data are from Swanson et al. (1955).

Geological EnvironmentHide

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Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4a: Earth’s earliest continental crust>4.4-3.0
19 : Granitic intrusive rocks
Near-surface Processes
25 : Evaporites (prebiotic)
High-? alteration and/or metamorphism
31 : Thermally altered carbonate, phosphate, and iron formations
Stage 4b: Highly evolved igneous rocks>3.0
36 : Carbonatites, kimberlites, and related igneous rocks
Stage 7: Great Oxidation Event<2.4
45b : [Other oxidized fumarolic minerals]
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
50 : Coal and/or oil shale minerals<0.36
Stage 10b: Anthropogenic minerals<10 Ka
54 : Coal and other mine fire minerals (see also #51 and #56)
Geological Setting:
Evaporites, volcanic ejecta and fumeroles, marble, magnesites, alkalic granite.

Type Occurrence of SellaiteHide

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Place of Conservation of Type Material:
Muséum Nationale d’Histoire Naturelle, Paris, France, number 97.32, 180.52 (type).
Université Torino, Torino, Italy (type).
Geological Setting of Type Material:
In bituminous dolomite-anhydrite rock in a glacial moraine.
Associated Minerals at Type Locality:

Synonyms of SellaiteHide

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Other Language Names for SellaiteHide

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Relationship of Sellaite to other SpeciesHide

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Structurally related to group(s):

Common AssociatesHide

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Associated Minerals Based on Photo Data:
29 photos of Sellaite associated with FluoriteCaF2
14 photos of Sellaite associated with QuartzSiO2
13 photos of Sellaite associated with SanidineK(AlSi3O8)
10 photos of Sellaite associated with 'Magnesite-Siderite Series'
7 photos of Sellaite associated with PseudobrookiteFe2TiO5
7 photos of Sellaite associated with BerylBe3Al2(Si6O18)
6 photos of Sellaite associated with MulliteAl4+2xSi2-2xO10-x
5 photos of Sellaite associated with TopazAl2(SiO4)(F,OH)2
5 photos of Sellaite associated with ChalcopyriteCuFeS2
4 photos of Sellaite associated with FerroaluminoceladoniteK(Fe2+Al◻)(Si4O10)(OH)2

Related Minerals - Strunz-mindat GroupingHide

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3.AB.ManuelarossiitePbCaAlF7Mon. 2/m : B2/m
3.AB.FluorocronitePbF2Iso. m3m(4/m32/m) : Fm3m
3.AB.05TolbachiteCuCl2Mon. 2/m : B2/m
3.AB.10CocciniteHgI2Tet. 4/mmm(4/m2/m2/m) : P42/nmc
3.AB.20Lawrencite(Fe2+,Ni)Cl2Trig. 3m(32/m) : R3m
3.AB.20ScacchiteMnCl2Trig. 3m(32/m) : R3m
3.AB.20ChloromagnesiteMgCl2Trig. 3m(32/m) : R3m
3.AB.25FluoriteCaF2Iso. m3m(4/m32/m) : Fm3m
3.AB.25FrankdicksoniteBaF2Iso. m3m(4/m32/m) : Fm3m
3.AB.25StrontiofluoriteSrF2Iso. m3m(4/m32/m) : Fm3m
3.AB.30Tveitite-(Y)(Y, Na)6Ca6Ca6(Ca,Na)F42Trig. 3 : R3
3.AB.35Gagarinite-(Y)NaCaYF6Hex. 6/m : P63/m
3.AB.35Polezhaevaite-(Ce)NaSrCeF6Hex. 6/m : P63/m
3.AB.35Gagarinite-(Ce)Na(REExCa1-x)(REEyCa1-y)F6Trig. 3 : P3
3.AB.37CalcioaravaipaitePbCa2AlF9Tric. 1 : P1
3.AB.85CotunnitePbCl2Orth. mmm(2/m2/m2/m)

Other InformationHide

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Notes:
Crystals exhibit a pale violet light when warmed and cleaved.
Slightly soluble in water.

Very slightly soluble in water. Decomposed by concentrated H2SO4.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for SellaiteHide

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References for SellaiteHide

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Reference List:

Localities for SellaiteHide

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Showing 85 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed.
👁 Image
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species.
👁 Image
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Angola
  • Huíla Province
    • Quilengues
Amores-Casals et al. (2019)
Australia
  • Northern Territory
    • Coomalie Shire
      • Adelaide River
Edith Trybalski
  • South Australia
    • Pastoral Unincorporated Area
      • Bimbowrie Conservation Park
        • Old Boolcoomata Station
          • White Rock Feldspar Mine
Elliott et al. (2024) +1 other reference
      • Olympic Dam
Ehrig et al. (2012)
  • Tasmania
    • Break O'Day municipality
      • Blue Tier district
        • Lottah
Ross
    • Kentish municipality
      • Moina - Middlesex District
Bottrill et al. (2008)
    • Waratah-Wynyard municipality
      • Heazlewood district
        • Luina
www.crocoite.com (2001)
      • Waratah district
        • Waratah-Mt Bischoff
Bottrill +2 other references
Bottrill et al. (2008)
    • West Coast municipality
      • Zeehan mining district
        • Zeehan mineral field
          • Heemskirk Tin Project
Young (1990)
Young (1990)
Brazil
  • Bahia
    • Brumado
      • Serra das Éguas
Cassedanne et al. (1983)
Canada
  • New Brunswick
    • Kings Co.
      • Cardwell Parish
Grice et al. (2005)
Grice et al. (1996)
      • Hammond Parish
        • Salt Springs evaporite deposit
Burns et al. (1992)
      • Studholm Parish
Grice et al. (2005)
China
  • Hunan
    • Chenzhou
      • Beihu District
        • Qitianling complex
          • Furong Sn-polymetallic ore field
            • Bailashui Sn deposit
Chen et al. (2022)
      • Linwu Co.
        • Xianghualing Sn-polymetallic ore field
Yuzhou Li (1990)
      • Yizhang Co.
        • Yaogangxian W-Sn ore field
Yuzhou Li (1990)
    • Yongzhou
      • Dao Co.
Huang et al. (2022)
  • Inner Mongolia
    • Baotou City (Baotou Prefecture)
      • Bayan Obo mining district
        • Bayan Obo
          • Bayan Obo deposit
Liu et al. (2022)
  • Sichuan
    • Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture)
      • Kangding County
Weifan Ding (1983) +2 other references
France (TL)
  • Auvergne-Rhône-Alpes
    • Savoie
      • Albertville
        • Les Belleville
          • Saint-Martin-de-Belleville
            • Val Thorens
Bariand et al. (n.d.) +4 other references
  • Bourgogne-Franche-Comté
    • Saône-et-Loire
      • Autun
        • Lucenay-l'Evêque
          • Cordesse
Le règne Minérale +1 other reference
  • Occitanie
    • Pyrénées-Orientales
      • Céret
        • Prats-de-Mollo-la-Preste
Dubru. M (1986)
  • Provence-Alpes-Côte d'Azur
    • Var
      • Draguignan
        • Tanneron
Belot (1978) +1 other reference
Germany
  • Baden-Württemberg
    • Freiburg Region
      • Ortenaukreis
        • Oberwolfach
Walenta (1992) +1 other reference
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Maifeld
        • Ochtendung
Rondorf et al. (1988)
      • Mendig
        • Bell
Blass (2010)
      • Vordereifel
        • Ettringen
Blass et al. (2006)
    • Vulkaneifel
      • Daun
        • Üdersdorf
Hentschel (1978)
      • Kelberg
        • Drees
Ko Jansen
  • Saxony-Anhalt
Wittern (2001)
  • Saxony
    • Erzgebirgskreis
      • Annaberg-Buchholz
        • Kleinrückerswalde
Desor et al. (08/2020)
  • Thuringia
    • Nordhausen District
Heidorn (1932) +1 other reference
Greece
  • Attica
    • East Attica
      • Lavreotiki
        • Km 3
          • Kaminiza mines
Uwe Kolitsch and Branko Rieck analyses (see also http://lavrion.gr/Minerals/Updates.html)
Italy
  • Campania
    • Metropolitan City of Naples
Palache et al. (1951) +1 other reference
      • Ottaviano
Russo et al. (2014)
Russo et al. (2014)
    • Salerno
      • Nocera Inferiore
Flamini (1966) +3 other references
  • Piedmont
    • Metropolitan City of Turin
      • Oulx
        • Signols
- (n.d.) +1 other reference
  • Sicily
    • Metropolitan City of Catania
      • Etna Volcanic Complex
- (n.d.) +1 other reference
  • Tuscany
    • Massa-Carrara Province
Palache et al. (1951) +3 other references
        • Torano quarrying basin
Pelloux (1919) +6 other references
Kazakhstan
  • Atyrau Region
    • Inder District
Pekov et al. (1993)
  • East Kazakhstan Region
Pavel.M. Kartashov (n.d.)
  • Karaganda Region
    • Balkhash
      • Kounrad Massif
Pavel.M. Kartashov (n.d.)
Kenya
  • Tharaka-Nithi County
Waweru (2020)
Namibia
  • Erongo Region
    • Karibib Constituency
      • Usakos
...
Norway
  • Akershus
    • Eidsvoll
      • Minnesund
    • Lunner
Sæbø (1966) +2 other references
Peru
  • Ancash
    • Bolognesi Province
      • Huallanca District
        • Huanzala
Imai et al. (1985) +2 other references
Poland
  • Silesian Voivodeship
    • Wodzisław County
      • Radlin
Kruszewski et al. (2020)
Portugal
  • Guarda
    • Gouveia
      • Folgosinho
Found by and in the collection of ...
Russia
  • Bashkortostan
    • Beloretsk district
      • Ishlya
Ларионов Н.Н. +1 other reference
  • Chelyabinsk Oblast
Cesnokov et al. (1998)
  • Kamchatka Krai
    • Milkovsky District
Pekov (1998)
        • Great Fissure eruption (Main Fracture)
          • Northern Breakthrough (North Breach)
Pekov et al. (2015)
Pekov et al. (2015) +1 other reference
Vergasova L P et al. (1996)
Pekov et al. (2015)
        • Mountain 1004
Shchipalkina et al. (2020)
Pekov et al. (2018)
  • Primorsky Krai
    • Khorolsky District
Bailey (1980)
Krymsky et al. (2003, April)
Ryazantseva (2001)
Pekov (1998)
  • Republic of Karelia
    • Pitkyarantsky District
      • Kitelya
V.A. Gorelov (1997)
      • Pitkyaranta mining district
Ivashchenko et al. (2011, September)
  • Zabaykalsky Krai
    • Nerchinsky District
Palache et al. (1951)
Spain
  • Canary Islands
    • Santa Cruz de Tenerife Province
      • La Palma
        • Cumbre Vieja Area
Campeny et al. (2023)
      • Tenerife
Dill et al. (2023)
        • Arico
Dill et al. (2023)
        • Arona
Dill et al. (2023)
        • Granadilla de Abona
Dill et al. (2023)
Dill et al. (2023)
Dill et al. (2023)
Dill et al. (2023)
Dill et al. (2023)
Dill et al. (2023)
Tanzania
  • Arusha region
    • Ngorongoro District
Mitchell (1997)
USA
  • Colorado
    • Dolores County
      • Rico Mountains
        • Rico Mining District (Pioneer Mining District)
          • Silver Creek
            • Rico Argentine Mine
Eckel et al. (1997)
    • Jefferson County
      • South Platte Pegmatite Mining District
Simmons et al. (1980)
Uzbekistan
  • Tashkent
    • Chatkal-Kuraminskii Range
Badalov et al. (1975)
Zambia
  • Muchinga Province
    • Isoka District
      • Isoka
Zambezi et al. (1997)
Quick NavTopAbout SellaiteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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