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⇱ Gormanite: Mineral information, data and localities.

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Gormanite

A valid IMA mineral species
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About GormaniteHide

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Formula:
(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
Colour:
Blue green to dark green
Lustre:
Sub-Vitreous, Greasy
Hardness:
4 - 5
Specific Gravity:
3.10 - 3.13
Crystal System:
Triclinic
Name:
Named by B. Darko Sturman, Joseph A. Mandarino, Mary E. Mrose, and P. J. Dunn in 1981 after Professor Donald Herbert Gorman [b. 1922 Fredericton, New Brunswick, Canada; d. 2020 Toronto, Ontario] exploration mineralogist and professor of mineralogy of the University of Toronto, Canada. Pronounced GAWR•MENAIT.
Isostructural with:
Gormanite-Souzalite Series. The Fe2+ analogue of Souzalite.


Unique IdentifiersHide

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Mindat ID:
1729
Long-form identifier:
mindat:1:1:1729:5

Similar NamesHide

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CarmeniteA synonym of Digenite
CarminiteA valid IMA mineral species - grandfatheredPbFe23+(AsO4)2(OH)2
Formanite-(Y)A valid IMA mineral species - grandfatheredYTaO4
GermaniteA valid IMA mineral species - grandfatheredCu13Fe2Ge2S16

IMA Classification of GormaniteHide

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Approved
IMA Formula:
Fe2+3Al4(PO4)4(OH)6 · 2H2O
Approval year:
1977
First published:
1981

Classification of GormaniteHide

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8.DC.45

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
42.9.2.2

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
19.14.32

19 : Phosphates
14 : Phosphates of Fe and other metals

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.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
GmIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
GmThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Pronunciation of GormaniteHide

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Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of GormaniteHide

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Sub-Vitreous, Greasy
Transparency:
Transparent, Translucent
Colour:
Blue green to dark green
Streak:
Pale green
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
{001}
Fracture:
Splintery
Density:
3.10 - 3.13 g/cm3 (Measured)    3.11(1) g/cm3 (Calculated)

Optical Data of GormaniteHide

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Type:
Biaxial (-)
RI values:
nα = 1.619 nβ = 1.653 nγ = 1.660
2V:
Measured: 53° , Calculated: 48°
Birefringence:
0.041
Max. Birefringence:
δ = 0.041
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
Dispersion:
r < v strong
Optical Extinction:
Z ∧ b = 14°; X ⊥ {001}.
Pleochroism:
Strong
Comments:
X = colorless; Y = blue, Z = colorless.

Chemistry of GormaniteHide

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Mindat Formula:
(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
Element Weights:
Element% weight
O48.396 %
Fe21.116 %
P15.615 %
Al13.603 %
H1.270 %

Calculated from ideal end-member formula.

Crystallography of GormaniteHide

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Crystal System:
Triclinic
Cell Parameters:
a = 11.77(1) Å, b = 5.11(1) Å, c = 13.61(1) Å
α = 90.45°, β = 99.15°, γ = 90.05°
Ratio:
a:b:c = 2.303 : 1 : 2.663
Unit Cell V:
808.13 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Thick acicular crystals, usually in tight divergent groups.

Blades, elongated on [010] with large {001}. Other forms include {100}, {102}, {102}, and {010}.
Twinning:
Composition plane {001}. Twin axis [010].
Comment:
Triclinic, pseudomonoclinic. Point Group: 1 or 1; Space Group: P1 or P1

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)
0019923GormaniteLe Bail A, Stephens P W, Hubert F (2003) A crystal structure for the souzalite/gormanite series from synchrotron powder diffraction data European Journal of Mineralogy 15 719-7232003Rapid Creek, Yukon, Canada0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Loading XRD data...
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
6.70 Å(100)
4.79 Å(60)
3.39 Å(100)
3.34 Å(70)
3.16 Å(70)
3.13 Å(80)
3.10 Å(60)
2.55 Å(70)
Comments:
ICDD 36-403; also 33-638.

Geological EnvironmentHide

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Paragenetic Mode(s):
Geological Setting:
Late stage mineralization in granite pegmatite.

Type Occurrence of GormaniteHide

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General Appearance of Type Material:
Blue-green elongate crystals (up to 3 x 0.5 x 0.1 mm) in radial aggregates and as blade-like crystals.
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Ontario, Canada, M35123, M35124, M37368.
National Museum of Natural History, Washington, D.C., USA, 137494, 137495, 145741.
Geological Setting of Type Material:
Veins in phosphatic iron stones. Formed at low temperature.
Associated Minerals at Type Locality:

Synonyms of GormaniteHide

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Other Language Names for GormaniteHide

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Dutch:Gormaniet
German:Gormanit
Spanish:Gormanita

Relationship of Gormanite to other SpeciesHide

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Forms a series with:

Common AssociatesHide

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Associated Minerals Based on Photo Data:
90 photos of Gormanite associated with SideriteFeCO3
50 photos of Gormanite associated with QuartzSiO2
20 photos of Gormanite associated with AlbiteNa(AlSi3O8)
18 photos of Gormanite associated with LazuliteMgAl2(PO4)2(OH)2
15 photos of Gormanite associated with GreifensteiniteCa2Fe2+5Be4(PO4)6(OH)4 · 6H2O
15 photos of Gormanite associated with ChildreniteFe2+Al(PO4)(OH)2 · H2O
13 photos of Gormanite associated with WarditeNaAl3(PO4)2(OH)4 · 2H2O
12 photos of Gormanite associated with WhitlockiteCa9Mg(PO4)6(PO3OH)
8 photos of Gormanite associated with Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
7 photos of Gormanite associated with BrazilianiteNaAl3(PO4)2(OH)4

Related Minerals - Strunz-mindat GroupingHide

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8.DC.CésarferreiraiteFe2+ Fe3+2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.FerrivauxiteFe3+Al2(PO4)2(OH)3 · 5H2OTric. 1 : P1
8.DC.IanbruceiteZn2(AsO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon. 2/m : B2/b
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2OOrth. 222 : P212121
8.DC.10LegranditeZn2(AsO4)(OH) · H2OMon. 2/m : P21/b
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2OMon.
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15'UM2006-27-PO:FeHZn'ZnFe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15'UKI-2006-(PO:AlCuFeH)'Fe2+Al3+2(PO4)2(OH)2 · 4H2O
8.DC.15CobaltarthuriteCoFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
8.DC.20MagnesiobermaniteMgMn3+2(PO4)2(OH)2 · 4H2OMon. 2 : P21
8.DC.20BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
8.DC.20CoralloiteMn2+Mn3+2(AsO4)2(OH)2 · 4H2OTric. 1 : P1
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.25ZincostrunziteZnFe3+2(PO4)2(OH)2 · 6.5H2OTric. 1 : P1
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.25MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
8.DC.25StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25FerrostrunziteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric.
8.DC.27BerauniteFe3+6(PO4)4O(OH)4 · 6H2OMon. m : Bb
8.DC.27TvrdýiteFe2+Fe3+2Al3(PO4)4(OH)5(H2O)4 · 2H2OMon. 2/m : B2/b
8.DC.27ZincoberauniteZnFe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30FerrolaueiteFe2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric. 1 : P1
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2OTric. 1 : P1
8.DC.30Kayrobertsonite[MnAl2(PO4)2(OH)2(H2O)4] · 2H2OTric. 1 : P1
8.DC.30KummeriteMn2+Fe3+Al(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.32KamarizaiteFe3+3(AsO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.32TinticiteFe3+3(PO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24AlO6(PO4)17(OH)12 · 75H2OHex. 6/m : P63/m
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric. 1
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2OTric.
8.DC.50AllanpringiteFe3+3(PO4)2(OH)3 · 5H2OMon. 2/m : P21/m
8.DC.50FluorwavelliteAl3(PO4)2(OH)2F · 5H2OOrth. mmm(2/m2/m2/m)
8.DC.50WavelliteAl3(PO4)2(OH)3 · 5H2OOrth. mmm(2/m2/m2/m)
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon. m : Bm
8.DC.57OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm(2/m2/m2/m) : Cmmm
8.DC.60CloncurryiteCu0.5(VO)0.5Al2(PO4)2F2 · 5H2OMon. 2/m : P21/b
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2OOrth. mmm(2/m2/m2/m)
8.DC.62KenngottiteMn2+3Fe3+4(PO4)4(OH)6(H2O)2 Mon. 2/m : P2/b
8.DC.67MolinelloiteCu(H2O)(OH)V4+O(V5+O4)Tric. 1 : P1
8.DC.70WhitecapsiteH16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2OHex. 6/m : P63/m
8.DC.75HeimitePbCu2(AsO4)(OH)3 · 2H2OMon. 2/m
8.DC.80LedneviteCu[PO3(OH)] · H2OMon. 2/m : P21/b

Fluorescence of GormaniteHide

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Not fluorescent.

Other InformationHide

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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 GormaniteHide

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mindat.org URL:
https://www.mindat.org/min-1729.html
Please feel free to link to this page.

References for GormaniteHide

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Reference List:

Localities for GormaniteHide

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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.
Argentina
  • San Luis Province
    • San Martín Department
Roda-Robles et al. (2012)
Austria
  • Carinthia
    • Spittal an der Drau District
      • Millstatt lake
Niedermayr et al. (1995)
      • Reißeck
        • Kolbnitz
Walter et al. (2020)
        • Penk
          • Zwenberger Graben
Walter et al. (2020)
      • Spittal an der Drau
        • Großegg
G. Niedermayr: Carinthia II 187./107.:176 (1997)
        • Wolfsberg
Pichler (2009)
Brazil
  • Minas Gerais
    • Divino das Laranjeiras
Menezes (n.d.)
Menezes Filho et al. (2019)
    • Mendes Pimentel
Pers. Comm. from Paulo Anselmo Matioli +1 other reference
    • São Geraldo do Baixio
SILVEIRA et al. (2014)
Canada (TL)
  • Yukon
    • Dawson mining district
Sturman et al. (1981) +1 other reference
Richard Gunter Collection
150-152. +3 other references
        • Kulan Camp (Area A; Area 1)
Robinson et al. (1992)
Robinson et al. (1992)
Robinson et al. (1992)
Europe
Berbain et al. (2012)
France
  • Occitanie
    • Aude
      • Carcassonne
        • Salsigne
Forner et al. (1997)
    • Pyrénées-Orientales
      • Céret
        • Collioure
Berbain et al. (2012)
Namibia
  • Erongo Region
    • Karibib Constituency
      • Abbabis Farm 70
Förch (1998)
      • Tsaobismund Farm 85
von Bezing (2007)
Portugal
  • Castelo Branco
    • Idanha-a-Nova
      • União das Freguesias de Zebreira e Segura
Neiva et al. (2000) +1 other reference
Rwanda
  • Western Province
    • Ngororero District
      • Muhororo
Färber (n.d.)
Spain
  • Castile and Leon
    • Salamanca
      • Aldehuela de la Bóveda
Roda et al. (2001)
      • Garcirrey
Encarnación Roda-Robles (2007)
      • Golpejas
        • Golpejas Mining group
Calvo Rebollar (2015)
USA
  • Arizona
    • Cochise County
Graeme (1993) +1 other reference
  • New Hampshire
    • Cheshire County
      • Walpole
P. Cristofono et al. (2011)
    • Grafton County
      • Groton
Rocks & Min. 80:251
Whitmore et al. (2004) +1 other reference
Geological Society of America Abstracts ... +2 other references
    • Sullivan County
      • Newport
King (n.d.)
  • North Carolina
    • Randolph County
      • Staley
Belmont Abbey College Collection
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