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⇱ Nagelschmidtite: Mineral information, data and localities.

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Nagelschmidtite

A valid IMA mineral species - grandfathered
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About NagelschmidtiteHide

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Formula:
Ca7(SiO4)2(PO4)2
Colour:
yellowish white
Crystal System:
Hexagonal
Name:
Named in honor of Guenther Nagelschmidt (?, Germany - 19 July 1980), chemist and mineralogist that made the first report of the phase in a slag. He worked at the Safety in Mines Research Establishment, studying mineral dust as a hazard for miners of coal and other materials. He was a pioneer in the use of X-ray diffraction and electron microscopy in the study of mineral dusts.
Closely related to (chemically similar) flamite. There is also a synthetic compound, 'Unnamed (Ca-Na Phosphate)', said to be a member of the nagelschmidtite family.

The original material seem to contain two polymorphs. Structurally similar to α-C2S (an abbreviated form of α-Ca2SiO4); as in this phase, the nagelschmidtite structure is based on Ca and Ca-T layers, the latter containing vacant Ca sites due to phosphate-for-silicate substitution. Arrangement of tetrahedral (anion) units in the mineral is similar to that found in α, α’H, α’L and β forms of the C2S phase.

Silicophosphates such as nagelschmidtite are important constituents of slags, said to be CaO- and P-containing fertilizers.


Unique IdentifiersHide

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Mindat ID:
2829
Long-form identifier:
mindat:1:1:2829:1

IMA Classification of NagelschmidtiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Classification of NagelschmidtiteHide

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9.HA.60

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
53.2.2.1

53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
2 : Insular SiO4 Groups and Other Anions of Complex Cations with (SO4), (CrO4), (PO4), etc·
17.6.1

17 : Silicates Containing other Anions
6 : Silicates with phosphate

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

Physical Properties of NagelschmidtiteHide

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Colour:
Yellowish white
Streak:
White
Cleavage:
Distinct/Good

Optical Data of NagelschmidtiteHide

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Type:
Biaxial (+/-)
RI values:
nα = 1.638 - 1.68 nβ = 1.652 - 1.698
Max. Birefringence:
δ = 0.000
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

Chemistry of NagelschmidtiteHide

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Mindat Formula:
Ca7(SiO4)2(PO4)2
Element Weights:
Element% weight
Ca42.854 %
O39.103 %
P9.463 %
Si8.580 %

Calculated from ideal end-member formula.
Common Impurities:
Al,Fe,Cr,Mn,Mg,Na,K,P,S

Crystallography of NagelschmidtiteHide

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Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P61
Cell Parameters:
a = 5.38 Å, c = 7.1 Å
Ratio:
a:c = 1 : 1.32
Unit Cell V:
177.97 ų (Calculated from Unit Cell)
Twinning:
complex, resulting in lamellae intersecting at 60o
Comment:
Structure solution of synthetic sample gave P61 space group, a = 10.82 Å, c = 21.46 Å (Sugiyama et al., 2010).

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
2.66 Å(vs)
2.80 Å(s)
1.94 Å(s)
3.80 Å(m)
3.42 Å(m)
2.20 Å(m)
1.34 Å(m)

Geological EnvironmentHide

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Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
26 : Hadean detrital minerals
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
51 : Pyrometamorphic minerals (see also #54 and #56)<0.36

Type Occurrence of NagelschmidtiteHide

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General Appearance of Type Material:
elongated, anhedral grains, up to 150 microns in size
Geological Setting of Type Material:
HT contact-metamorphosed sedimentary rock (a pyrometamorphic formation)
Associated Minerals at Type Locality:

Other Language Names for NagelschmidtiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:
2 photos of Nagelschmidtite associated with AndraditeCa3Fe3+2(SiO4)3
2 photos of Nagelschmidtite associated with GehleniteCa2Al[AlSiO7]

Related Minerals - Strunz-mindat GroupingHide

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9.HA.ShinichengiteCa5[BSi2O7(OH)2]2 · 6H2OTric. 1 : P1
9.HA.Kalyuzhnyite-(Ce)NaKCaSrCeTi(Si8O21)OF(H2O)3Mon. 2/m : P2/b
9.HA.MoragiteCa3TiSi2(Al2Si)O14Trig. 32 : P321
9.HA.05ErtixiiteNa2Si4O9Iso.
9.HA.10KenyaiteNa2Si22O41(OH)8 · 6H2OMon.
9.HA.20WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15Mon.
9.HA.25MagbasiteKBaFe3+Mg7Si8O22(OH)2F6Orth. mmm(2/m2/m2/m) : Cmma
9.HA.35DemagistrisiteBaCa2Mn3+4(Si3O10)(Si2O7)(OH)4 · 3H2OOrth. mm2 : Amm2
9.HA.37DonwilhelmsiteCaAl4Si2O11Hex. 6/mmm(6/m2/m2/m) : P63/mmc
9.HA.40KasatkiniteBa2Ca8B5Si8O32(OH)3 · 6H2O Mon.
9.HA.40IgumnoviteCa3Al2[SiO4]2[◻Cl4]Iso.
9.HA.42PaqueiteCa3TiSi2(Al,Ti,Si)3O14Trig. 32 : P321
9.HA.42QeltiteCa3TiSi2(Fe3+2Si)O14Trig. 32 : P321
9.HA.45RippiteK2(Nb,Ti)2(Si4O12)O(O,F)Tet.
9.HA.47ZagamiiteCaAl2Si3.5O11Hex. 6/mmm(6/m2/m2/m) : P63/mmc
9.HA.50RudenkoiteSr3(Al3.5Si3.5)O10(OH,O)8Cl2 · H2OMon.
9.HA.50α-CarnegieiteNaAlSiO4
9.HA.52Atheriastitenear Ca5MgFeAl6Si8O32 · 5H2O
9.HA.55FoshallasiteCa3[Si2O7] · 3H2O(?)
9.HA.57Bhreckite
9.HA.65Caryochroite[Na(Sr0.5Ca0.5)Mg]3[Fe3+8Mn(Fe2+0.5◻0.5)]10(Ti2Si12O37)(OH)14(H2O)3 Mon. 2/m
9.HA.70JuaniteCa10Mg4Al2Si11O39 · 4H2O or nearOrth.
9.HA.75TacharaniteCa12Al2Si18O33(OH)36Mon.
9.HA.80OyeliteCa10Si8B2O29 · 12.5H2OTric. 1 : P1
9.HA.85DenisoviteK14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4-x) · 2H2OMon.
9.HA.90TiettaiteK4Na12Fe3+Si16O41(OH)4 · 2H2OOrth. mmm(2/m2/m2/m) : Cmcm

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 NagelschmidtiteHide

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mindat.org URL:
https://www.mindat.org/min-2829.html
Please feel free to link to this page.

References for NagelschmidtiteHide

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Reference List:

Localities for NagelschmidtiteHide

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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.
Germany
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Mayen
        • Seekante
Skrzyńska et al. (2023)
Israel
  • Southern District
    • Beersheba Subdistrict
      • Tamar Regional Council
Sharygin et al. (2008)
Middle East (TL)
Gross (1977)
Palestine
  • West Bank
    • Jericho Governorate
Seryotkin et al. (2012) +1 other reference
Russia
  • Murmansk Oblast
    • Lovozersky District
Pakhomovsky et al. (2014)
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