Nagelschmidtite Mineral Data

Nagelschmidtite Mineral Data +

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General Nagelschmidtite Information

Chemical Formula:

Ca7(SiO4)3(PO4)2

Composition:

Molecular Weight = 746.74 gm

Calcium 37.57 % Ca 52.57 % CaO

Silicon 11.28 % Si 24.14 % SiO₂

Phosphorus 8.30 % P 19.01 % P₂O₅

Oxygen 42.85 % O

______ ______

100.00 % 95.71 % = TOTAL OXIDE

Empirical Formula:

Ca₇(SiO₄)₃(PO₄)₂

Environment:

Sedimentary phosphate deposits.

IMA Status:

Approved IMA 1977

Locality:

Lowermost portion of the Hatrarum formation, Israel. Link to MinDat.org Location Data.

Name Origin:

Named for G. Nagelschmidt, who first described the synthetic compound in 1937.

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Nagelschmidtite Crystallography

Axial Ratios:

a:c = 1:1.3197

Cell Dimensions:

a = 5.38, c = 7.1, Z = 0.5; V = 177.97 Den(Calc)= 3.48

Crystal System:

HexagonalSpace Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.66(1), 2.8(0.7), 1.94(0.4),

Physical Properties of Nagelschmidtite

Cleavage:

[001] Good

Color:

Brown, Colorless, Yellowish white, Light yellow.

Density:

3.065

Diaphaniety:

Transparent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Nagelschmidtite

Gladstone-Dale:

CI meas= -0.114 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1917,KPDmeas= 0.2176,KC= 0.1954

Optical Data:

Biaxial (+/-), a=1.638-1.68, b=1.652-1.698,

Calculated Properties of Nagelschmidtite

Electron Density:

r_electron=3.47 gm/cc
note: r_{Nagelschmidtite}=3.48 gm/cc.

Fermion Index

Fermion Index = 0.00598
Boson Index = 0.99402

Photoelectric:

PE_{Nagelschmidtite}= 5.46 barns/electron
U=PE_{Nagelschmidtite} x r_electron= 18.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nagelschmidtite is Not Radioactive

Nagelschmidtite Classification

Dana Class:

53.2.2.1 (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations

(53.2)with (SO4), (CrO4), (PO4), etc.

(53.2.2)Dana Group

53.2.2.1 Nagelschmidtite Ca7(SiO4)3(PO4)2 Unk Hex

Strunz Class:

VIII/B.22-70 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.22 - Thaumasite series

VIII/B.22-10 Hatrurite Ca3SiO5 R 3m 3m

VIII/B.22-25 Poldervaartite (Ca,Mn)2SiO3(OH)2 P bca 2/m 2/m 2/m

VIII/B.22-30 Afwillite Ca3Si2O4(OH)6 P 2₁ 2

VIII/B.22-40 Bultfonteinite Ca2SiO2(OH,F)4 P1 1

VIII/B.22-50 Spurrite Ca5(SiO4)2(CO3) P 2₁/a 2/m

VIII/B.22-60 Paraspurrite Ca5(SiO4)2(CO3) P 2₁/a 2/m

VIII/B.22-65 Ternesite! Ca5(SiO4)2SO4 P nma 2/m 2/m 2/m

VIII/B.22-70 Nagelschmidtite Ca7(SiO4)3(PO4)2 Unk Hex

VIII/B.22-75 Harrisonite! Ca(Fe,Mg)6(PO4)2(SiO4)2 R 3m 3 2/m

VIII/B.22-80 Fukalite Ca4Si2O6(CO3)(OH,F)2 Unk Ortho

VIII/B.22-90 Thaumasite Ca3Si(CO3)(SO4)(OH)6·12(H2O) P 6₃/m 6/m

VIII/B.22-100 Chelyabinskite* (Ca,Mg)3Si(OH)6(SO4,CO3)2·9(H2O) Unk Ortho

Other Nagelschmidtite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Nagelschmidtite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Nagelschmidtite

Ca7(SiO4)3(PO4)2
Dana No: 53.2.2.1 Strunz No: VIII/B.22-70
Locality:

Notes: