Nagelschmidtite Mineral Data

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.

Name Pronunciation:

Nagelschmidtite + Pronunciation

Nagelschmidtite Image

Images:

Nagelschmidtite

Comments: Upper - Transmitted light thin sections showing honey-brown nagelschmidtite. Lower - reflected light polished section showing nagelschmidtite (Nag), rankinite (Ran), Ti-rich androdite (Andr).
Location: Andradite-rich pegmatoid rock, Haturim Basin, Negev Desert, Israel. Scale: See Images.
© Diederik Visser

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:

Hexagonal Space 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

Diaphaneity:

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
Ncalc = 1.6 - 1.68

Optical Data:

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

Calculated Properties of Nagelschmidtite

Electron Density:

Bulk Density (Electron Density)=3.47 gm/cc
note: Specific Gravity of Nagelschmidtite =3.48 gm/cc.

Fermion Index:

Fermion Index = 0.0059821648
Boson Index = 0.9940178352

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nagelschmidtite is Not Radioactive

Nagelschmidtite Classification

Dana Class:

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

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

(53.02.02)Dana Group

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

Strunz Class:

09.HA.60 09 - SILICATES (Germanates)

09.H - Unclassified Silicates

09.HA -With alkali and alkali-earth Elements

09.HA.60 Nagelschmidtite Ca7(SiO4)3(PO4)2 Unk Hex

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Nagelschmidtite

Ca7(SiO4)3(PO4)2
Dana No: 53.02.02.01 Strunz No: 09.HA.60
Locality:

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