Tuite Mineral Data

Tuite Mineral Data

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General Tuite Information

Chemical Formula:

Ca3(PO4)2

Composition:

Molecular Weight = 306.55 gm

Sodium 2.10 % Na 2.83 % Na₂O

Calcium 32.81 % Ca 45.91 % CaO

Magnesium 2.14 % Mg 3.55 % MgO

Iron 0.36 % Fe 0.47 % FeO

Phosphorus 20.41 % P 46.77 % P₂O₅

Oxygen 42.17 % O

______ ______

100.00 % 99.53 % = TOTAL OXIDE

Empirical Formula:

Ca_2.51Na_0.28Mg_0.27Fe²⁺_0.02(PO₄)_2.02

Environment:

In a shock-melt vein of the meteorite. High pressure polymorph of whitlockite.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Suizhou L6 chondrite meteorite, which fell in 1986 in Dayanpo, 12.5 km southeast of the city of Suizhou, Hubei Province, People’s Republic of China. Link to MinDat.org Location Data.

Name Origin:

Named for Guangzhi Tu (1920-), professor and founding director of the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong Province, People’s Repub lic of China.

Synonym:

IMA2001-070

Search for Tuite Images

Images:

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Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Tuite Crystallography

Axial Ratios:

a:c = 1:3.56162

Cell Dimensions:

a = 5.258, c = 18.727, Z = 3; V = 448.37 Den(Calc)= 3.41

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 2.628(1)(110), 2.891(0.8)(105), 1.945(0.47)(205),1.73(0.245)(0.1.10), 2.214(0.2)(202), 2.047(0.16), 2.078(0.12),

Physical Properties of Tuite

Color:

White, Yellowish gray.

Diaphaniety:

Transparent

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tuite

Gladstone-Dale:

CI calc= -0.056 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2063,KC= 0.1954

Optical Data:

Uniaxial (+), w=1.701, e=1.706, bire=0.0050.

Calculated Properties of Tuite

Electron Density:

r_electron=3.38 gm/cc
note: r_Tuite=3.41 gm/cc.

Fermion Index

Fermion Index = 0.00286
Boson Index = 0.99714

Photoelectric:

PE_Tuite= 5.21 barns/electron
U=PE_Tuite x r_electron= 17.60 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tuite is Not Radioactive

Tuite Classification

Dana Class:

38.3.4a.1 (38)Anhydrous Phosphates, etc

(38.3)(A+ B++)3 (XO4)2

(38.3.4a)Dana Group

38.3.4a.1 Tuite ! Ca3(PO4)2 R 3m 3m

Strunz Class:

VII/A.05-46 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions. cations of medium size: Mostly Fe, Mn

VII/A.05 - Farringtonite - Strontiowhitlockite series

VII/A.05-10 Farringtonite Mg3(PO4)2 P 2₁/a 2/m

VII/A.05-20 Stanfieldite Ca4(Mg,Fe,Mn)5(PO4)6 P 2/c 2/m

VII/A.05-30 Panethite (Na,Ca,K)2(Mg,Fe,Mn)2(PO4)2 P 2₁/n 2/m

VII/A.05-40 Brianite Na2CaMg(PO4)2 P 2₁/a 2/m

VII/A.05-46 Tuite Ca3(PO4)2 R 3m 3m

VII/A.05-50 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m

VII/A.05-60 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m

Other Tuite Information

References:

NAME( CanMin, v 42:1259) PHYS. PROP.(CanMin, v 42:1259) OPTIC PROP.(CanMin, v 42:1259)

See Also:

Links to other databases for Tuite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Tuite Specimen Label here :

Tuite

Ca3(PO4)2
Dana No: 38.3.4a.1 Strunz No: VII/A.05-46
Locality:

Notes: