Tristramite Mineral Data

Tristramite Mineral Data +

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General Tristramite Information

Chemical Formula:

(Ca,U++++,Fe+++)(PO4,SO4)·2(H2O)

Composition:

Molecular Weight = 232.32 gm

Calcium 10.35 % Ca 14.48 % CaO

Uranium 30.74 % U 34.87 % UO₂

Iron 2.40 % Fe 3.44 % Fe₂O₃

Phosphorus 10.00 % P 22.91 % P₂O₅

Hydrogen 1.74 % H 15.51 % H₂O

Sulfur 3.45 % S 8.62 % SO₃

Oxygen 41.32 % O

______ ______

100.00 % 99.83 % = TOTAL OXIDE

Empirical Formula:

Ca_0.6U_0.3Fe³⁺_0.1(PO₄)_0.75(SO₄)_0.25·2(H₂O)

IMA Status:

Approved IMA 1983

Locality:

Link to MinDat.org Location Data.

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Tristramite Crystallography

Axial Ratios:

a:c = 1:0.92897

Cell Dimensions:

a = 6.913, c = 6.422, Z = 3; V = 265.79 Den(Calc)= 4.35

Crystal System:

Hexagonal - TrapezohedralH-M Symbol (6 2 2) Space Group: P 6₂22

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

By Intensity(I/I_o): 2.83(1), 2.99(1), 2.14(0.5),

Physical Properties of Tristramite

Cleavage:

None

Color:

Green yellow, Light yellow.

Density:

3.8 - 4.2, Average = 4

Diaphaniety:

Translucent

Hardness:

3-4 - Calcite-Fluorite

Luster:

Greasy (Oily)

Optical Properties of Tristramite

Gladstone-Dale:

CI meas= 0.121 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.192 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1503,KPDmeas= 0.1635,KC= 0.186

Optical Data:

Uniaxial (+), w=1.644, e=1.664, bire=0.0200.

Calculated Properties of Tristramite

Electron Density:

r_electron=3.77 gm/cc
note: r_Tristramite=4.00 gm/cc.

Fermion Index

Fermion Index = 0.00332
Boson Index = 0.99668

Photoelectric:

PE_Tristramite= 742.96 barns/electron
U=PE_Tristramite x r_electron=2,800.22 barns/cc.

Radioactivity:

GRapi = 2,468,739.02 (Gamma Ray American Petroleum Institute Units)

Tristramite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 12.32 ± 3.08 grams of pure Tristramite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1232.1 ±308.02 grams of pure Tristramite .

**Estimated Radioactivity from Tristramite** - very strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.82 cm	55,020,734	1.49E-03	2,468,739.02	811.64
100 gm / 3.63 cm	5,502,073	1.49E-04	246,873.90	81.16
10 gm / 1.68 cm	550,207	1.49E-05	24,687.39	8.12
1 gm / 7.82 mm	55,021	1.49E-06	2,468.74	0.81
0.1 gm / 3.63 mm	5,502	1.49E-07	246.87	0.08
0.01 gm / 1.68 mm	550	1.49E-08	24.69	0.01
0.001 gm / 0.78 mm	55	1.49E-09	2.47	0.00

Weight of pure Tristramite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.00 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem

Tristramite Classification

Dana Class:

40.4.7.6 (40)Hydrated Phosphates, etc

(40.4)where A+++ XO4 · x(H2O)

(40.4.7)Dana Group

40.4.7.1 Rhabdophane-(Ce) (Ce,La)PO4·(H2O) P 6₂22 6 2 2

40.4.7.2 Rhabdophane-(La) (La,Ce)PO4·(H2O) P 6₂22 6 2 2

40.4.7.3 Rhabdophane-(Nd) (Nd,Ce,La)PO4·(H2O) P 6₂22 6 2 2

40.4.7.4 Grayite (Th,Pb,Ca)PO4·(H2O) P 6₂22 6 2 2

40.4.7.5 Brockite (Ca,Th,Ce)(PO4)·(H2O) P 6₂22 6 2 2

40.4.7.6 Tristramite (Ca,U,Fe)(PO4,SO4)·2(H2O) P 6₂22 6 2 2

Strunz Class:

VII/C.29-50 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.29 - Rhabdophane group

VII/C.29-10 Rhabdophane-(Ce) (Ce,La)PO4·(H2O) P 6₂22 6 2 2

VII/C.29-20 Rhabdophane-(La) (La,Ce)PO4·(H2O) P 6₂22 6 2 2

VII/C.29-30 Rhabdophane-(Nd) (Nd,Ce,La)PO4·(H2O) P 6₂22 6 2 2

VII/C.29-40 Brockite (Ca,Th,Ce)(PO4)·(H2O) P 6₂22 6 2 2

VII/C.29-50 Tristramite (Ca,U,Fe)(PO4,SO4)·2(H2O) P 6₂22 6 2 2

VII/C.29-60 Grayite (Th,Pb,Ca)PO4·(H2O) P 6₂22 6 2 2

VII/C.29-70 Ningyoite (U,Ca,Ce)2(PO4)2·1-2(H2O) P 222 2 2 2

Other Tristramite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Tristramite

(Ca,U++++,Fe+++)(PO4,SO4)·2(H2O)
Dana No: 40.4.7.6 Strunz No: VII/C.29-50
Locality:

Notes: