Schmitterite Mineral Data

Schmitterite Mineral Data +

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General Schmitterite Information

Chemical Formula:

(UO2)TeO3

Composition:

Molecular Weight = 445.63 gm

Uranium 53.41 % U 60.60 % UO₂

Tellurium 28.63 % Te 35.81 % TeO₂

Oxygen 17.95 % O

______ ______

100.00 % 96.41 % = TOTAL OXIDE

Empirical Formula:

(UO₂)(TeO₃)

Environment:

Secondary mineral in the oxidized portions of a telluride-bearing deposit.

IMA Status:

Approved IMA 1971

Locality:

Moctezuma mine ("La Bamolla"), Moctezuma, Sonora, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for Eduardo Schmitter Villada (1904-1982), professor of mineralogy, Universidad Nacional Autonoma de Mexico.

Synonym:

ICSD 2553

PDF 25-1001

Schmitterite Image

Images:

Click Here for Larger Schmitterite Image

Schmitterite Emmonsite

Comments: Yellow schmitterite with green emmonsite.
Location: Moctezuma, Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Schmitterite Crystallography

Axial Ratios:

a:b:c =0.779:1:0.532

Cell Dimensions:

a = 7.86, b = 10.089, c = 5.368, Z = 4; V = 425.68 Den(Calc)= 6.95

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmab

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

By Intensity(I/I_o): 3.682(1), 3.099(0.9), 5.35(0.9),

Physical Properties of Schmitterite

Cleavage:

[100] Good

Color:

Colorless, Light yellow.

Density:

6.878

Diaphaniety:

Transparent

Hardness:

1 - Talc

Luster:

Pearly

Streak:

white

Optical Properties of Schmitterite

Optical Data:

NCalc= 1.92 - from Gladstone-Dale relationship (KC = 0.1326) where Ncalc=Dcalc*KC+1
NCalc= 1.91 - from Gladstone-Dale relationship (KC = 0.1326) where Ncalc=Dmeas*KC+1

Calculated Properties of Schmitterite

Electron Density:

r_electron=5.74 gm/cc
note: r_Schmitterite=6.95 gm/cc.

Fermion Index

Fermion Index = 0.02681
Boson Index = 0.97319

Photoelectric:

PE_Schmitterite=1,573.84 barns/electron
U=PE_Schmitterite x r_electron=9,032.80 barns/cc.

Radioactivity:

GRapi = 3,759,848.39 (Gamma Ray American Petroleum Institute Units)

Schmitterite 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) 8.09 ± 2.02 grams of pure Schmitterite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 808.99 ±202.25 grams of pure Schmitterite .

**Estimated Radioactivity from Schmitterite** - 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 / 6.50 cm	95,611,973	2.58E-03	3,759,848.39	1,236.11
100 gm / 3.02 cm	9,561,197	2.58E-04	375,984.84	123.61
10 gm / 1.40 cm	956,120	2.58E-05	37,598.48	12.36
1 gm / 6.50 mm	95,612	2.58E-06	3,759.85	1.24
0.1 gm / 3.02 mm	9,561	2.58E-07	375.98	0.12
0.01 gm / 1.40 mm	956	2.58E-08	37.60	0.01
0.001 gm / 0.65 mm	96	2.58E-09	3.76	0.00

Weight of pure Schmitterite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.95 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

Schmitterite Classification

Dana Class:

34.1.6.1 (34)Selenites - Tellurites - Sulfites

(34.1)as A++ XO3

(34.1.6)Dana Group

34.1.6.1 Schmitterite (UO2)TeO3 Pmab 2/m 2/m 2/m

Strunz Class:

IV/K.03-10 IV - Oxides

IV/K - Sulfides, selenides, tellurides with [XO3]2- groups and related structures

IV/K.03 - Schmitterite - Moctezumite series

IV/K.03-10 Schmitterite (UO2)TeO3 Pmab 2/m 2/m 2/m

IV/K.03-20 Moctezumite Pb(UO2)(TeO3)2 P 2₁/c 2/m

Other Schmitterite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

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Schmitterite

(UO2)TeO3
Dana No: 34.1.6.1 Strunz No: IV/K.03-10
Locality:

Notes: