Umbozerite Mineral Data

Umbozerite Mineral Data +

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General Umbozerite Information

Chemical Formula:

Na3Sr4ThSi8(O,OH)24

Composition:

Molecular Weight = 1,266.20 gm

Sodium 5.45 % Na 7.34 % Na₂O

Strontium 27.68 % Sr 32.73 % SrO

Thorium 18.33 % Th 20.85 % ThO₂

Silicon 17.74 % Si 37.96 % SiO₂

Hydrogen 0.48 % H 4.27 % H₂O

Oxygen 30.33 % O

______ ______

100.00 % 103.16 % = TOTAL OXIDE

Empirical Formula:

Na₃Sr₄ThSi₈O₁₈(OH)₆

Environment:

In ussingite veinlets cutting alkalic rocks.

IMA Status:

Approved IMA 1974

Locality:

Umbozero (Lake Umba), Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Umbozerite Image

Images:

Umbozerite

Comments: Dark brown prismatic umbozerite masses in pegmatite rock.
Location: Pegmatite #100, Mount Karnasurt, Lovozero Massif, Kola Peninsula, Murmansk District,. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Umbozerite Crystallography

Crystal System:

Amorphous- No Crystals

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

By Intensity(I/I_o): 3.29(1), 1.701(0.8), 3.38(0.6),

Physical Properties of Umbozerite

Cleavage:

None

Color:

Bottle green, Greenish brown.

Density:

3.6

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Habit:

Pseudo Tetragonal - Crystals show a tetragonal shape.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Optical Properties of Umbozerite

Gladstone-Dale:

CI meas= 0.063 (Fair) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1778,KC= 0.1897

Optical Data:

Isotropic, n=1.64.

Calculated Properties of Umbozerite

Electron Density:

r_electron=3.33 gm/cc
note: r_Umbozerite=3.60 gm/cc.

Fermion Index

Fermion Index = 0.0278
Boson Index = 0.9722

Photoelectric:

PE_Umbozerite= 449.63 barns/electron
U=PE_Umbozerite x r_electron=1,495.70 barns/cc.

Radioactivity:

GRapi = 361,240.03 (Gamma Ray American Petroleum Institute Units)

Umbozerite 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) 84.20 ± 21.05 grams of pure Umbozerite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 8420.1 ±2105.0 grams of pure Umbozerite .

**Estimated Radioactivity from Umbozerite** - 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 / 8.10 cm	8,209,815	2.22E-04	361,240.03	118.76
100 gm / 3.76 cm	820,982	2.22E-05	36,124.00	11.88
10 gm / 1.74 cm	82,098	2.22E-06	3,612.40	1.19
1 gm / 8.10 mm	8,210	2.22E-07	361.24	0.12
0.1 gm / 3.76 mm	821	2.22E-08	36.12	0.01
0.01 gm / 1.74 mm	82	2.22E-09	3.61	0.00
0.001 gm / 0.81 mm	8	2.22E-10	0.36	0.00

Weight of pure Umbozerite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.60 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

Umbozerite Classification

Dana Class:

78.7.17.1 (78)Unclassified silicates

(78.7)wholly unclassified silicates

(78.7.17)Dana Group

78.7.17.1 Umbozerite Na3Sr4ThSi8(O,OH)24 None

Strunz Class:

VIII/A.10-10 VIII - Silicates

VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral and cubic orientation [8+6]

VIII/A.10 - Umbozerite series

VIII/A.10-10 Umbozerite Na3Sr4ThSi8(O,OH)24 None

Other Umbozerite Information

References:

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

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Umbozerite

Na3Sr4ThSi8(O,OH)24
Dana No: 78.7.17.1 Strunz No: VIII/A.10-10
Locality:

Notes: