Metahaiweeite Mineral Data

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General Metahaiweeite Information

Chemical Formula:

Ca(UO2)2Si6O15•n(H2O), n<5

Composition:

Molecular Weight = 1,033.68 gm

Calcium 3.88 % Ca 5.43 % CaO

Uranium 46.05 % U 52.25 % UO₂

Silicon 16.30 % Si 34.88 % SiO₂

Hydrogen 0.49 % H 4.36 % H₂O

Oxygen 33.28 % O

______ ______

100.00 % 96.90 % = TOTAL OXIDE

Empirical Formula:

Ca(UO₂)₂Si₆O₁₅•2.5(H₂O)

IMA Status:

Approved IMA 1959

Locality:

Haiwee Reservoir, Inyo County, California, USA. Link to MinDat.org Location Data.

Name Origin:

Dehydration product of haiweeite.

Name Pronunciation:

Metahaiweeite + Pronunciation

Metahaiweeite Image

Images:

Click Here for Larger Metahaiweeite Image

Metahaiweeite Haiweeite

Comments: Pale yellow scaly metahaiweeite coating on quartz with minute haiweeite acicular crystals.
Location: Coso Uranium Mine, Inyo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metahaiweeite Crystallography

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/c ?

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

By Intensity(I/I_o): 6.98(1), 5.85(0.5), 8.81(0.5),

Physical Properties of Metahaiweeite

Cleavage:

{100} Distinct

Color:

Greenish yellow, Light yellow.

Density:

3.35

Diaphaneity:

Translucent

Hardness:

3.5 - Copper Penny

Luminescence:

Fluorescent, Short UV=dull green, Long UV=dull green.

Luster:

Pearly

Streak:

white

Optical Properties of Metahaiweeite

Gladstone-Dale:

CI meas= -0.236 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1867,KC= 0.151
Ncalc = 1.51

Optical Data:

Biaxial (+), a=1.611, b=1.62, g=1.645, bire=0.0340

Calculated Properties of Metahaiweeite

Electron Density:

Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Metahaiweeite =3.35 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Metahaiweeite}=1,162.58 barns/electron
U=PE_{Metahaiweeite} x r_electron=3,504.01 barns/cc.

Radioactivity:

GRapi = 3,531,895.47 (Gamma Ray American Petroleum Institute Units)
Concentration of Metahaiweeite per GRapi unit = 283.13 (PPB)

Metahaiweeite 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) 8.61 ± 2.15 grams of pure Metahaiweeite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 861.20 ±215.30 grams of pure Metahaiweeite .

**Estimated Radioactivity from Metahaiweeite** - 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 / 8.29 cm	82,438,191	2.23E-03	3,531,895.47	1,161.17
100 gm / 3.85 cm	8,243,819	2.23E-04	353,189.55	116.12
10 gm / 1.79 cm	824,382	2.23E-05	35,318.95	11.61
1 gm / 8.29 mm	82,438	2.23E-06	3,531.90	1.16
0.1 gm / 3.85 mm	8,244	2.23E-07	353.19	0.12
0.01 gm / 1.79 mm	824	2.23E-08	35.32	0.01
0.001 gm / 0.83 mm	82	2.23E-09	3.53	0.00

Weight of pure Metahaiweeite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.35 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

Metahaiweeite Classification

Dana Class:

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

(53.03)with (UO2)

(53.03.02)Weeksite group

53.03.02.01 Weeksite K2(UO2)2Si6O15•4(H2O) C mmb 2/m 2/m 2/m

53.03.02.02 Haiweeite Ca[(UO2)2Si5O12(OH)2]•3(H2O) C mcm 2/m 2/m 2/m

53.03.02.03 Metahaiweeite Ca(UO2)2Si6O15•n(H2O),n<5 P 2/c ? 2/m

53.03.02.04 Coutinhoite! ThxBa1-2x(H2O)y(UO2)2Si5O13•H2O C mmb 2/m 2/m 2/m

Strunz Class:

09.AK.25 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AK -Uranyl neso- and polysilicates

09.AK.25 Haiweeite Ca[(UO2)2Si5O12(OH)2]•3(H2O) C mcm 2/m 2/m 2/m

09.AK.25 Metahaiweeite Ca(UO2)2Si6O15•n(H2O),n<5 P 2/c ? 2/m

Other Metahaiweeite Information

References:

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

See Also:

Links to other databases for Metahaiweeite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Metahaiweeite

Ca(UO2)2Si6O15•n(H2O), n<5
Dana No: 53.03.02.03 Strunz No: 09.AK.25
Locality:

Notes: