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Metahaiweeite Mineral Data

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General Metahaiweeite Information

Help on Chemical  Formula: Chemical Formula: Ca(UO2)2Si6O15•n(H2O), n<5
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca(UO2)2Si6O15•2.5(H2O)
Help on IMA Status: IMA Status: Approved IMA 1959
Help on Locality: Locality: Haiwee Reservoir, Inyo County, California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Dehydration product of haiweeite.
Help on Name Pronunciation: Name Pronunciation: Metahaiweeite + Pronunciation Say METAHAIWEEITE

Metahaiweeite Image

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  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

Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/c ?
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.98(1), 5.85(0.5), 8.81(0.5),

Physical Properties of Metahaiweeite

Help on Cleavage: Cleavage: {100} Distinct
Help on Color: Color: Greenish yellow, Light yellow.
Help on Density: Density: 3.35
Help on Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Fluorescent, Short UV=dull green, Long UV=dull green.
Help on Luster: Luster: Pearly
Help on Streak: Streak: white

Optical Properties of Metahaiweeite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.236 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1867,KC= 0.151
Ncalc = 1.51
Help on Optical Data: Optical Data: Biaxial (+), a=1.611, b=1.62, g=1.645, bire=0.0340

Calculated Properties of Metahaiweeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Metahaiweeite =3.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMetahaiweeite =1,162.58 barns/electron
U=PEMetahaiweeite x relectron=3,504.01 barns/cc.
Help on Radioactivity: 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
Curies (Ci)
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

Help on  Dana Class: Dana Class: (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations
  (53.03)with (UO2)
  (53.03.02)Weeksite group Weeksite K2(UO2)2Si6O15•4(H2O) C mmb 2/m 2/m 2/m Haiweeite Ca[(UO2)2Si5O12(OH)2]•3(H2O) C mcm 2/m 2/m 2/m Metahaiweeite Ca(UO2)2Si6O15•n(H2O),n<5 P 2/c ? 2/m Coutinhoite! ThxBa1-2x(H2O)y(UO2)2Si5O13•H2O C mmb 2/m 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Print or Cut-and-Paste your Metahaiweeite Specimen Label here :


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





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