Haiweeite Mineral Data

Haiweeite Mineral Data +

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General Haiweeite Information

Chemical Formula:

Ca[(UO2)2Si5O12(OH)2]·3(H2O)

Composition:

Molecular Weight = 1,000.61 gm

Calcium 4.01 % Ca 5.60 % CaO

Uranium 47.58 % U 53.97 % UO₂

Silicon 14.03 % Si 30.02 % SiO₂

Hydrogen 0.81 % H 7.20 % H₂O

Oxygen 33.58 % O

______ ______

100.00 % 96.80 % = TOTAL OXIDE

Empirical Formula:

Ca(UO₂)₂Si₅O₁₂(OH)₂·3(H₂O)

Environment:

Secondary, oxidation product.

IMA Status:

Approved IMA 1959

Locality:

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

Name Origin:

Named after it's locality.

Synonym:

ICSD 85085

PDF 22-160

Ranquilite

Haiweeite Image

Images:

Haiweeite

Comments: Minute divergent acicular crystals of white haiweeite on matrix.
Location: Coso Uranium Mine, Inyo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Haiweeite Metahaiweeite

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

Images:

Haiweeite

Comments: Yellow, spherical, aggregates of acicular haiweeite with clear calcite scalenohedrons.
Location: Teofilo Otoni, Minas Gerais, Brazil.. Scale: Picture size 1 cm.
© Paul M. Schumacher

Haiweeite Crystallography

Axial Ratios:

a:b:c =0.3972:1:1.0225

Cell Dimensions:

a = 7.125, b = 17.937, c = 18.342, Z = 4; V = 2,344.13 Den(Calc)= 2.84

Crystal System:

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

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

By Intensity(I/I_o): 9.14(1), 4.42(0.6), 4.556(0.6),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Burns P C , The Canadian Mineralogist , 39 (2001) p.1153-1160, A new uranyl silicate sheet in the structure of haiweeite and comparison to, other uranyl silicates

Physical Properties of Haiweeite

Cleavage:

[001] Good

Color:

Greenish yellow, Light yellow.

Density:

2.86 - 3.35, Average = 3.1

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

3.5 - Copper Penny

Luster:

Pearly

Streak:

white

Optical Properties of Haiweeite

Gladstone-Dale:

CI meas= -0.212 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.325 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2022,KPDmeas= 0.185,KC= 0.1527

Optical Data:

Biaxial (-), a=1.56-1.571, b=1.575-1.58, g=1.578-1.582, bire=0.0110-0.0180, 2V(Calc)=46-50, 2V(Meas)=15. Dispersion r > v strong.

Calculated Properties of Haiweeite

Electron Density:

r_electron=2.79 gm/cc
note: r_Haiweeite=3.11 gm/cc.

Fermion Index

Fermion Index = 0.01019
Boson Index = 0.98981

Photoelectric:

PE_Haiweeite=1,201.22 barns/electron
U=PE_Haiweeite x r_electron=3,354.76 barns/cc.

Radioactivity:

GRapi = 3,647,558.84 (Gamma Ray American Petroleum Institute Units)

Haiweeite 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) 8.34 ± 2.08 grams of pure Haiweeite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 833.89 ±208.47 grams of pure Haiweeite .

**Estimated Radioactivity from Haiweeite** - 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 / 8.50 cm	85,162,025	2.30E-03	3,647,558.84	1,199.20
100 gm / 3.95 cm	8,516,203	2.30E-04	364,755.88	119.92
10 gm / 1.83 cm	851,620	2.30E-05	36,475.59	11.99
1 gm / 8.50 mm	85,162	2.30E-06	3,647.56	1.20
0.1 gm / 3.95 mm	8,516	2.30E-07	364.76	0.12
0.01 gm / 1.83 mm	852	2.30E-08	36.48	0.01
0.001 gm / 0.85 mm	85	2.30E-09	3.65	0.00

Weight of pure Haiweeite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.11 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

Haiweeite Classification

Dana Class:

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

(53.3)with (UO2)

(53.3.2)Weeksite group

53.3.2.1 Weeksite K2(UO2)2Si6O15·4(H2O) C mmb 2/m 2/m 2/m

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

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

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

Strunz Class:

VIII/B.37-20 VIII - Silicates

VIII/B - Nesosub-silicates. "Insel" silicates with anions unfamiliar to tetraheders. Uranyl-"Insel" silicates with [UO2]2+ - [SiO4]4-

VIII/B.37 - Ursilite - Metahaiweeite series

VIII/B.37-10 Ursilite* (Mg,Ca)4[(UO2)4(OH)5/(Si2O5)5.5]·13(H2O) Unk Ortho

VIII/B.37-20 Haiweeite Ca[(UO2)2Si5O12(OH)2]·3(H2O) C mcm 2/m 2/m 2/m

VIII/B.37-30 Metahaiweeite Ca(UO2)2Si6O15·n(H2O),n<5 P 2/c ? 2/m

Other Haiweeite Information

References:

NAME( MinRec) PHYS. PROP.(AmMin, Vol 84, p 197, Vol 87, p768) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Haiweeite

Ca[(UO2)2Si5O12(OH)2]·3(H2O)
Dana No: 53.3.2.2 Strunz No: VIII/B.37-20
Locality:

Notes: