Metahaiweeite
A valid IMA mineral species
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Formula:
Ca(UO2)2Si6O15 · nH2O
Colour:
pale yellow to greenish yellow
Lustre:
Pearly
Hardness:
3½
Specific Gravity:
3.35
Crystal System:
Monoclinic
Name:
The name indicates a dehydrated state (meta) of haiweeite. The root name is for the Haiwee Reservoir, California, located near the type locality.
Type Locality:
This page provides mineralogical data about Metahaiweeite.
Unique Identifiers
Mindat ID:
2663
Long-form identifier:
mindat:1:1:2663:1
GUID
(UUID V4):
(UUID V4):
45803c7d-f796-4899-a972-5337abf9cc70
IMA Classification of Metahaiweeite
Approved
Approval year:
1959
First published:
1959
Classification of Metahaiweeite
9.AK.25
9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
53.3.2.3
53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
3 : Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
3 : Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
14.16.13
14 : Silicates not Containing Aluminum
16 : Silicates of U
14 : Silicates not Containing Aluminum
16 : Silicates of U
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mhwe | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Metahaiweeite
Pearly
Colour:
pale yellow to greenish yellow
Hardness:
3½ on Mohs scale
Cleavage:
Distinct/Good
{100}
{100}
Density:
3.35 g/cm3 (Measured)
Optical Data of Metahaiweeite
Type:
Biaxial (+)
RI values:
nα = 1.611 nβ = 1.620 nγ = 1.645
Max Birefringence:
δ = 0.034
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong
Chemistry of Metahaiweeite
Mindat Formula:
Ca(UO2)2Si6O15 · nH2O
Crystallography of Metahaiweeite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/c
Cell Parameters:
a = 15.4 Å, b = 7.05 Å, c = 7.10 Å
β = 107.87°
β = 107.87°
Ratio:
a:b:c = 2.184 : 1 : 1.007
Unit Cell V:
733.66 ų (Calculated from Unit Cell)
Comment:
Questionable
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.81 Å | (50) |
| 6.98 Å | (100) |
| 5.85 Å | (50) |
| 4.54 Å | (40) |
| 3.52 Å | (50) |
| 3.28 Å | (40) |
| 3.16 Å | (50) |
| 3.00 Å | (30) |
| 2.90 Å | (30) |
Comments:
Haiwee Reservoir, California, USA. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47f : [Uranyl (U⁶⁺) minerals] |
Type Occurrence of Metahaiweeite
General Appearance of Type Material:
The centers of spherulitic aggregates.
Place of Conservation of Type Material:
No designated type specimen.
Geological Setting of Type Material:
Fracture surfaces in granite.
Associated Minerals at Type Locality:
Reference:
McBurney, T.C. and Murdoch, J. (1959) Haiweeite, a new uranium mineral from California. American Mineralogist: 44: 839-843.
Other Language Names for Metahaiweeite
German:Meta-haiweeit
Related Minerals - Strunz-mindat Grouping
| 9.AK. | Orlite | Pb3(UO2)3(Si2O7)2 · 6H2O |
| 9.AK.05 | Soddyite | (UO2)2SiO4 · 2H2O |
| 9.AK.10 | Cuprosklodowskite | Cu(UO2)2(SiO3OH)2 · 6H2O |
| 9.AK.10 | Oursinite | Co(UO2)2(SiO3OH)2 · 6H2O |
| 9.AK.10 | Sklodowskite | Mg(UO2)2(SiO3OH)2 · 6H2O |
| 9.AK.15 | Boltwoodite | (K,Na)(UO2)(SiO3OH) · 1.5H2O |
| 9.AK.15 | Kasolite | Pb(UO2)(SiO4) · H2O |
| 9.AK.15 | Natroboltwoodite | Na(UO2)(SiO3OH) · H2O |
| 9.AK.15 | Parauranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| 9.AK.15 | Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| 9.AK.20 | Swamboite-(Nd) | Nd0.333[(UO2)(SiO3OH)](H2O)~2.5 |
| 9.AK.25 | Haiweeite | Ca(UO2)2[Si5O12(OH)2] · 6H2O |
| 9.AK.30 | Weeksite | K2(UO2)2(Si5O13) · 4H2O |
| 9.AK.30 | Coutinhoite | ThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x)) |
| 9.AK.35 | Magnioursilite | Mg4(UO2)4(Si2O5)5(OH)6 · 20H2O |
| 9.AK.35 | Calcioursilite | Ca4(UO2)4(Si2O5)5(OH)6 · 15H2O |
| 9.AK.40 | Uranosilite | UO3 · 7SiO2 |
Fluorescence of Metahaiweeite
fluorescing weakly to dull green
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Metahaiweeite
mindat.org URL:
https://www.mindat.org/min-2663.html
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References for Metahaiweeite
Localities for Metahaiweeite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Namibia | |
| |
USA (TL) | |
|
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Coso Mining District, Inyo County, California, USA