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Haiweeite

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Perus, São Paulo, São Paulo, Southeast Region, Brazil
© O. Dziallas

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Formula:
Ca(UO
 
2
)
 
2
[Si
 
5
O
 
12
(OH)
 
2
]·4.5H
 
2
O
System:MonoclinicColour:Pale yellow, ...
Lustre:PearlyHardness:3½
This page provides mineralogical data about Haiweeite.

Classification of Haiweeite

IMA status:Approved
Strunz 8th edition ID:8/B.37-20
Nickel-Strunz 10th (pending) edition ID:9.AK.25

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
Dana 8th edition ID:53.3.2.2

53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
3 : Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
Hey's CIM Ref.:14.16.12

14 : Silicates not Containing Aluminum
16 : Silicates of U
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Type Occurrence of Haiweeite

Type Locality:Haiwee Reservoir, Coso District (New Coso District), Coso Mts, Inyo Co., California, USA
Year of Discovery:1959

Physical Properties of Haiweeite

Lustre:Pearly
Colour:Pale yellow, greenish-yellow
Streak:White
Hardness (Mohs):3½

Crystallography of Haiweeite

Crystal System:Monoclinic
Cell Parameters:a = 15.4Å, b = 7.05Å, c = 7.1Å
β = 107.52°
Ratio:a:b:c = 2.184 : 1 : 1.007
Unit Cell Volume:V 735.09 ų (Calculated from Unit Cell)

Optical Data of Haiweeite

Type:Biaxial (-)
RI values: nα = 1.560 - 1.571 nβ = 1.575 - 1.580 nγ = 1.578 - 1.582
2V:Measured: 15° , Calculated: 46° to 50°
Maximum Birefringence:δ = 0.018

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:r > v strong

Chemical Properties of Haiweeite

Formula:
Ca(UO
 
2
)
 
2
[Si
 
5
O
 
12
(OH)
 
2
]·4.5H
 
2
O
Essential elements:Ca, H, O, Si, U
All elements listed in formula:Ca, H, O, Si, U

Relationship of Haiweeite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AK.05Soddyite
(UO
 
2
)
 
2
SiO
 
4
·2H
 
2
O
9.AK.10Cuprosklodowskite
Cu(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 6H
 
2
O
9.AK.10Oursinite
(Co,Mg)(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 6H
 
2
O
9.AK.10Sklodowskite
Mg(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 5H
 
2
O
9.AK.15Boltwoodite
(K,Na)(UO
 
2
)[HSiO
 
4
] · 0.5H
 
2
O
9.AK.15Kasolite
Pb(UO
 
2
)[SiO
 
4
] · H
 
2
O
9.AK.15Natroboltwoodite
(H
 
3
O)(Na,K)UO
 
2
SiO
 
4
·H
 
2
O
9.AK.15Uranophane
Ca(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 5H
 
2
O
9.AK.15Beta-Uranophane
9.AK.20Swamboite
UH
 
6
(UO
 
2
)
 
6
(SiO
 
4
)
 
6
·30H
 
2
O
9.AK.25Metahaiweeite
Ca(UO
 
2
)
 
2
Si
 
6
O
 
15
·nH
 
2
O
9.AK.25Ranquilite
9.AK.30Weeksite
K
 
2
(UO
 
2
)
 
2
(Si
 
2
O
 
5
)
 
3
·4H
 
2
O
9.AK.30Coutinhoite
Th
 
x
Ba
 
(1-2x)
(UO
 
2
)
 
2
Si
 
5
O
 
13
·(H
 
2
O)
 
1+y
 (0 < x < 0.5 and 0 < y < (2+x))
9.AK.35Ursilite
(Mg,Ca)
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5.5
(OH)
 
5
·13H
 
2
O
9.AK.35Magnioursilite
Mg
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5
(OH)
 
6
·20H
 
2
O
9.AK.35Calcioursilite
Ca
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5
(OH)
 
6
·15H
 
2
O
9.AK.40Uranosilite
UO
 
3
 · 7SiO
 
2
Related Minerals - Hey's Index Grouping:

- +
14.16.1Uranosilite
UO
 
3
 · 7SiO
 
2
14.16.2Coffinite
(U,Th)[(OH)
 
4x
|(SiO
 
4
)
 
1-x
]
14.16.3Soddyite
(UO
 
2
)
 
2
SiO
 
4
·2H
 
2
O
14.16.4Swamboite
UH
 
6
(UO
 
2
)
 
6
(SiO
 
4
)
 
6
·30H
 
2
O
14.16.5Weeksite
K
 
2
(UO
 
2
)
 
2
(Si
 
2
O
 
5
)
 
3
·4H
 
2
O
14.16.6Boltwoodite
(K,Na)(UO
 
2
)[HSiO
 
4
] · 0.5H
 
2
O
14.16.7Natroboltwoodite
(H
 
3
O)(Na,K)UO
 
2
SiO
 
4
·H
 
2
O
14.16.8Cuprosklodowskite
Cu(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 6H
 
2
O
14.16.9Sklodowskite
Mg(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 5H
 
2
O
14.16.10Uranophane
Ca(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 5H
 
2
O
14.16.11β-Uranophane
Ca(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 5H
 
2
O
14.16.13Metahaiweeite
Ca(UO
 
2
)
 
2
Si
 
6
O
 
15
·nH
 
2
O
14.16.14Thorogummite
(Th,U)[(OH)
 
4x
|(SiO
 
4
)
 
1-x
]
14.16.15Steacyite
([ ],K)(Na,Ca)
 
2
(Th,U)[Si
 
8
O
 
20
]
14.16.16Ekanite
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
14.16.17Kasolite
Pb(UO
 
2
)[SiO
 
4
] · H
 
2
O
14.16.18 Orlite
Pb
 
3
(UO
 
2
)
 
3
(Si
 
2
O
 
7
)
 
2
·6H
 
2
O
14.16.19Oursinite
(Co,Mg)(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 6H
 
2
O

Other Names for Haiweeite

Synonyms:
GastuniteRanquilite
Other Languages:
German:Haiweeit
Ranquilit
Spanish:Haiweeita
Ranquilita

Other Information

Health Warning:Contains uranium. Wash hands after handling. Do not lick or ingest. Store in uninhabited areas.

References for Haiweeite

Reference List:McBurney, T.C. & J. Murdoch (1959), Haiweeite, a new uranium mineral from California: American Mineralogist: 44: 839-843.

Burns, P.C. (2001b) A new uranyl silicate sheet in the structure of haiweeite and comparison to other uranyl silicates. Canadian Mineralogist: 39: 1153-1160.

Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for Haiweeite

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    Localities for Haiweeite

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