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Natroboltwoodite

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Big Photo

Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© 2008, JGW




Formula:
(H
 
3
O)(Na,K)UO
 
2
SiO
 
4
 · H
 
2
O
Colour:Light yellow
Name:The name reflects its sodium content and similarity to boltwoodite.


Uranophane Group.

Classification of Natroboltwoodite

IMA status:Approved
Nickel-Strunz 10th (pending) edition ID:9.AK.15

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
Dana 8th edition ID:53.3.1.6

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.:14.16.7

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

Type Locality:Kyzylsai Mo-U deposit, Chu-Ili Mts, Almaty Province (Almaty Oblysy; Almati Oblast'), Kazakhstan

Physical Properties of Natroboltwoodite

Lustre:Dull
Colour:Light yellow

Optical Data of Natroboltwoodite

Type:Biaxial (-)
RI values: nα = 1.692 nγ = 1.659
Maximum Birefringence:δ = 0.033

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:weak to distinct

Chemical Properties of Natroboltwoodite

Formula:
(H
 
3
O)(Na,K)UO
 
2
SiO
 
4
 · H
 
2
O
Essential elements:H, Na, O, Si, U
All elements listed in formula:H, K, Na, O, Si, U

Relationship of Natroboltwoodite to other Species

Structurally related to group(s):
Uranophane Group
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.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.25Haiweeite
Ca(UO
 
2
)
 
2
[Si
 
5
O
 
12
(OH)
 
2
] · 4.5H
 
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
4+
 
,Th)(SiO
 
4
)
 
1-x
(OH)
 
4x
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
14.16.8Cuprosklodowskite
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
14.16.12Haiweeite
Ca(UO
 
2
)
 
2
[Si
 
5
O
 
12
(OH)
 
2
] · 4.5H
 
2
O
14.16.13Metahaiweeite
Ca(UO
 
2
)
 
2
Si
 
6
O
 
15
 · nH
 
2
O
14.16.14Thorogummite
(Th,U)(SiO
 
4
)
 
1-x
(OH)
 
4-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 Natroboltwoodite

Synonyms:
Na BoltwooditeSodium-Boltwoodite
Other Languages:
German:Na Boltwoodit
Natriumboltwoodit

Other Information

Health Warning:Contains uranium - always wash hands after handling. Avoid inhaling dust when handling or breaking. Never lick or ingest. Avoid prolonged exposure in proximity of the body. Store away from inhabited areas.

References for Natroboltwoodite

Reference List:

- +
Chernikov A.A. et al. (1975), Doklady Akademii Nauk SSSR: 221: 195.

American Mineralogist (1976): 61: 1054-1055.

Canadian Mineralogist (1997): 35: 3.

Burns, P.C. (1998) The structure of boltwoodite and implications of solid-solution towards sodium boltwoodite. Canadian Mineralogist: 36: 1069-1075.

Internet Links for Natroboltwoodite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Sodium-Boltwoodite details from Handbook of Mineralogy (PDF)
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    • Localities for Natroboltwoodite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Kazakhstan
     
    • Almaty Province (Almaty Oblysy; Almati Oblast')
      • Chu-Ili Mts
    		DAN-SSSR, ser. Geol. (1975) 221, 1, 195-; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    		www.koeln.netsurf.de/~w.steffens/lovo.htm
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