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Strontioborite

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Formula:
SrB
 
8
O
 
11
(OH)
 
4
System:MonoclinicColour:Colourless
Name:The name reflects its composition : a strontium borate.


Originally reported from Chelkar salt dome, Aksai Valley, Aqtöbe Oblysy (Aktubinsk [Aktyubinsk; Aktubinskaya] Oblast'), Kazakhstan.

Classification of Strontioborite

IMA status:Discredited
Strunz 8th edition ID:5/K.07-30
Nickel-Strunz 10th (pending) edition ID:6.FC.10

6 : BORATES
F : Hexaborates
C : Phyllo-hexaborates
Dana 8th edition ID:25.6.3.1

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
Hey's CIM Ref.:9.3.26

9 : Borates
3 : Borates of Ca and Sr
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Physical Properties of Strontioborite

Diaphaneity (Transparency):Transparent
Colour:Colourless
Tenacity:Very brittle

Crystallography of Strontioborite

Crystal System:Monoclinic
Cell Parameters:a = 9.83Å, b = 8.22Å, c = 7.55Å
β = 107.77°
Ratio:a:b:c = 1.196 : 1 : 0.918
Unit Cell Volume:V 580.95 ų (Calculated from Unit Cell)

Optical Data of Strontioborite

Type:Biaxial (+/-)
RI values: nα = 1.470 nβ = 1.510 nγ = 1.579
2V:Measured: 85° , Calculated: 78°
Maximum Birefringence:δ = 0.109

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

Chemical Properties of Strontioborite

Formula:
SrB
 
8
O
 
11
(OH)
 
4
Simplified for copy/paste:SrB8O11(OH)4
Essential elements:B, H, O, Sr
All elements listed in formula:B, H, O, Sr

Relationship of Strontioborite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.FC.05Tunellite
SrB
 
6
O
 
9
(OH)
 
2
· 3H
 
2
O
6.FC.05Nobleite
CaB
 
6
O
 
9
(OH)
 
2
· 3H
 
2
O
6.FC.15Ginorite
Ca
 
2
B
 
14
O
 
23
· 8H
 
2
O
6.FC.15Strontioginorite
(Sr,Ca)
 
2
B
 
14
O
 
23
· 8H
 
2
O
6.FC.20Fabianite
CaB
 
3
O
 
5
OH
Related Minerals - Hey's Index Grouping:

- +
9.3.1Calciborite
Ca(B
 
2
O
 
4
)
9.3.2Sibirskite
Ca
 
2
(HB
 
2
O
 
5
)(OH)
9.3.3Fabianite
CaB
 
3
O
 
5
OH
9.3.4Uralborite
Ca
 
2
[B
 
3
O
 
3
(OH)
 
5
· OB(OH)
 
3
]
9.3.5Vimsite
CaB
 
2
O
 
2
(OH)
 
4
9.3.6Olshanskyite
Ca
 
3
[B(OH)
 
4
]
 
4
(OH)
 
2
9.3.7Frolovite
Ca[B(OH)
 
4
]
 
2
9.3.8Korzhinskite
Ca(B
 
2
O
 
4
) · H
 
2
O
9.3.9Tyretskite
Ca
 
2
B
 
5
O
 
9
OH · H
 
2
O
9.3.10Nifontovite
Ca
 
3
B
 
6
O
 
6
(OH)
 
12
(H
 
2
O)
 
2
9.3.12Inyoite
Ca(H
 
4
B
 
3
O
 
7
)(OH) · 4H
 
2
O
9.3.13Gowerite
Ca[B
 
5
O
 
8
(OH)][B(OH)
 
3
] · 3H
 
2
O
9.3.14Colemanite
Ca[B
 
3
O
 
4
(OH)
 
3
] · H
 
2
O
9.3.15Pentahydroborite
CaB
 
2
O(OH)
 
6
· 2H
 
2
O
9.3.16Hexahydroborite
Ca[B(OH)
 
4
]
 
2
· 6H
 
2
O
9.3.17Meyerhofferite
Ca
 
2
(H
 
3
B
 
3
O
 
7
)
 
2
· 4H
 
2
O
9.3.18Priceite
Ca
 
2
B
 
5
O
 
7
(OH)
 
5
· H
 
2
O
9.3.19Ginorite
Ca
 
2
B
 
14
O
 
23
· 8H
 
2
O
9.3.20Probertite
NaCaB
 
5
O
 
7
(OH)
 
4
· 3H
 
2
O
9.3.21Ulexite
NaCa[B
 
5
O
 
6
(OH)
 
6
] · 5H
 
2
O
9.3.22Hydroboracite
CaMg[B
 
3
O
 
4
(OH)
 
3
]
 
2
· 3H
 
2
O
9.3.23Inderborite
CaMg(H
 
3
B
 
3
O
 
7
)
 
2
· 8H
 
2
O
9.3.24Wardsmithite
Ca
 
5
Mg[B
 
4
O
 
7
]
 
6
· 30H
 
2
O
9.3.25Henmilite
Ca
 
2
Cu[B(OH)
 
4
]
 
2
(OH)
 
4
9.3.27Veatchite
Sr
 
2
B
 
11
O
 
16
(OH)
 
5
· H
 
2
O
9.3.28Veatchite-A
Sr
 
2
B
 
11
O
 
16
(OH)
 
5
· H
 
2
O
9.3.29 P-Veatchite
9.3.30 Balavinskite
Sr
 
2
B
 
6
O
 
11
· 4H
 
2
O
9.3.31Tunellite
SrB
 
6
O
 
9
(OH)
 
2
· 3H
 
2
O
9.3.32Strontioginorite
(Sr,Ca)
 
2
B
 
14
O
 
23
· 8H
 
2
O

Other Names for Strontioborite

Other Languages:
German:Strontioborit
Russian:Стронциоборит
Spanish:Strontioborita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Strontioborite

Reference List:

- +
Doklady Akademii Nauk SSSR (1960): 135: 173.

American Mineralogist (1961): 46: 768.

American Mineralogist (1965): 50: 1508.

Soviet Physics – Crystallography: 20: 563-566.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Strontioborite

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  • Localities for Strontioborite

    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.
    (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
     
    • Aktobe Province (Aqtöbe Oblysy; Aktubinskaya Oblast')
      • Aksai Valley
    Handbook of Mineralogy Vol V p 6; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
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