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Strontioborite

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
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
[(OH)(B
 
2
O
 
4
(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
[OH|{B(OH)
 
4
}
 
2
]
 
2
9.3.7Frolovite
Ca[B(OH)
 
4
]
 
2
9.3.8Korzhinskite
CaB
 
2
O
 
4
·H
 
2
O
9.3.9Tyretskite
Ca
 
2
B
 
5
O
 
9
OH·H
 
2
O
9.3.10Nifontovite
CaB
 
2
O
 
4
·2.3H
 
2
O
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(OH)
 
4
|[B(OH)
 
4
]
 
2
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

    (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
     
    • Aqtöbe Oblysy (Aktubinsk [Aktyubinsk; 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
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 9th Oct 2009 18:19:16