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Hexahydroborite

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Solongo B deposit, Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia
© Thomas Witzke




Formula:
Ca[B(OH)
 
4
]
 
2
 · 6H
 
2
O
System:MonoclinicColour:Clear
Hardness:2½
This page provides mineralogical data about Hexahydroborite.

Classification of Hexahydroborite

IMA status:Approved 1977
Strunz 8th edition ID:5/G.10-20
Nickel-Strunz 10th (pending) edition ID:6.AC.25

6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
Dana 8th edition ID:26.1.4.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
1 : Monoborates
Hey's CIM Ref.:9.3.16

9 : Borates
3 : Borates of Ca and Sr
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Type Occurrence of Hexahydroborite

Type Locality:Solongo B deposit, Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia
General Appearance of Type Material:Flattened colorless prismatic crystals to 0.5 mm
Year of Discovery:1976
Associated Minerals at type locality:
Pentahydroborite

Physical Properties of Hexahydroborite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Clear
Hardness (Mohs):2½
Density (measured):1.84 g/cm3

Crystallography of Hexahydroborite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Cell Parameters:a = 8Å, b = 6.64Å, c = 8.01Å
β = 104.21°
Ratio:a:b:c = 1.205 : 1 : 1.206
Unit Cell Volume:V 412.47 ų (Calculated from Unit Cell)
Comment:A axis may be 16.011 (Fuka)

Optical Data of Hexahydroborite

Type:Biaxial (+)
RI values: nα = 1.498 nβ = 1.503 nγ = 1.510
2V:Measured: 83° , Calculated: 82°
Maximum Birefringence:δ = 0.012

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

Chemical Properties of Hexahydroborite

Formula:
Ca[B(OH)
 
4
]
 
2
 · 6H
 
2
O
Essential elements:B, Ca, H, O
All elements listed in formula:B, Ca, H, O

Relationship of Hexahydroborite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.AC.05Sinhalite
MgAl(BO
 
4
)
6.AC.10Pseudosinhalite
Mg
 
2
Al
 
3
(BO
 
3
)
 
2
(OH)O
 
3
6.AC.15Behierite
(Ta
5+
 
,Nb
5+
 
)(BO
 
4
)
6.AC.15Schiavinatoite
(Nb,Ta)(BO
 
4
)
6.AC.20Frolovite
Ca[B(OH)
 
4
]
 
2
6.AC.30Henmilite
Ca
 
2
Cu[B(OH)
 
4
]
 
2
(OH)
 
4
6.AC.35Bandylite
Cu[B(OH)
 
4
]Cl
6.AC.40Teepleite
Na
 
2
[B(OH)
 
4
]Cl
6.AC.45Moydite-(Y)
Y[B(OH)
 
4
](CO
 
3
)
6.AC.50Carboborite
Ca
 
2
Mg[B(OH)
 
4
]
 
2
(CO
 
3
)
 
2
 · 4H
 
2
O
6.AC.55Sulfoborite
Mg
 
3
[B(OH)
 
4
]
 
2
(SO
 
4
)(OH,F)
 
2
6.AC.60Lüneburgite
Mg
 
3
[B
 
2
(OH)
 
6
](PO
 
4
)
 
2
 · 6H
 
2
O
6.AC.65Seamanite
Mn
2+
3
[B(OH)
 
4
](PO
 
4
)(OH)
 
2
6.AC.70Cahnite
Ca
 
2
[B(OH)
 
4
](AsO
 
4
)
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(B
 
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
9.3.17Meyerhofferite
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
9.3.26Strontioborite
SrB
 
8
O
 
11
(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 Hexahydroborite

Synonyms:
IMA1977-015
Other Languages:
German:Hexahydroborit
Russian:Гексагидроборит
Spanish:Hexahydroborita

Other Information

Other Information:Easily soluble in dilute HCl, slowly soluble in water (room temperature).
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 Hexahydroborite

Reference List:

- +
American Mineralogist (1978): 63: 1283.

Soviet Physics – Doklady: 21: 314-316.

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

Isao Kusachi, et al (1999) Hexahydroborite from Fuka, Okayama Prefecture, Japan. Mineralogical Journal Vol. 21 (1999) , No. 1 pp9-14

Internet Links for Hexahydroborite

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  • Raman and XRD data at RRUFF project
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  • Hexahydroborite details from Handbook of Mineralogy (PDF)
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    • Localities for Hexahydroborite

    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.
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Okayama Prefecture
          • Takahashi City
            • Bitchu-cho (Bicchu-cho)
    		Mineralogical Journal Vol. 21 (1999) , No. 1 pp9-14
    Russia
     
    • Eastern-Siberian Region
      • Transbaikalia (Zabaykalye)
        • Buriatia (Buryatia) Republic
          • Vitim Plateau
    		M.A. Simonov et al.: ZVMO 106:691-697 (1977); Amer. Mineral. 63:1283 (1978); American Mineralogist, Volume 87, pages 1509–1513, 2002; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. 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. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 19th Jun 2011 03:06:54
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