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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
[O
 
3
|OH|(BO
 
3
)
 
2
]
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(OH)
 
4
|[B(OH)
 
4
]
 
2
6.AC.35Bandylite
Cu[Cl|B(OH)
 
4
]
6.AC.40Teepleite
Na
 
2
[Cl|B(OH)
 
4
]
6.AC.45Moydite-(Y)
Y[CO
 
3
|B(OH)
 
4
]
6.AC.50Carboborite
Ca
 
2
Mg[CO
 
3
|B(OH)
 
4
]
 
2
 · 4H
 
2
O
6.AC.55Sulfoborite
Mg
 
3
[(OH,F)
 
2
|SO
 
4
|{B(OH)
 
4
}
 
2
]
6.AC.60Lüneburgite
Mg
 
3
B
 
2
(PO
 
4
)
 
2
(OH)
 
6
·6H
 
2
O
6.AC.65Seamanite
Mn
2+
3
[(OH)
 
2
|PO
 
4
|B(OH)
 
4
]
6.AC.70Cahnite
Ca
 
2
[AsO
 
4
|B(OH)
 
4
]
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
9.3.17Meyerhofferite
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
9.3.26Strontioborite
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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    Localities for Hexahydroborite

    (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
            • 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
    Mineral and/or Locality
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