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Hexahydroborite

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Formula:
Ca[B(OH)4]2 · 2H2O or CaB2O4 · 6H2O
Colour:
Clear
Lustre:
Vitreous
Hardness:
Specific Gravity:
1.84
Crystal System:
Monoclinic
Name:
Named for the composition, originally thought to contain six water molecules, but later found by crystal-structure analysis to be incorrect.
This page provides mineralogical data about Hexahydroborite.


Hide all sections | Show all sections

Classification of HexahydroboriteHide

Approved
Approval Year:
1977
6.AC.25

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

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
1 : Monoborates
9.3.16

9 : Borates
3 : Borates of Ca and Sr

Physical Properties of HexahydroboriteHide

Vitreous
Transparency:
Transparent
Colour:
Clear
Hardness:
2½ on Mohs scale
Density:
1.84 g/cm3 (Measured)    

Optical Data of HexahydroboriteHide

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

Formula:
Ca[B(OH)4]2 · 2H2O or CaB2O4 · 6H2O
IMA Formula:
Ca[B(OH)4]2 · 2H2O

Crystallography of HexahydroboriteHide

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

Type Occurrence of HexahydroboriteHide

General Appearance of Type Material:
Flattened colorless prismatic crystals to 0.5 mm
Associated Minerals at Type Locality:

Synonyms of HexahydroboriteHide

Other Language Names for HexahydroboriteHide

Simplified Chinese:六方水硼石
Traditional Chinese:六方水硼石

Related Minerals - Nickel-Strunz GroupingHide

6.AC.05SinhaliteMgAl(BO4)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3Mon.
6.AC.15Béhierite(Ta5+,Nb5+)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.15Schiavinatoite(Nb,Ta)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.20FroloviteCa[B(OH)4]2Tric.
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4Tric.
6.AC.35BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.40TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)Orth. mmm (2/m 2/m 2/m) : Pbca
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2OMon.
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mm2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2OTric.
6.AC.65SeamaniteMn2+3[B(OH)4](PO4)(OH)2Orth. mmm (2/m 2/m 2/m)
6.AC.70CahniteCa2[B(OH)4](AsO4)Tet. 4 : P4

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.3.1CalciboriteCa(B2O4)Orth.
9.3.2SibirskiteCa2(HB2O5)(OH)Mon.
9.3.3FabianiteCaB3O5OHMon. 2/m : P21/b
9.3.4UralboriteCa2[B3O3(OH)5 · OB(OH)3]Mon.
9.3.5VimsiteCaB2O2(OH)4Mon.
9.3.6OlshanskyiteCa2[B3O3(OH)6](OH) · 3H2O
9.3.7FroloviteCa[B(OH)4]2Tric.
9.3.8KorzhinskiteCa(B2O4) · H2O
9.3.9TyretskiteCa2B5O9OH · H2OTric.
9.3.10NifontoviteCa3B6O6(OH)12(H2O)2Mon.
9.3.12InyoiteCa(H4B3O7)(OH) · 4H2OMon. 2/m
9.3.13GoweriteCa[B5O8(OH)][B(OH)3] · 3H2OMon.
9.3.14ColemaniteCa[B3O4(OH)3] · H2OMon. 2/m : P21/b
9.3.15PentahydroboriteCaB2O(OH)6 · 2H2OTric.
9.3.17MeyerhofferiteCa2(H3B3O7)2 · 4H2OTric. 1 : P1
9.3.18PriceiteCa2B5O7(OH)5 · H2OMon. 2/m : P21/b
9.3.19GinoriteCa2B14O20(OH)6 · 5H2OMon.
9.3.20ProbertiteNaCaB5O7(OH)4 · 3H2OMon. 2/m
9.3.21UlexiteNaCa[B5O6(OH)6] · 5H2OTric. 1 : P1
9.3.22HydroboraciteCaMg[B3O4(OH)3]2 · 3H2OMon.
9.3.23InderboriteCaMg(H3B3O7)2 · 8H2OMon. 2/m
9.3.24WardsmithiteCa5Mg[B4O7]6 · 30H2OHex.
9.3.25HenmiliteCa2Cu[B(OH)4]2(OH)4Tric.
9.3.26StrontioboriteSrB8O11(OH)4Mon.
9.3.27VeatchiteSr2B11O16(OH)5 · H2OMon. m : Bb
9.3.28Veatchite-ASr2B11O16(OH)5 · H2OTric.
9.3.29 P-VeatchiteSr2B11O16(OH)5 · H2O
9.3.30 BalavinskiteSr2B6O11 · 4H2O
9.3.31TunelliteSrB6O9(OH)2 · 3H2OMon. 2/m : P21/b
9.3.32StrontioginoriteCaSrB14O20(OH)6 · 5H2OMon. 2/m : P21/b

Other InformationHide

Notes:
Easily soluble in dilute HCl, slowly soluble in water (room temperature).
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for HexahydroboriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ozol, Y., Vimba, S., Ievins, A. (1964) The crystal structure of calcium monoborate Ca[B(OH)4]2·2H2O. Soviet Physics - Crystallography: 9: 22-25.
Sedlacek, P., Dornberger-Schiff, K. (1971) An OD-Disordered modification of the calcium monoborate dihydrate Ca[B(OH)4]2·2H2O. Acta Crystallographica: B27: 1532-1541.
Simonov, M.A., Yamanova, N.A., Kazanskaya, E.V., Egorov-Tismenko, Y.K., Belov, N.V. (1976) Crystal structure of a new natural calcium borate, hexahydroborite CaB2O4·6H2O=Ca[B(OH)]2·2H2O. Soviet Physics - Doklady: 21: 314-316.
Simonov, M.A., Yamnova, N.A., Kazanskaya, E.V., Egorov-Tismenko, Y.K., Belov, N.V. (1976) Crystal structure of Ca(B(OH)4)2(H2O)2. Doklady Akademii Nauk SSSR: 228: 1337-1340.
Fleischer, M., Cabri, L.J., Pabst, A. (1977) New mineral names. American Mineralogist: 62: 1259-1262.
Simonov, M.A., Malinko, S.V., Belov, N.V., Kazanskaya, E.V., Egorov-Tismenko, Yu.K., Fedorenko, M.B., Belokoneva, E.L., Yamnova, N.A., Kuznetsova, N.N. (1977) Hexahydroborite Ca[B(OH)4]2·2H2O - a new mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 106(6): 691-697.
Fleischer, M. (1978) New mineral names. American Mineralogist: 63: 1282-1284.
Grew, E.S., Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Kusachi, I., Takechi, Y., Kobayashi, S., Yamakawa, J., Nakamutas, Y., Lee, K.-H., Motomizu, S. (1999) Hexahydroborite from Fuka, Okayama Prefecture, Japan. Mineralogical Journal: 21(1): 9-14.

Internet Links for HexahydroboriteHide

Localities for HexahydroboriteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Japan
 
  • Honshu Island
    • Chugoku Region
      • Okayama Prefecture
        • Takahashi City
          • Bicchu-cho (Bitchu-cho)
            • Fuka
Mineralogical Journal Vol. 21 (1999) , No. 1 pp9-14
Kazakhstan
 
  • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
    • Balkhash Region (Balqash; Karatas; Prebalkhashie)
      • Sayak
        • Sayak Cu ore field
Малинко С.В., Халтурина И.И., Озол А.А., Бочаров В.М. Минералы бора, - Москва, "Недра", 1991, стр. 68-69.
Russia (TL)
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Buriatia Republic (Buryatia)
        • 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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