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Pentahydroborite

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Formula:
CaB2O(OH)6 · 2H2O
Colour:
Colourless
Lustre:
Vitreous
Hardness:
Crystal System:
Triclinic
Name:
The "penta" in pentahydroborite is rather a misnomer for a species with only 2 waters, but this came about because the 6 (OH) had originally been mistaken for 3 extra waters.
This page provides mineralogical data about Pentahydroborite.


Hide all sections | Show all sections

Classification of PentahydroboriteHide

Approved
6.BB.10

6 : BORATES
B : Diborates
B : Neso-diborates with double tetrahedra B2O(OH)6; 2(2T)
26.2.1.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
2 : Diborates
9.3.15

9 : Borates
3 : Borates of Ca and Sr

Physical Properties of PentahydroboriteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Hardness:
2½ on Mohs scale

Optical Data of PentahydroboriteHide

Type:
Biaxial (+)
RI values:
nα = 1.531 nβ = 1.536 nγ = 1.544
Max Birefringence:
δ = 0.013
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v moderate

Chemical Properties of PentahydroboriteHide

Formula:
CaB2O(OH)6 · 2H2O

Crystallography of PentahydroboriteHide

Crystal System:
Triclinic

Type Occurrence of PentahydroboriteHide

Other Language Names for PentahydroboriteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Andradite13 photos of Pentahydroborite associated with Andradite on mindat.org.
Galena13 photos of Pentahydroborite associated with Galena on mindat.org.
Wurtzite13 photos of Pentahydroborite associated with Wurtzite on mindat.org.
Henmilite3 photos of Pentahydroborite associated with Henmilite on mindat.org.
Calcite2 photos of Pentahydroborite associated with Calcite on mindat.org.
Frolovite1 photo of Pentahydroborite associated with Frolovite on mindat.org.
Charlesite1 photo of Pentahydroborite associated with Charlesite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.BB.05PinnoiteMg[B2O(OH)6]Tet. 4/m : P42/m

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
9.3.16HexahydroboriteCa[B(OH)4]2 · 2H2O or CaB2O4 · 6H2OMon. 2/m : B2/b
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

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 PentahydroboriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1962): 47: 1482.
Soviet Physics – Crystallography: 22: 35-36.
American Mineralogist (1986): 71: 1234.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for PentahydroboriteHide

Localities for PentahydroboriteHide

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.
China
 
  • Inner Mongolia Autonomous Region
    • Ulanhad League (Chifeng Prefecture)
      • Linxi Co.
        • Linxi
Jordi Fabre; Ottens, B. & Bin, J. (2014): Seltene Boratmineralien aus der Inneren Mongolei, China. Lapis, 39 (7/8), 66-68.
Japan
 
  • Honshu Island
    • Chugoku Region
      • Okayama Prefecture
        • Takahashi City
          • Bicchu-cho (Bitchu-cho)
            • Fuka
Mineralogical Record: 27: 306.; Journal of Mineralogical and Petrological Sciences Vol. 99 (2004) , No. 2 April 67-71
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Buriatia Republic (Buryatia)
        • Vitim Plateau
[AmMin 85:1322]; 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
  • Urals Region
    • Middle Urals
      • Sverdlovskaya Oblast'
        • Krasnotur'insk (Bogolovsk; Krasnoturjinsk; Krasnoturyinsk)
          • Turya river
            • Tur'insk
[AmMin 85:1322]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Serbia
 
  • Raška District
    • Raška
      • Jarandol Basin
        • Baljevac na Ibru
S. V. Malinko et al.: New Data on Minerals 39:26-31 (2004)
Mineral and/or Locality  
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