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Pentahydroborite

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Formula:
CaB2O(OH)6 · 2H2O
System:
Triclinic
Colour:
Colourless
Lustre:
Vitreous
Hardness:
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.


Classification of Pentahydroborite

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 Pentahydroborite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colourless
Hardness (Mohs):

Optical Data of Pentahydroborite

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 Pentahydroborite

Formula:
CaB2O(OH)6 · 2H2O
Elements listed in formula:

Crystallography of Pentahydroborite

Crystal System:
Triclinic

Type Occurrence of Pentahydroborite

Relationship of Pentahydroborite to other Species

9.3.1CalciboriteCaB2O4
9.3.2SibirskiteCaHBO3
9.3.3FabianiteCaB3O5(OH)
9.3.4UralboriteCaB2O2(OH)4
9.3.5VimsiteCaB2O2(OH)4
9.3.6OlshanskyiteCa2[B3O3(OH)6]OH · 3H2O
9.3.7FroloviteCa[B(OH)4]2
9.3.8KorzhinskiteCaB2O4 · 0.5H2O
9.3.9TyretskiteCa2B5O9(OH) · H2O
9.3.10NifontoviteCa3[BO(OH)2]6 · 2H2O
9.3.12InyoiteCaB3O3(OH)5 · 4H2O
9.3.13GoweriteCa[B5O8(OH)][B(OH)3] · 3H2O
9.3.14ColemaniteCaB3O4(OH)3 · H2O
9.3.16HexahydroboriteCa[B(OH)4]2 · 2H2O
9.3.17MeyerhofferiteCaB3O3(OH)5 · H2O
9.3.18PriceiteCa2B5O7(OH)5 · H2O
9.3.19GinoriteCa2B14O20(OH)6 · 5H2O
9.3.20ProbertiteNaCaB5O7(OH)4 · 3H2O
9.3.21UlexiteNaCaB5O6(OH)6 · 5H2O
9.3.22HydroboraciteCaMg[B3O4(OH)3]2 · 3H2O
9.3.23InderboriteCaMg[B3O3(OH)5]2 · 6H2O
9.3.24WardsmithiteCa5Mg(B4O7)6 · 30H2O
9.3.25HenmiliteCa2Cu[B(OH)4]2(OH)4
9.3.26StrontioboriteSrB8O11(OH)4
9.3.27VeatchiteSr2[B5O8(OH)]2B(OH)3 · H2O
9.3.28Veatchite-ASr2B11O16(OH)5 · H2O
9.3.29 P-VeatchiteSr2B11O16(OH)5 · H2O
9.3.30 BalavinskiteSr2B6O11 · 4H2O
9.3.31TunelliteSrB6O9(OH)2 · 3H2O
9.3.32StrontioginoriteSrCaB14O20(OH)6 · 5H2O

Other Names for Pentahydroborite

Name in Other Languages:

Other Information

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 Pentahydroborite

Reference List:
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 Pentahydroborite

mindat.org URL:
https://www.mindat.org/min-3154.html
Please feel free to link to this page.
Specimens:
The following Pentahydroborite specimens are currently listed for sale on minfind.com.

Localities for Pentahydroborite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
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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