Mineralogy Database

Pentahydroborite Mineral Data

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General Pentahydroborite Information

Help on Chemical  Formula: Chemical Formula: CaB2O(OH)6•2(H2O)
Help on Composition: Composition: Molecular Weight = 215.77 gm
   Calcium   18.57 %  Ca   25.99 % CaO
   Boron     10.02 %  B    32.26 % B2O3
   Hydrogen   4.67 %  H    41.75 % H2O
   Oxygen    66.73 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaB2O(OH)6•2(H2O)
Help on Environment: Environment: Skarn mineral.
Help on IMA Status: IMA Status: Approved IMA 1962
Help on Locality: Locality: Solongo, Transbaikalia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition.
Help on Name Pronunciation: Name Pronunciation: Pentahydroborite + Pronunciation Say PENTAHYDROBORITE
Help on Synonym: Synonym: ICSD 200083
  PDF 14-339

Pentahydroborite Image

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Comments: Transparent, tabular crystal of pentahydroborite on massive material.
Location: Fuka Mine, Bicchu Town, Kawakama Co., Okayama Pref., Japan. Scale: Crystal size 0.8 cm.
© John Veevaert

Pentahydroborite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.2022:1:1.245
Help on Cell Dimensions: Cell Dimensions: a = 7.845, b = 6.525, c = 8.124, Z = 2; alpha = 111.62°, beta = 111.9°, gamma = 73.44° V = 343.82 Den(Calc)= 2.08
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.04(1), 2.99(0.9), 3.54(0.8),

Physical Properties of Pentahydroborite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 2 - 2.03, Average = 2.01
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Fluorescent, Short UV=violet.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Pentahydroborite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2645,KPDmeas= 0.2665,KC= 0.2659
Ncalc = 1.53 - 1.54
Help on Optical Data: Optical Data: Biaxial (+), a=1.531, b=1.536, g=1.544, bire=0.0130
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Pentahydroborite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.09 gm/cc
note: Specific Gravity of Pentahydroborite =2.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEPentahydroborite = 2.45 barns/electron
U=PEPentahydroborite x rElectron Density= 5.12 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pentahydroborite is Not Radioactive

Pentahydroborite Classification

Help on  Dana Class: Dana Class: (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.02)Dana Type
  (26.02.01)Dana Group Pentahydroborite CaB2O(OH)6•2(H2O) P1 1
Help on  Strunz Class: Strunz Class: 06.BB.10 06 - BORATES
  06.B - Diborates
  06.BB -Neso-diborates with double tetrahedra B2O(OH)6; 2(2T)
06.BB.10 Pentahydroborite CaB2O(OH)6•2(H2O) P1 1

Other Pentahydroborite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8;Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Pentahydroborite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 06.BB.10





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