Mineralogy Database

Hydroboracite Mineral Data

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General Hydroboracite Information

Help on Chemical  Formula: Chemical Formula: CaMgB6O8(OH)6•3(H2O)
Help on Composition: Composition: Molecular Weight = 413.33 gm
   Calcium     9.70 %  Ca   13.57 % CaO
   Magnesium   5.88 %  Mg    9.75 % MgO
   Boron      15.69 %  B    50.53 % B2O3
   Hydrogen    2.93 %  H    26.15 % H2O
   Oxygen     65.80 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaMgB6O8(OH)6•3(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1834
Help on Locality: Locality: Caucasus Mountains, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition (water, borate).
Help on Name Pronunciation: Name Pronunciation: Hydroboracite + Pronunciation Say HYDROBORACITE
Help on Synonym: Synonym: ICSD 200417
  PDF 42-546

Hydroboracite Image

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Comments: White, acicular crystal clusters of hydroboracite.
Location: U. S. Borax Open Pit, Boron, Kern County, California, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Hydroboracite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7607:1:1.232
Help on Cell Dimensions: Cell Dimensions: a = 11.769, b = 6.684, c = 8.235, Z = 2; beta = 102.59° V = 632.22 Den(Calc)= 2.17
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.77(1), 6.68(0.85), 3.32(0.5),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 1 0) ( 1 1 1) ( 1 0 0) ( 0 1 1)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Hydroboracite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless, Greenish, White, Light brown, Wine yellow.
Help on Density: Density: 2
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Foliated - Two dimensional platy forms.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white

Optical Properties of Hydroboracite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.104 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2498,KPDmeas= 0.271,KC= 0.2455
Ncalc = 1.49 - 1.53
Help on Optical Data: Optical Data: Biaxial (+), a=1.52-1.523, b=1.534-1.535, g=1.569-1.571, bire=0.0480-0.0490, 2V(Calc)=62-66, 2V(Meas)=60-66. Dispersion relatively weak.

Calculated Properties of Hydroboracite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.21 gm/cc
note: Specific Gravity of Hydroboracite =2.17 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEHydroboracite = 1.56 barns/electron
U=PEHydroboracite x rElectron Density= 3.44 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hydroboracite is Not Radioactive

Hydroboracite Classification

Help on  Dana Class: Dana Class: (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.03)Dana Type
  (26.03.06)Dana Group Hydroboracite CaMgB6O8(OH)6•3(H2O) P 2/c 2/m
Help on  Strunz Class: Strunz Class: 06.CB.15 06 - BORATES
  06.C - Triborates
  06.CB -Ino-triborates
06.CB.15 Hydroboracite CaMgB6O8(OH)6•3(H2O) P 2/c 2/m

Other Hydroboracite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(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 Hydroboracite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 06.CB.15





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