Mineralogy Database

Boracite Mineral Data

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General Boracite Information

Help on Chemical  Formula: Chemical Formula: Mg3B7O13Cl
Help on Composition: Composition: Molecular Weight = 392.03 gm
   Magnesium  18.60 %  Mg   30.84 % MgO
   Boron      19.30 %  B    62.15 % B2O3
   Chlorine    9.04 %  Cl    9.04 % Cl
                -   %   Cl   -2.04 % -O=Cl2   
   Oxygen     53.06 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg3B7O13Cl
Help on Environment: Environment: Marine evaporites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1789
Help on Locality: Locality: Luneburg and Hildesheim, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its composition containing boron.
Help on Name Pronunciation: Name Pronunciation: Boracite Say BORACITE
Help on Synonym: Synonym: ICSD 9290
  PDF 5-710

Boracite Image

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Comments: Clear, pale green pseudo-cubic boracite crystal.
Location: Sonderhausen, Thuringia, Germany. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

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Comments: A greenish crystal of boracite, a tetrahedron modified by cube and dodecahedral faces.
Location: Bernburg, Sachsen-Anhalt, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

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  Hilgardite   Boracite

Comments: Sub-mm reddish orange crystals of hilgardite on white boracite.
Location: Boulby Mine, Loftus, Cleveland, Great Britain. Scale: 1.5 x 2.5 cm.
© John Veevaert

Boracite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1:1:1.4168
Help on Cell Dimensions: Cell Dimensions: a = 8.54, b = 8.54, c = 12.1, Z = 4; V = 882.47 Den(Calc)= 2.95
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: P ca21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.058(1), 3.044(0.7), 2.72(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 1) ( 1 0 1) ( 1 0 0) ( 0 0 1)

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Physical Properties of Boracite

Help on Cleavage: Cleavage: None
Help on Color: Color: Blue green, Colorless, Gray, Yellow, White.
Help on Density: Density: 2.9
Help on Diaphaneity: Diaphaneity: Subtransparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Disseminated - Occurs in small, distinct particles dispersed in matrix.
Help on Hardness: Hardness: 7 - Quartz
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: white

Optical Properties of Boracite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2254,KPDmeas= 0.2293,KC= 0.2239
Ncalc = 1.65 - 1.66
Help on Optical Data: Optical Data: Biaxial (+), a=1.658-1.6622, b=1.662-1.667, g=1.668-1.673, bire=0.0100-0.0108

Calculated Properties of Boracite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.89 gm/cc
note: Specific Gravity of Boracite =2.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEBoracite = 1.21 barns/electron
U=PEBoracite x rElectron Density= 3.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Boracite is Not Radioactive

Boracite Classification

Help on  Dana Class: Dana Class: (25)Anhydrous Borates Containing Hydroxyl or Halogen
  (25.06)Dana Type
  (25.06.01)Boracite Group (Orthorhombic: Rca21) Boracite Mg3B7O13Cl P ca21 mm2 Ericaite (Fe,Mg,Mn)3B7O13Cl P ca21 mm2 Chambersite Mn3B7O13Cl P ca21 mm2
Help on  Strunz Class: Strunz Class: 06.GA.05 06 - BORATES
  06.G - Heptaborates and other Megaborates
  06.GA -Tekto-heptaborates
06.GA.05 Boracite Mg3B7O13Cl P ca21 mm2
06.GA.05 Chambersite Mn3B7O13Cl P ca21 mm2
06.GA.05 Ericaite (Fe,Mg,Mn)3B7O13Cl P ca21 mm2

Other Boracite Information

Help on References: References: NAME( Duda&Rejl90) 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 Boracite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
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 - HyperPhysics
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.GA.05





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