Mineralogy Database

Karlite Mineral Data

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General Karlite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Al)6(BO3)3(OH,Cl)4
Help on Composition: Composition: Molecular Weight = 412.74 gm
   Magnesium  26.50 %  Mg   43.94 % MgO
   Aluminum    9.81 %  Al   18.53 % Al2O3
   Boron       7.86 %  B    25.30 % B2O3
   Hydrogen    0.73 %  H     6.55 % H2O
   Chlorine    8.59 %  Cl    8.59 % Cl
                -   %   Cl   -1.94 % -O=Cl2   
   Oxygen     46.52 %  O
             ______        ______ 
             100.00 %      100.97 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg4.5Al1.5(BO3)3(OH)3Cl
Help on IMA Status: IMA Status: Approved IMA 1981 (Dana # Added)
Help on Locality: Locality: Schlegeistal, Furtschaglhaus, Zillertal Alps, Austria Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for F. Karl, German professor at the University of Kiel, Austria.
Help on Name Pronunciation: Name Pronunciation: Karlite Say KARLITE
Help on Synonym: Synonym: ICSD 29524
  PDF 36-381

Karlite Image

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Comments: Pale lemon yellow colored translucent crystalline fragment of karlite.
Location: Schlegeistal, Zillertaler Alpen, Tirol, Austria. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Karlite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9816:1:0.1727
Help on Cell Dimensions: Cell Dimensions: a = 17.637, b = 17.967, c = 3.104, Z = 4; V = 983.61 Den(Calc)= 2.79
Help on Crystal System: Crystal System: Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 212121
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.21(1), 2.83(0.92), 2.25(0.87),

Physical Properties of Karlite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Light green, Silky white.
Help on Density: Density: 2.8 - 2.85, Average = 2.82
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Silky
Help on Streak: Streak: white

Optical Properties of Karlite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.049 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2216,KPDmeas= 0.2189,KC= 0.23
Ncalc = 1.64 - 1.66
Help on Optical Data: Optical Data: Biaxial (-), a=1.589, b=1.632, g=1.634, bire=0.0450, 2V(Calc)=22, 2V(Meas)=24.

Calculated Properties of Karlite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.76 gm/cc
note: Specific Gravity of Karlite =2.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEKarlite = 1.52 barns/electron
U=PEKarlite x rElectron Density= 4.22 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Karlite is Not Radioactive

Karlite Classification

Help on  Dana Class: Dana Class: (25)Anhydrous Borates Containing Hydroxyl or Halogen
  (25.08)Dana Type
  (25.08.04)Dana Group Karlite! (Mg,Al)6(BO3)3(OH,Cl)4 P 212121 2 2 2
Help on  Strunz Class: Strunz Class: 06.AB.25 06 - BORATES
  06.A - Monoborates
  06.AB -BO3, with additional anions; 1(D) + OH, etc.
06.AB.25 Karlite! (Mg,Al)6(BO3)3(OH,Cl)4 P 212121 2 2 2

Other Karlite Information

Help on References: References: 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 Karlite :
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.AB.25





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