Karlite Mineral Data

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General Karlite Information

Chemical Formula:

(Mg,Al)6(BO3)3(OH,Cl)4

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

Empirical Formula:

Mg_4.5Al_1.5(BO₃)₃(OH)₃Cl

IMA Status:

Approved IMA 1981 (Dana # Added)

Locality:

Schlegeistal, Furtschaglhaus, Zillertal Alps, Austria Link to MinDat.org Location Data.

Name Origin:

Named for F. Karl, German professor at the University of Kiel, Austria.

Name Pronunciation:

Karlite

Synonym:

ICSD 29524

PDF 36-381

Karlite Image

Images:

Karlite

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

Axial Ratios:

a:b:c =0.9816:1:0.1727

Cell Dimensions:

a = 17.637, b = 17.967, c = 3.104, Z = 4; V = 983.61 Den(Calc)= 2.79

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.21(1), 2.83(0.92), 2.25(0.87),

Crystal Structure:

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Bonazzi P , Menchetti S , Sabelli C , Trosti-Ferroni R , Neues Jahrbuch fur Mineralogie, Monatshefte , 1986 (1986) p.253-262, Karlite: crystal structure and chemical composition, Locality: Tauern Window, Schleigeistal, Zillertaler, Alpen, Austria

Physical Properties of Karlite

Cleavage:

{001} Perfect

Color:

Light green, Silky white.

Density:

2.8 - 2.85, Average = 2.82

Diaphaneity:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

5.5 - Knife Blade

Luster:

Silky

Streak:

white

Optical Properties of Karlite

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

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

Electron Density:

Bulk Density (Electron Density)=2.76 gm/cc
note: Specific Gravity of Karlite =2.79 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Karlite= 1.52 barns/electron
U=PE_Karlite x rElectron Density= 4.22 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Karlite is Not Radioactive

Karlite Classification

Dana Class:

25.08.04.01 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.08)Dana Type

(25.08.04)Dana Group

25.08.04.01 Karlite! (Mg,Al)6(BO3)3(OH,Cl)4 P 2₁2₁2₁ 2 2 2

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

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

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Ask about Karlite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Karlite Specimen Label here :

Karlite

(Mg,Al)6(BO3)3(OH,Cl)4
Dana No: 25.08.04.01 Strunz No: 06.AB.25
Locality:

Notes: