Kalborsite Mineral Data

General Kalborsite Information

Chemical Formula:

K6Al4Si6BO20(OH)4Cl

Composition:

Molecular Weight = 989.63 gm

Potassium 23.70 % K 28.55 % K₂O

Aluminum 10.91 % Al 20.61 % Al₂O₃

Silicon 17.03 % Si 36.43 % SiO₂

Boron 1.53 % B 4.92 % B₂O₃

Hydrogen 0.41 % H 3.64 % H₂O

Chlorine 3.58 % Cl 3.58 % Cl

- % Cl -0.81 % -O=Cl₂

Oxygen 42.84 % O

______ ______

100.00 % 96.93 % = TOTAL OXIDE

Empirical Formula:

K₆Al₄Si₆B_1.4O_22.5(OH)₄Cl

Environment:

Rims around lovozeroite in segregations of petolite, in richorrite pegmatite from a differentiated alkalic massif.

IMA Status:

Approved IMA 1980

Locality:

Mount Rasvumchorr, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition (KAllium, ALuminum,BORate, and SIlicon).

Name Pronunciation:

Kalborsite + Pronunciation

Synonym:

ICSD 34580

PDF 33-999

Kalborsite Image

Images:

Kalborsite

Comments: White crystals of kalborsite rimming eudialyte.
Location: Mt. Rasvumchorr, Chibiny, Kola Peninsula, Russia. Scale: FOV Est 4 mm.
© Diederik Visser

Kalborsite Crystallography

Axial Ratios:

a:c = 1:1.32575

Cell Dimensions:

a = 9.851, c = 13.06, Z = 2; V = 1,267.37 Den(Calc)= 2.59

Crystal System:

Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: P 42m

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

By Intensity(I/I_o): 3.08(1), 2.79(0.9), 3.44(0.8),2.94(0.8), 2.08(0.5), 2.24(0.5), 3.26(0.5),

Physical Properties of Kalborsite

Cleavage:

{110} Perfect

Color:

Brownish pink, Colorless.

Density:

2.5

Diaphaneity:

Transparent

Habit:

Epitaxial - Crystallographic alignment with a precursor mineral

Hardness:

6 - Orthoclase

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Kalborsite

Gladstone-Dale:

CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2027,KPDmeas= 0.21,KC= 0.2087
Ncalc = 1.52 - 1.54

Optical Data:

Uniaxial (+), w=1.525, e=1.525, bire=0.0000.

Calculated Properties of Kalborsite

Electron Density:

Bulk Density (Electron Density)=2.48 gm/cc
note: Specific Gravity of Kalborsite =2.50 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Kalborsite= 3.61 barns/electron
U=PE_Kalborsite x r_electron= 8.93 barns/cc.

Radioactivity:

GRapi = 338.72 (Gamma Ray American Petroleum Institute Units)
Concentration of Kalborsite per GRapi unit = 0.30 (%)

Estimated Radioactivity from Kalborsite - barely detectable

Kalborsite Classification

Dana Class:

77.02.07.01 (77)Tectosilicate Zeolite group

(77.02)related species

(77.02.07)Dana Group

77.02.07.01 Kalborsite K6Al4Si6BO20(OH)4Cl P 42m 4 2m

Strunz Class:

09.GA.15 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GA -Zeolites with T5O10 Units � The Fibrous Zeolites

09.GA.15 Edingtonite BaAl2Si3O10•4(H2O) P 2₁2₁2 2 2 2

09.GA.15 Kalborsite K6Al4Si6BO20(OH)4Cl P 42m 4 2m

Other Kalborsite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Kalborsite :
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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Print or Cut-and-Paste your Kalborsite Specimen Label here :

Kalborsite

K6Al4Si6BO20(OH)4Cl
Dana No: 77.02.07.01 Strunz No: 09.GA.15
Locality:

Notes:

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