Megakalsilite Mineral Data

General Megakalsilite Information

Chemical Formula:

KAlSiO4

Composition:

Molecular Weight = 158.16 gm

Potassium 24.72 % K 29.78 % K₂O

Aluminum 17.06 % Al 32.23 % Al₂O₃

Silicon 17.76 % Si 37.99 % SiO₂

Oxygen 40.46 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KAlSiO₄

Environment:

Hyperagpaitic pegmatite. (close to kalsilite; structure)

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Khibina alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named to reflect the large (MEGA) unit cell relative to kalsilite.

Synonym:

IMA2001-008

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Megakalsilite Crystallography

Axial Ratios:

a:c = 1:0.46768

Cell Dimensions:

a = 18.104, c = 8.467, Z = 24; V = 2,403.31 Den(Calc)= 2.62

Crystal System:

Hexagonal - PyramidalH-M Symbol (6) Space Group: P 6₃

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

By Intensity(I/I_o): 3.09(1)(100,222), 2.612(0.7)(060), 1.24(0.6)(4.10.1,066,583),1.516(0.5)(145,660), 1.585(0.5)(282), 1.674(0.5)(173), 3.18(0.5)(141),

Crystal Structure:

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Khomyakov A P , Nechelyustov G N , Sokolova E V , Bonaccorsi E , Merlino S , Pasero M , The Canadian Mineralogist , 40 (2002) p.961-970, Megakalsilite, a new polymorph of KAlSiO4 from the Khibina alkaline massif,, Kola Peninsula, Russia: mineral description and crystal structure, Locality: Khibina alkaline massif, Kola Peninsula, Russia

Physical Properties of Megakalsilite

Color:

Colorless.

Density:

2.58

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Megakalsilite

Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.204,KPDmeas= 0.2072,KC= 0.2041
Ncalc = 1.53

Optical Data:

Uniaxial (-), e=1.531, w=1.538, bire=0.0070.

Calculated Properties of Megakalsilite

Electron Density:

Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Megakalsilite =2.62 gm/cc.

Fermion Index:

Fermion Index = 0.0085165557
Boson Index = 0.9914834443

Photoelectric:

PE_{Megakalsilite}= 3.65 barns/electron
U=PE_{Megakalsilite} x r_electron= 9.44 barns/cc.

Radioactivity:

GRapi = 351.79 (Gamma Ray American Petroleum Institute Units)
Concentration of Megakalsilite per GRapi unit = 0.28 (%)

Estimated Radioactivity from Megakalsilite - barely detectable

Megakalsilite Classification

Dana Class:

76.02.01.07 (76)Tectosilicate Al-Si Framework

(76.02)Feldspathoids and related species

(76.02.01)Nepheline group

76.02.01.01 Kalsilite KAlSiO4 P 3₁c 3m

76.02.01.02 Nepheline (Na,K)AlSiO4 P 6₃ 6

76.02.01.03 Trikalsilite (K,Na)AlSiO4 P 6₃ 6

76.02.01.04 Panunzite (K,Na)AlSiO4 P 6₃ 6

76.02.01.05 Kaliophilite KAlSiO4 P 6₃22 6 2 2

76.02.01.06 Yoshiokaite (Ca8-(x/2)[](x/2)Al16-xSixO32) P 3 3

76.02.01.07 Megakalsilite! KAlSiO4 P 6₃ 6

Strunz Class:

09.FA.05 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1

09.FA.05 Nepheline (Na,K)AlSiO4 P 6₃ 6

09.FA.05 Kaliophilite KAlSiO4 P 6₃22 6 2 2

09.FA.05 Kalsilite KAlSiO4 P 3₁c 3m

09.FA.05 Panunzite (K,Na)AlSiO4 P 6₃ 6

09.FA.05 Trikalsilite (K,Na)AlSiO4 P 6₃ 6

09.FA.05 Megakalsilite! KAlSiO4 P 6₃ 6

09.FA.05 Yoshiokaite (Ca8-(x/2)[](x/2)Al16-xSixO32) P 3 3

Other Megakalsilite Information

References:

NAME( AmMin, Vol 88, p 476) PHYS. PROP.(AmMin, Vol 88, p 476) OPTIC PROP.(AmMin, Vol 88, p 476)

See Also:

Links to other databases for Megakalsilite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Megakalsilite

KAlSiO4
Dana No: 76.02.01.07 Strunz No: 09.FA.05
Locality:

Notes: