Megakalsilite Mineral Data

Megakalsilite Mineral Data

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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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Megakalsilite

Electron Density:

r_electron=2.58 gm/cc
note: r_{Megakalsilite}=2.62 gm/cc.

Fermion Index

Fermion Index = 0.00851
Boson Index = 0.99149

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)

Estimated Radioactivity from Megakalsilite - barely detectable

Megakalsilite Classification

Dana Class:

76.2.1.7 (76)Tectosilicate Al-Si Framework

(76.2)Feldspathoids and related species

(76.2.1)Nepheline group

76.2.1.1 Kalsilite KAlSiO4 P 3₁c 3m

76.2.1.2 Nepheline (Na,K)AlSiO4 P 6₃ 6

76.2.1.3 Trikalsilite (K,Na)AlSiO4 P 6₃ 6

76.2.1.4 Panunzite (K,Na)AlSiO4 P 6₃ 6

76.2.1.5 Kaliophilite KAlSiO4 P 6₃22 6 2 2

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

76.2.1.7 Megakalsilite ! KAlSiO4 P 6₃ 6

Strunz Class:

VIII/J.02-25 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.02 - Nepheline - Yoshiokaite series

VIII/J.02-10 Nepheline (Na,K)AlSiO4 P 6₃ 6

VIII/J.02-20 Kalsilite KAlSiO4 P 3₁c 3m

VIII/J.02-25 Megakalsilite KAlSiO4 P 6₃ 6

VIII/J.02-30 Trikalsilite (K,Na)AlSiO4 P 6₃ 6

VIII/J.02-40 Panunzite (K,Na)AlSiO4 P 6₃ 6

VIII/J.02-50 Kaliophilite KAlSiO4 P 6₃22 6 2 2

VIII/J.02-60 Yoshiokaite (Ca8-(x/2)[](x/2)Al16-xSixO32) P 3 3

VIII/J.02-70 Malinkoite! NaBSiO4 P 6₃ 6

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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

Megakalsilite

KAlSiO4
Dana No: 76.2.1.7 Strunz No: VIII/J.02-25
Locality:

Notes: