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Megakalsilite

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Formula:
KAlSiO4
Colour:
Colourless
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
2.58
Crystal System:
Hexagonal
Name:
Named in allusion to the size of the Z value since it shares the same chemical formula with kalsilite, but its unit cell is 12 times larger.
Dimorph of:
This page provides mineralogical data about Megakalsilite.


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Classification of MegakalsiliteHide

Approved
Approval Year:
2001
9.FA.05

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions

Physical Properties of MegakalsiliteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.58(2) g/cm3 (Measured)    2.62 g/cm3 (Calculated)

Optical Data of MegakalsiliteHide

Type:
Uniaxial (-)
RI values:
nω = 1.538() nε = 1.531(1)
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemical Properties of MegakalsiliteHide

Formula:
KAlSiO4

Crystallography of MegakalsiliteHide

Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P63
Cell Parameters:
a = 18.1111(8) Å, c = 8.4619(4) Å
Ratio:
a:c = 1 : 0.467
Unit Cell V:
2,403.74 ų (Calculated from Unit Cell)
Z:
24

Type Occurrence of MegakalsiliteHide

General Appearance of Type Material:
irregularly shaped grain 2 -3 mm across,
Place of Conservation of Type Material:
Fersman Mineralogical Museum, catalogue #2624/1, Russian Academy of Sciences, in Moscow, Russia.
Geological Setting of Type Material:
Hyperagpaitic pegmatite in ijolite–urtite, near their contact with apatite–nepheline rocks.
Associated Minerals at Type Locality:

Synonyms of MegakalsiliteHide

Other Language Names for MegakalsiliteHide

Simplified Chinese:梅钾霞石
Traditional Chinese:梅鉀霞石

Related Minerals - Nickel-Strunz GroupingHide

9.FA.05KaliophiliteKAlSiO4Hex.
9.FA.05KalsiliteKAlSiO4Hex. 6 2 2 : P63 2 2
9.FA.05NephelineNa3K(Al4Si4O16)Hex. 6 : P63
9.FA.05Panunzite(K,Na)AlSiO4Hex. 6 : P63
9.FA.05Trikalsilite(K,Na)AlSiO4Hex.
9.FA.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3
9.FA.10MalinkoiteNaBSiO4Hex. 6 : P63
9.FA.15VirgiliteLiAlSi2O6Hex. 6 2 2 : P62 2 2
9.FA.25LisitsyniteKBSi2O6Orth. 2 2 2 : P2 2 2
9.FA.30AdulariaKAlSi3O8Mon.
9.FA.30Anorthoclase(Na,K)AlSi3O8Tric.
9.FA.30Buddingtonite(NH4)(AlSi3)O8Mon. 2 : P21
9.FA.30CelsianBa(Al2Si2O8)Mon. 2/m
9.FA.30Hyalophane(K,Ba)[Al(Si,Al)Si2O8]Mon.
9.FA.30MicroclineK(AlSi3O8)Tric. 1
9.FA.30OrthoclaseK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30SanidineK(AlSi3O8)Mon. 2/m : B2/m
9.FA.30RubiclineRb(AlSi3O8)Tric.
9.FA.30MonalbiteNaAlSi3O8Mon. 2/m : B2/m
9.FA.35AlbiteNa(AlSi3O8)Tric. 1
9.FA.35Andesine(Na,Ca)[Al(Si,Al)Si2O8]Tric.
9.FA.35AnorthiteCa(Al2Si2O8)Tric. 1 : P1
9.FA.35Bytownite(Ca,Na)[Al(Al,Si)Si2O8]Tric.
9.FA.35Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35ReedmergneriteNaBSi3O8Tric.
9.FA.40ParacelsianBa(Al2Si2O8)Mon.
9.FA.45SvyatoslaviteCa(Al2Si2O8)Orth.
9.FA.45KumdykoliteNa(AlSi3O8)Orth. mmm (2/m 2/m 2/m) : Pnnm
9.FA.50SlawsoniteSr(Al2Si2O8)Mon.
9.FA.55LisetiteCaNa2Al4Si4O16Orth.
9.FA.60BanalsiteNa2BaAl4Si4O16Orth.
9.FA.60StronalsiteNa2SrAl4Si4O16Orth.
9.FA.65DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
9.FA.65MaleeviteBaB2Si2O8Orth. mmm (2/m 2/m 2/m) : Pnma
9.FA.65PekoviteSrB2Si2O8
9.FA.70Lingunite(Na,Ca)AlSi3O8Tet. 4/m : I4/m
9.FA.75KokchetaviteK(AlSi3O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm

Fluorescence of MegakalsiliteHide

pale whitish green

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MegakalsiliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Khomyakov, A. P., Nechelyustov, G. N., Sokolova, E., Bonaccorsi, E., Merlino, S., & Pasero, M. (2002). Megakalsilite, a new polymorph of KAlSiO4 from the Khibina alkaline massif, Kola peninsula, Russia: Mineral description and crystal structure. The Canadian Mineralogist, 40(3), 961-970.
McGuire, Meaghan Clark, Ivor Bull, and Geoffrey Mark Johnson. "Synthetic Megakalsilite via Hydrothermal Preparation." U.S. Patent Application 14/204,079, filed September 11, 2014.

Internet Links for MegakalsiliteHide

Localities for MegakalsiliteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Murmansk Oblast
    • Khibiny Massif
      • Koashva Mt
Can Min (2002) 40, (3), 961-970 ; Khomyakov, A. P., Nechelyustov, G. N., Sokolova, E., Bonaccorsi, E., Merlino, S., & Pasero, M. (2002). Megakalsilite, a new polymorph of KAlSiO4 from the Khibina alkaline massif, Kola peninsula, Russia: Mineral description and crystal structure. The Canadian Mineralogist, 40(3), 961-970.
Mineral and/or Locality  
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