Trikalsilite Mineral Data

Trikalsilite Mineral Data +

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General Trikalsilite Information

Chemical Formula:

(K,Na)AlSiO4

Composition:

Molecular Weight = 154.14 gm

Potassium 19.02 % K 22.92 % K₂O

Sodium 3.73 % Na 5.03 % Na₂O

Aluminum 17.51 % Al 33.08 % Al₂O₃

Silicon 18.22 % Si 38.98 % SiO₂

Oxygen 41.52 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_0.75Na_0.25AlSiO₄

IMA Status:

Valid Species (Pre-IMA) 1957

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 40445

PDF 12-197

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Trikalsilite Crystallography

Axial Ratios:

a:c = 1:0.55622

Cell Dimensions:

a = 15.35, c = 8.538, Z = 18; V = 1,742.22 Den(Calc)= 2.64

Crystal System:

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

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

By Intensity(I/I_o): 3.076(1), 3.05(0.95), 2.558(0.45),

Crystal Structure:

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Bonaccorsi E , Merlino S , Pasero M , Neues Jahrbuch fur Mineralogie, Monatshefte , 1988 (1988) p.559-567, Trikalsilite: its structural relationships with nepheline and tetraskalsilite, Locality: Near Mt. Nyiragongo, Virunga volcanic field, North Kivu, Zaire

Physical Properties of Trikalsilite

Cleavage:

None

Color:

Colorless.

Density:

2.63

Diaphaniety:

Transparent

Fracture:

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

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Trikalsilite

Optical Data:

NCalc= 1.54 - from Gladstone-Dale relationship (KC = 0.204) where Ncalc=Dcalc*KC+1
NCalc= 1.54 - from Gladstone-Dale relationship (KC = 0.204) where Ncalc=Dmeas*KC+1

Calculated Properties of Trikalsilite

Electron Density:

r_electron=2.60 gm/cc
note: r_Trikalsilite=2.64 gm/cc.

Fermion Index

Fermion Index = 0.00873
Boson Index = 0.99127

Photoelectric:

PE_Trikalsilite= 3.17 barns/electron
U=PE_Trikalsilite x r_electron= 8.26 barns/cc.

Radioactivity:

GRapi = 270.67 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Trikalsilite - barely detectable

Trikalsilite Classification

Dana Class:

76.2.1.3 (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.02-30 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 Trikalsilite Information

References:

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

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Trikalsilite

(K,Na)AlSiO4
Dana No: 76.2.1.3 Strunz No: VIII/J.02-30
Locality:

Notes: