Trikalsilite Mineral Data

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

Environment:

In lava.

IMA Status:

Valid Species (Pre-IMA) 1957

Locality:

From the Kabfumu volcanic flow, between the Mt. Mikeno and Mt. Nyiragongo volcanos, Kivu Province, Congo (Zaire). Link to MinDat.org Location Data.

Name Origin:

For the length of the [100] axis, three times that of kalsilite.

Name Pronunciation:

Trikalsilite + Pronunciation

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

Diaphaneity:

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:

Bulk Density (Electron Density)=2.60 gm/cc
note: Specific Gravity of Trikalsilite =2.64 gm/cc.

Fermion Index:

Fermion Index = 0.0087314594
Boson Index = 0.9912685406

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)
Concentration of Trikalsilite per GRapi unit = 0.37 (%)

Estimated Radioactivity from Trikalsilite - barely detectable

Trikalsilite Classification

Dana Class:

76.02.01.03 (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 Trikalsilite Information

References:

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

See Also:

Links to other databases for Trikalsilite :
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 Trikalsilite Specimen Label here :

Trikalsilite

(K,Na)AlSiO4
Dana No: 76.02.01.03 Strunz No: 09.FA.05
Locality:

Notes: