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Trikalsilite

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Formula:
(K,Na)AlSiO4
System:
Hexagonal
Colour:
Colourless
Lustre:
Vitreous
Hardness:
6
Name:
From Greek, "tria", three, because the length of its a-axis is triple that of its dimorph Kalsilite.

Classification of Trikalsilite

Approved, 'Grandfathered' (first described prior to 1959)
9.FA.05

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
76.2.1.3

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
16.4.3

16 : Silicates Containing Aluminum and other Metals
4 : Aluminosilicates of Na and K

Physical Properties of Trikalsilite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Colourless
Hardness (Mohs):
6

Chemical Properties of Trikalsilite

Formula:
(K,Na)AlSiO4
IMA Formula:
K2NaAl3(SiO4)3
Elements listed in formula:

Crystallography of Trikalsilite

Crystal System:
Hexagonal
Cell Parameters:
a = 15.339(4) Å, c = 8.501(2) Å
Ratio:
a:c = 1 : 0.554
Unit Cell Volume:
V 1,732.19 ų (Calculated from Unit Cell)
Z:
18
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.269 (35)
3.932 (30)
3.384 (25)
3.076 (100)
3.050 (95)
2.558 (45)
2.410 (35)
(
(

Type Occurrence of Trikalsilite

General Appearance of Type Material:
Fine-grained, in parallel intergrowth with nepheline and kalsilite.
Geological Setting of Type Material:
In potassic lava.

Relationship of Trikalsilite to other Species

9.FA.05KaliophiliteKAlSiO4
9.FA.05KalsiliteKAlSiO4
9.FA.05Nepheline(Na,K)AlSiO4
9.FA.05Panunzite(K,Na)AlSiO4
9.FA.05Yoshiokaite(Ca,Na)[Al(Al,Si)O4]
9.FA.05MegakalsiliteKAlSiO4
9.FA.10MalinkoiteNaBSiO4
9.FA.15VirgiliteLiAlSi2O6
9.FA.25LisitsyniteKBSi2O6
9.FA.30AdulariaKAlSi3O8
9.FA.30Anorthoclase(Na,K)AlSi3O8
9.FA.30Buddingtonite(NH4)(AlSi3)O8
9.FA.30CelsianBa(Al2Si2O8)
9.FA.30Hyalophane(K,Ba)[Al(Si,Al)Si2O8]
9.FA.30MicroclineK(AlSi3O8)
9.FA.30OrthoclaseK(AlSi3O8)
9.FA.30SanidineK(AlSi3O8)
9.FA.30RubiclineRb(AlSi3O8)
9.FA.30MonalbiteNaAlSi3O8
9.FA.35AlbiteNa(AlSi3O8)
9.FA.35Andesine(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35AnorthiteCa(Al2Si2O8)
9.FA.35Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35ReedmergneriteNaBSi3O8
9.FA.40ParacelsianBa(Al2Si2O8)
9.FA.45SvyatoslaviteCa(Al2Si2O8)
9.FA.45KumdykoliteNa(AlSi3O8)
9.FA.50SlawsoniteSr(Al2Si2O8)
9.FA.55LisetiteCaNa2Al4Si4O16
9.FA.60BanalsiteNa2BaAl4Si4O16
9.FA.60StronalsiteNa2SrAl4Si4O16
9.FA.65DanburiteCaB2Si2O8
9.FA.65MaleeviteBaB2Si2O8
9.FA.65PekoviteSrB2Si2O8
9.FA.70Lingunite(Na,Ca)AlSi3O8
9.FA.75KokchetaviteK(AlSi3O8)
16.4.1Nepheline(Na,K)AlSiO4
16.4.2Panunzite(K,Na)AlSiO4
16.4.4Anorthoclase(Na,K)AlSi3O8
16.4.5Naujakasite(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26
16.4.6Montesommaite(K,Na)9Al9Si23O64 · 10H2O

Other Names for Trikalsilite

Name in Other Languages:

Other Information

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 Trikalsilite

Reference List:
Sahama T.G., Smith J.V. (1957) Tri-kalsilite, a new mineral. American Mineralogist, 42, 286.

Bonaccorsi E., Merlino S., Pasero M. (1988), Trikalsilite: its structural relationships with nepheline and tetrakalsilite. Neues Jahrbuch für Mineralogie, Monatshefte (1988): (12): 559-567.

Internet Links for Trikalsilite

mindat.org URL:
https://www.mindat.org/min-4017.html
Please feel free to link to this page.

Localities for Trikalsilite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Democratic Republic of Congo (Zaïre) (TL)
 
  • Kivu
AmMin 42:287 (1957)
Mineral and/or Locality  
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