Trikalsilite
A valid IMA mineral species - grandfathered
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Formula:
K2NaAl3(SiO4)3
Also given as (K,Na)AlSiO4.
Colour:
Colourless
Lustre:
Vitreous
Hardness:
6
Crystal System:
Hexagonal
Member of:
Name:
From Greek, "tria", three, because the length of its a-axis is triple that of its dimorph Kalsilite.
Unique Identifiers
Mindat ID:
4017
Long-form identifier:
mindat:1:1:4017:0
IMA Classification of Trikalsilite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1957
Type description reference:
Classification of Trikalsilite
9.FA.05
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
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
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
16 : Silicates Containing Aluminum and other Metals
4 : Aluminosilicates of Na and K
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Tks | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Trikalsilite
Chemistry of Trikalsilite
Mindat Formula:
K2NaAl3(SiO4)3
Also given as (K,Na)AlSiO4.
Also given as (K,Na)AlSiO4.
Element Weights:
Crystallography of Trikalsilite
Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P63
Cell Parameters:
a = 15.339(4) Å, c = 8.501(2) Å
Ratio:
a:c = 1 : 0.554
Unit Cell V:
1,732.19 ų (Calculated from Unit Cell)
Z:
18
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014833 | Trikalsilite | Bonaccorsi E, Merlino S, Pasero M (1988) Trikalsilite: its structural relationships with nepheline and tetraskalsilite Neues Jahrbuch fur Mineralogie, Monatshefte 1988 559-567 | 1988 | Near Mt. Nyiragongo, Virunga volcanic field, North Kivu, Zaire | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.269 Å | (35) |
| 3.932 Å | (30) |
| 3.384 Å | (25) |
| 3.076 Å | (100) |
| 3.050 Å | (95) |
| 2.558 Å | (45) |
| 2.410 Å | (35) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Trikalsilite
General Appearance of Type Material:
Fine-grained, in parallel intergrowth with nepheline and kalsilite.
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
In potassic lava.
Associated Minerals at Type Locality:
Other Language Names for Trikalsilite
Relationship of Trikalsilite to other Species
Member of:
Other Members of Feldspathoid:
| Cancrinite Group | A large, structurally complex group of alumosilicates. | |
| 'Carnegieite' | NaAlSiO4 | Tric. |
| Davidsmithite | (Ca,◻)2Na6Al8Si8O32 | Hex. 6 : P63 |
| Kalsilite | KAlSiO4 | Hex. 6 2 2 : P63 2 2 |
| 'Metaleucite' | A name for isometric leucite that is stable above 625 degrees C. | |
| Nepheline | Na3K(Al4Si4O16) | Hex. 6 : P63 |
| Sodalite Group | The Sodalite Group is characterised by sodalite-type stacking of alumosilicate building units that produces Cubo ... | |
| Trinepheline | NaAlSiO4 | Hex. 6 : P61 |
| Yoshiokaite | (Ca,Na)[Al(Al,Si)O4] | Trig. 3 : P3 |
Related Minerals - Strunz-mindat Grouping
| 9.FA. | Bonaccorsiite | KK2Na3(Al6Si36)O84 |
| 9.FA. | Hexacelsian | BaAl2Si2O8 |
| 9.FA. | Wodegongjieite | KCa3(Al7Si9)O32 |
| 9.FA.05 | Panunzite | (K,Na)AlSiO4 |
| 9.FA.05 | Yoshiokaite | (Ca,Na)[Al(Al,Si)O4] |
| 9.FA.05 | Nepheline | Na3K(Al4Si4O16) |
| 9.FA.05 | Trinepheline | NaAlSiO4 |
| 9.FA.05 | Davidsmithite | (Ca,◻)2Na6Al8Si8O32 |
| 9.FA.05 | Kaliophilite | KAlSiO4 |
| 9.FA.05 | Kalsilite | KAlSiO4 |
| 9.FA.05 | 'Carnegieite' | NaAlSiO4 |
| 9.FA.05 | Megakalsilite | KAlSiO4 |
| 9.FA.10 | Malinkoite | NaBSiO4 |
| 9.FA.15 | Virgilite | LiAlSi2O6 |
| 9.FA.25 | Lisitsynite | KBSi2O6 |
| 9.FA.30 | Ferrisanidine | K[Fe3+Si3O8] |
| 9.FA.30 | Buddingtonite | (NH4)(AlSi3O8) |
| 9.FA.30 | Rubicline | Rb(AlSi3O8) |
| 9.FA.30 | 'Monalbite' | NaAlSi3O8 |
| 9.FA.30 | Microcline | K(AlSi3O8) |
| 9.FA.30 va | 'Germanate-celsian' | BaAl2Ge2O8 |
| 9.FA.30 | Celsian | Ba(Al2Si2O8) |
| 9.FA.30 | Sanidine | K(AlSi3O8) |
| 9.FA.30 | Orthoclase | K(AlSi3O8) |
| 9.FA.35 | Reedmergnerite | NaBSi3O8 |
| 9.FA.35 | Albite | Na(AlSi3O8) |
| 9.FA.35 | Anorthite | Ca(Al2Si2O8) |
| 9.FA.40 | Paracelsian | Ba(Al2Si2O8) |
| 9.FA.45 | Svyatoslavite | Ca(Al2Si2O8) |
| 9.FA.45 | Kumdykolite | Na(AlSi3O8) |
| 9.FA.50 | Slawsonite | Sr(Al2Si2O8) |
| 9.FA.55 | Lisetite | CaNa2Al4Si4O16 |
| 9.FA.60 | Stronalsite | Na2SrAl4Si4O16 |
| 9.FA.60 | Banalsite | Na2BaAl4Si4O16 |
| 9.FA.65 | Maleevite | BaB2Si2O8 |
| 9.FA.65 | Pekovite | SrB2Si2O8 |
| 9.FA.65 | Danburite | CaB2Si2O8 |
| 9.FA.70 | Liebermannite | KAlSi3O8 |
| 9.FA.70 | Lingunite | NaAlSi3O8 |
| 9.FA.70 | Stöfflerite | CaAl2Si2O8 |
| 9.FA.75 | Pfaffenbergite | KNa3(Al4Si12)O32 |
| 9.FA.75 | Kokchetavite | K(AlSi3O8) |
Radioactivity
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.
Internet Links for Trikalsilite
mindat.org URL:
https://www.mindat.org/min-4017.html
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References for Trikalsilite
Localities for Trikalsilite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Graham et al. (2018) |
DR Congo (TL) | |
| Sahama et al. (1957) |
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