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Trikalsilite

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Formula:
(K,Na)AlSiO
 
4
System:HexagonalColour:Colourless
Hardness:6
Name:From Greek, "tria", three, because the length of its a-axis is triple that of its dimorph Kalsilite.


Nepheline Group.

Classification of Trikalsilite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/J.02-30
Nickel-Strunz 10th (pending) edition ID:9.FA.05

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
Dana 8th edition ID:76.2.1.3

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
Hey's CIM Ref.:16.4.3

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

Type Locality:Kabfumu, Kivu, Democratic Republic of Congo (Zaïre)
General Appearance of Type Material:Fine-grained, in parallel intergrowth with nepheline and kalsilite.
Year of Discovery:1957
Geological Setting of type material:In potassic lava.

Physical Properties of Trikalsilite

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

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:
d-spacingIntensity
4.269 (35)
3.932 (30)
3.384 (25)
3.076 (100)
3.050 (95)
2.558 (45)
2.410 (35)
(
(

Chemical Properties of Trikalsilite

Formula:
(K,Na)AlSiO
 
4
Essential elements:Al, K, O, Si
All elements listed in formula:Al, K, Na, O, Si

Relationship of Trikalsilite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.FA.05Kaliophilite
KAlSiO
 
4
9.FA.05Kalsilite
KAlSiO
 
4
9.FA.05Nepheline
(Na,K)AlSiO
 
4
9.FA.05Panunzite
(K,Na)AlSiO
 
4
9.FA.05Yoshiokaite
(Ca,Na)[Al(Al,Si)O
 
4
]
9.FA.05Megakalsilite
KAlSiO
 
4
9.FA.10Malinkoite
NaBSiO
 
4
9.FA.15Virgilite
LiAlSi
 
2
O
 
6
9.FA.25Lisitsynite
KBSi
 
2
O
 
6
9.FA.30Adularia
KAlSi
 
3
O
 
8
9.FA.30Anorthoclase
(Na,K)AlSi
 
3
O
 
8
9.FA.30Buddingtonite
(NH
 
4
)AlSi
 
3
O
 
8
9.FA.30Celsian
BaAl
 
2
Si
 
2
O
 
8
9.FA.30Hyalophane
(K,Ba)[Al(Si,Al)Si
 
2
O
 
8
]
9.FA.30Microcline
KAlSi
 
3
O
 
8
9.FA.30Orthoclase
KAlSi
 
3
O
 
8
9.FA.30Sanidine
KAlSi
 
3
O
 
8
9.FA.30Rubicline
(Rb,K)AlSi
 
3
O
 
8
9.FA.30Monalbite
NaAlSi
 
3
O
 
8
9.FA.35Albite
NaAlSi
 
3
O
 
8
9.FA.35Andesine
(Na,Ca)[Al(Si,Al)Si
 
2
O
 
8
]
9.FA.35Anorthite
CaAl
 
2
Si
 
2
O
 
8
9.FA.35Bytownite
(Ca,Na)[Al(Al,Si)Si
 
2
O
 
8
]
9.FA.35Labradorite
(Ca,Na)[Al(Al,Si)Si
 
2
O
 
8
]
9.FA.35Oligoclase
(Na,Ca)[Al(Si,Al)Si
 
2
O
 
8
]
9.FA.35Reedmergnerite
Na[BSi
 
3
O
 
8
]
9.FA.40Paracelsian
BaAl
 
2
Si
 
2
O
 
8
9.FA.45Svyatoslavite
CaAl
 
2
Si
 
2
O
 
8
9.FA.45Kumdykolite
NaAlSi
 
3
O
 
8
9.FA.50Slawsonite
(Sr,Ca)Al
 
2
Si
 
2
O
 
8
9.FA.55Lisetite
CaNa
 
2
Al
 
4
Si
 
4
O
 
16
9.FA.60Banalsite
BaNa
 
2
[Al
 
2
Si
 
2
O
 
8
]
 
2
9.FA.60Stronalsite
SrNa
 
2
[Al
 
2
Si
 
2
O
 
8
]
 
2
9.FA.65Danburite
CaB
 
2
Si
 
2
O
 
8
9.FA.65Maleevite
BaB
 
2
Si
 
2
O
 
8
9.FA.65Pekovite
SrB
 
2
Si
 
2
O
 
8
9.FA.70Lingunite
(Na,Ca)AlSi
 
3
O
 
8
9.FA.75Kokchetavite
KAlSi
 
3
O
 
8
Related Minerals - Hey's Index Grouping:

- +
16.4.1Nepheline
(Na,K)AlSiO
 
4
16.4.2Panunzite
(K,Na)AlSiO
 
4
16.4.4Anorthoclase
(Na,K)AlSi
 
3
O
 
8
16.4.5Naujakasite
(Na,K)
 
6
(Fe
2+
 
,Mn
2+
 
,Ca)(Al,Fe)
 
4
Si
 
8
O
 
26
16.4.6Montesommaite
(K,Na)
 
9
Al
 
9
Si
 
23
O
 
64
 · 10H
 
2
O

Other Names for Trikalsilite

Other Languages:
German:Trikalsilit
Russian:Трикальсилит
Spanish:Trikalsilita

Other Information

Health Warning: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

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  • Raman and XRD data at RRUFF project[Link Broken?]
  • American Mineralogist Crystal Structure Database
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    • Localities for Trikalsilite

    Hide Locality List
    (TL) indicates type locality. ? 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)
     
    • Kivu
    		AmMin 42:287 (1957)
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