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:	K0.75Na0.25AlSiO4
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
X Ray Diffraction:	By Intensity(I/Io): 3.076(1), 3.05(0.95), 2.558(0.45),
Crystal Structure: Mouse drag1 - LMB Manipulate Structure drag2 - RMB Resize/Rotate Keyboard S - Stereo Pair on/off H - Help Screen I - Data Info A - Atoms On/Off P - Polyhedra On/Off B - Bonds On/Off Help on Above	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:	relectron=2.60 gm/cc note: rTrikalsilite =2.64 gm/cc.
Fermion Index	Fermion Index = 0.00873 Boson Index = 0.99127
Photoelectric:	PETrikalsilite = 3.17 barns/electron U=PETrikalsilite x relectron= 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)
See Also:	Links to other databases for Trikalsilite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Trikalsilite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Trikalsilite : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Trikalsilite Mineral Data : Ask about Trikalsilite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Español Print or Cut-and-Paste your Trikalsilite Specimen Label here : Trikalsilite (K,Na)AlSiO4 Dana No: 76.2.1.3 Strunz No: VIII/J.02-30 Locality:   Notes: