Tritomite-(Ce) Mineral Data Pronunciation Guide

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General Information
Chemical Formula:	(Ce,La,Ca,Y,Th)5(Si,B)3(O,OH,F)13
Composition:	Molecular Weight = 787.79 gm)
	Calcium 10.17 % Ca
	Lanthanum 17.63 % La
	Cerium 26.68 % Ce
	Yttrium 3.95 % Y
	Thorium 4.42 % Th
	Silicon 8.91 % Si
	Boron 0.69 % B
	Hydrogen 0.38 % H
	Oxygen 22.34 % O
	Fluorine 4.82 % F
Empirical Formula:	5(Ce0.3)5(Ca0.4)5(La0.2)5(Y0.07)5(Th0.03)Si2.5B0.5O8(OH)3F2
Environment:	Nepheline Syenite.
IMA Status:	Approved IMA 1987
Locality:	Laven Island, Langesundfiord district, near Brevik, southern Norway.
Name Origin:	Named from the Greek for "three" and "to cut," in allusion to the trihedral cavities left in the host rock by the crystals.
Synonym:	Tritomite
Classification
Dana Class:	54.2.5.1 (54)Nesosilicate Borosilicates and Some Beryllosilicates
	(54.2)with B in [4] coordination
	(54.2.5)Tritomite group
Strunz Class:	VIII/B.33-40 VIII - Silicates
	VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron
	VIII/B.33 - Melanocerite-(Ce) - Tritomite-(Ce) series
Crystallography
Axial Ratios:	a:c = 1:0.73582
Cell Dimensions:	a = 9.35, c = 6.88, Z = 2; V = 520.89 Den(Calc)= 5.02
Crystal System:	Hexagonal - Dipyramidal H-M Symbol (6/m) Space Group: P63/m
X Ray Diffraction:	By Intensity(I/Io): 2.81(1) 1.84(0.4) 3.44(0.4)
Physical Properties
Cleavage:	None
Color:	dark brown.
Density:	4.2
Diaphaniety:	Translucent to Subopaque
Habits:	Pyramidal - Crystals are shaped like pyramids., Metamict - Mineral originally crystalline, now amorphous due to radiation damage.,
Hardness:	5.5 - Knife Blade
Luster:	Vitreous - Resinous
Optical Properties
Optical Data:	Isotropic, n=1.65-1.757.
Other Information
References:	NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:	Links to other data for Tritomite-(Ce) :   1 -Athena Mineralogy   2 - EUROmin Project   3 -MinDat.org Location Data   4 -MinMax Search for Tritomite-(Ce) using: [ALTAVISTA] [All-The-Web] [EXCITE] [GO.COM] [GOOGLE] [LYCOS] [LookSmart] [MAMMA] [MSN.COM] [NORTHERN LIGHT] [YAHOO] Visit our Advertisers for Tritomite-(Ce) : The Arkenstone Fine Minerals John Betts Fine Minerals Dakota Matrix Minerals Exceptional Minerals Fabre Minerals JCrystal Software OsoSoft Minerals Rare Minerals Tsumeb Minerals Dan Weinrich Fine Minerals

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