Tobelite Mineral Data Pronunciation Guide

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General Information
Chemical Formula:	(NH4,K)Al2(Si3Al)O10(OH)2
IMA Status:	Approved IMA 1982
Classification
Dana Class:	71.2.2a.7 (71)
	(71.2)Dana Type
	(71.2.2a)Mica Group (Muscovite subgroup)
Strunz Class:	VIII/H.10-20 VIII - Silicates
	VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups
	VIII/H.10 - Mica group, Muscovite series
Crystallography
Axial Ratios:	a:b:c =0.5807:1:1.1625
Cell Dimensions:	a = 5.219, b = 8.986, c = 10.447, Z = 2; beta = 101.31ø V = 480.43
Crystal System:	Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C2/m
X Ray Diffraction:	By Intensity(I/Io): 10.24(1) 3.408(0.6) 2.566(0.45)
Physical Properties
Cleavage:	[001] Perfect
Color:	yellowish green or pearly white.
Density:	2.58
Diaphaniety:	Transparent
Habits:	Massive - Fibrous - Distinctly fibrous fine-grained forms., Scaly - Morphology like fish scales.,
Hardness:	2 - Gypsum
Luster:	Vitreous (Glassy)
Streak:	white
Optical Properties
Optical Data:	Biaxial (-), a=1.555, b=1.575, g=1.581, bire=0.0260, 2V(Calc)=56, 2V(Meas)=28.
Other Information
References:	PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:	Links to other data for Tobelite :   1 -Athena Mineralogy   2 - EUROmin Project   3 -MinDat.org Location Data   4 -MinMax   5 -École des Mines de Paris Search for Tobelite using: [ALTAVISTA] [All-The-Web] [EXCITE] [GO.COM] [GOOGLE] [LYCOS] [LookSmart] [MAMMA] [MSN.COM] [NORTHERN LIGHT] [YAHOO] Visit our Advertisers for Tobelite : 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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