Gregoryite Mineral Data Pronunciation Guide

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General Information
Chemical Formula:	(Na2,K2,Ca)CO3
Composition:	Molecular Weight = 115.06 gm)
	Potassium 20.39 % K
	Sodium 23.98 % Na
	Calcium 3.48 % Ca
	Carbon 10.44 % C
	Oxygen 41.71 % O
Empirical Formula:	0.6(Na2)0.3(K2)Ca0.1(CO3)
IMA Status:	Not IMA Approved
Classification
Dana Class:	14.1.2.2 (14)Anhydrous Carbonates
	(14.1)with Simple Formula A+ CO3
	(14.1.2)Dana Group
Strunz Class:	V/B.05-40 V - Nitrates, Carbonates and Borates
	V/B - Waterfree carbonates [CO3]2- without unfamiliar anions
	V/B.05 - Eitelie - Shortite - Carbocernaite series
Crystallography
Axial Ratios:	a:c = 1:1.26251
Cell Dimensions:	a = 5.215, c = 6.584, Z = 2; V = 155.07 Den(Calc)= 2.46
Crystal System:	Hexagonal - Dihexagonal Pyramidal H-M Symbol (6mm) Space Group: P63mc
X Ray Diffraction:	By Intensity(I/Io): 2.66(1) 2.61(0.75) 3.29(0.4)
Physical Properties
Color:	white.
Density:	2.27
Streak:	white
Other Information
References:	PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:	Links to other databases for Gregoryite :   1 -Athena Mineralogy   2 - EUROmin Project   3 -MinDat.org Location Data   4 -MinMax   5 -École des Mines de Paris Search for Gregoryite using: [ALTAVISTA] [All-The-Web] [EXCITE] [GO.COM] [GOOGLE] [Ixquick] [LYCOS] [LookSmart] [MAMMA] [MSN.COM] [NORTHERN LIGHT] [YAHOO] Visit our Advertisers for Gregoryite : The Arkenstone Fine Minerals John Betts Fine Minerals Dakota Matrix Minerals Excalibur Mineral Co. Exceptional Minerals Fabre Minerals OsoSoft Minerals Rare Minerals Tsumeb Minerals Dan Weinrich Fine Minerals Ask about Gregoryite here : Mindat.org's Discussion Groups Mindat.org's Collecting Discussion Group Mindat.org's General Discussion Group Mindat.org's Swap Shop Discussion Group Bob's Rockshop Rock Net Discussion Group Rockhounds Discussion Group on Yahoo Groups Ask-A-Mineralogist from the Mineralogical Society of America

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