From:
gary grossman <grossman@zzzzzzzzz>
Date:
Mon, 24 Oct 2005 06:38:23 -0400
Subject:
blue alabaster
Hi Sue, I don't have much information on this stone other than its
ground up for gypsum board. Alabaster is gypsum and the formula is CaSO
4-2H2O -- its calcium sulphate IIRC. OTOH, onyx is calcite Ca(CO3),
which is a different stone entirely. Now it's possible that onyx is
ground up for gypsum board too and this is onyx -- someone with more
minerological knowledge on the list perhaps can provide that
information. cheers, g2
sue wrote:
Quoted text begins.sounds more like onyx than alabaster - same look harder stone.
End of quote.
--
Gary D. Grossman
G. Grossman Fine Art
http://www.negia.net/~grossman/
Distinguished Research Professor - Animal Ecology
Warnell School of Forest Resources
University of Georgia
Athens, GA, USA 30602
http://www.arches.uga.edu/~grossman/
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