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would ammolite be considered organic? I would guess so, but can someone confirm that for me? --Africanuck 07:33, 9 March 2006 (PST)

confirmed --Doos 08:01, 9 March 2006 (PST)

Ok, glass is excluded but how about obsidian or moldovite? And how does opal fit into all of this, as it is not a crystalline structure? --Africanuck 14:41, 9 March 2006 (PST)

Obsidian and moldavite are natural glasses, so non-crystalline. Opal is non-crystalline aswell. The opposite of crystalline is "amorphous", glass and opal are therefor amorph (meaning no regular internal structure).