Re: Re: Re: Re: Rock I.D. Tony P.
Ward, if you find your ashtray have a close look and maybe do a scratch test in an inconspicuous place, you will probably find its the same stuff. I have a couple of "Onyx" eggs from somewhere in South America which are Calcite. A lot of travertine/flowstone/ Calcite nick nacks are churned out and labelled Onyx in poorer countries. It is quite common because limestone quarries often uncover caverns with stalactites and flowstone formations which have attractive banding, also it is fairly soft and easily worked which is ideal for a cottage industry.
From Paul - June 07, 2011 at 14:50:13