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<p>[QUOTE="Ownedbybear, post: 112723, member: 29"]Nope. Onyx is Silicon Dioxide, SiO2. <a href="http://www.mindat.org/min-2999.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.mindat.org/min-2999.html" rel="nofollow">http://www.mindat.org/min-2999.html</a> </p><p><br /></p><p>Marbles, including travertine, are an assortment of carbonate salts of calcium, CaCO3 with Calcium magnesium carbonate, sometimes, CaMg(CO3)2. </p><p><br /></p><p>So totally different. Calcite is often called onyx, but it isn't. It's calcium carbonate.</p><p><br /></p><p>Alabaster is CaCO4, calcium sulphate. it's a salt of sulphuric acid and has four O atoms. Sulphites are CO3 and only have three oxygen atoms. (As an aside, a sulphide is any metal/sulphur combo) . </p><p><br /></p><p>If I think long enough, I might even remember the chemical equations, but it's a few decades since I did this stuff![/QUOTE]</p><p><br /></p>
[QUOTE="Ownedbybear, post: 112723, member: 29"]Nope. Onyx is Silicon Dioxide, SiO2. [URL]http://www.mindat.org/min-2999.html[/URL] Marbles, including travertine, are an assortment of carbonate salts of calcium, CaCO3 with Calcium magnesium carbonate, sometimes, CaMg(CO3)2. So totally different. Calcite is often called onyx, but it isn't. It's calcium carbonate. Alabaster is CaCO4, calcium sulphate. it's a salt of sulphuric acid and has four O atoms. Sulphites are CO3 and only have three oxygen atoms. (As an aside, a sulphide is any metal/sulphur combo) . If I think long enough, I might even remember the chemical equations, but it's a few decades since I did this stuff![/QUOTE]
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