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Gemstones, Minerals & Fossils
Lapidary
Stones I have cut
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<blockquote data-quote="user 4386" data-source="post: 442857" data-attributes="member: 4386"><p>Peridot is a bit softer than quartz, tourmaline a bit harder than quartz (the difference is only 1 to 1.5, but the relative hardness to quartz makes it sensitive). Powdered peridot will give a browny colour in a flame , tourmaline always a really bright green (the boron in it). They have vastly different optical properties (except for refractive index).</p></blockquote><p></p>
[QUOTE="user 4386, post: 442857, member: 4386"] Peridot is a bit softer than quartz, tourmaline a bit harder than quartz (the difference is only 1 to 1.5, but the relative hardness to quartz makes it sensitive). Powdered peridot will give a browny colour in a flame , tourmaline always a really bright green (the boron in it). They have vastly different optical properties (except for refractive index). [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Stones I have cut
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