Tangerine quartz is colored by a thin coating of iron oxides which give it its brilliant orange color. These may or may not be covered by an additional layer of clear quartz, which of course imparts extra durability. Regardless, such material isn't suitable for facet rough.
I'm not Dr. Hanneman, but my guess is no. Obsidian and moldavite are natural glasses cooled from molten rock--in obsidian's case, a component of rhyolitic magma, in moldovite's case a mixture of crustal rocks. Neither is pure silica (SiO2). In the case of obsidian, it is going to be a mixture largely of silica and feldspar, and with moldavite it's likely got even more stuff melted in. And, of course, if we're talking on a volume-by-volume basis, glass isn't arranged in an orderly crystal structure so it is less dense.
Joined: Thu Jun 03, 2010 1:49 pm Posts: 331 Location: South Africa
Thanks Scarodactyl and Barbara,
I don't have any info on % contents for any minerals, the only other candidate I could think of would be Coesite, not a gemstone though.
Hopefully Dr. Hanneman will shed some light, otherwise it will be like the color change Amethyst debate from some time ago, lost track of that one without the final coclusion.
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