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Gold Prospecting
Hard Rock Gold Prospecting
Chunky Rock - ID Needed
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<blockquote data-quote="user 4386" data-source="post: 298108" data-attributes="member: 4386"><p>Almost certainly tourmaline, the variety known as schorl, and almost certainly not galena. You can scratch molybdenite with your fingernail, galena not with your fingernal but with a "gold" (i.e. $1, $2) coin, tourmaline not with a coin or a steel pocketknife but sometimes using quartz (with difficulty). Tourmaline also has a hardness that varies with the direction that you scratch (across or parallel to elongation). Powdered it (tourmaline) will probably turn a candle flame green (the others will melt and sputter). Molybdenite will leave bluish-black to black streaks when rubbed on the surface of broken porcelain, tourmaline will probably just scratch the porcelain rather than vice-versa.</p></blockquote><p></p>
[QUOTE="user 4386, post: 298108, member: 4386"] Almost certainly tourmaline, the variety known as schorl, and almost certainly not galena. You can scratch molybdenite with your fingernail, galena not with your fingernal but with a "gold" (i.e. $1, $2) coin, tourmaline not with a coin or a steel pocketknife but sometimes using quartz (with difficulty). Tourmaline also has a hardness that varies with the direction that you scratch (across or parallel to elongation). Powdered it (tourmaline) will probably turn a candle flame green (the others will melt and sputter). Molybdenite will leave bluish-black to black streaks when rubbed on the surface of broken porcelain, tourmaline will probably just scratch the porcelain rather than vice-versa. [/QUOTE]
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Gold Prospecting
Hard Rock Gold Prospecting
Chunky Rock - ID Needed
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