... flame color. If this mineral is heated in a small bottle or phial, or what is called a closed tube, it decrepitates or breaks up with a crackling, popping noise, turns black, but becomes red, or its original color, upon cooling. This mineral is not... Practical Mineralogy Simplified: For Mining Students, Miners and Prospectors - Pagina 44 door Jesse Perry Rowe - 1911 - 162 pagina’s Volledige weergave -
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