Word: feldspar
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Dates: during 1920-1929
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...lump of fused quartz, clear as water, turned purple; a lump of feldspar glowed blue, amber, ruby, amethyst, with patches of brilliant green, successively; a lump of limestone burned angry orange. After exposure to the rays, these minerals looked searing hot but were not. Their fluorescence was without rise in temperature and in some cases persisted for hours after the exposure (as displaced electrons worked slowly back to their places in the atoms). The application of heat and cold (liquid air) altered the speed and intensity of these effects. Diamonds were only temporarily affected by exposure...
...North Carolina local statesmen insist that the government should work at a process of recovering potassium from feldspar, a hard, glass-like composite of potassium salts with other minerals (aluminum and silicon). There are great beds of it in the green sands of New Jersey, the Cartersville slates of Georgia, and the leucite rocks of Wyoming. But the present cost of processing feldspar is far more than $40 a ton, the gage for fertilizer potassium...
...miners used used a cave in the cliff for a battery room and for a bomb proof shelter during the blasts. the specimens that are now being arranged for exhibition are largely specimens of feldspar quartz and spodumene. A number of specimens of pink afatite, a rare formation of granite, were found...