A metal found in South-West Africa, and known as 'zinc-blende,; produces a bright light wlien struck or rubbed, even under water.
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Press, Volume LXVI, Issue 20021, 1 September 1930, Page 13
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21Page 13 Advertisements Column 2 Press, Volume LXVI, Issue 20021, 1 September 1930, Page 13
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