Ashoverite, a new mineral, and other polymorphs of Zn(OH)2 from Milltown, Ashover, Derbyshire
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چکیده
Four polymorphs of Zn(OH)2 have now been recorded from an oxidised vein exposure near Milltown, Ashover, Derbyshire; sweetite, wfilfingite, ~,-Zn(OH)2, and ashoverite. The last is a new mineral, a tetragonal modification of Zn(OH)2 containing minor quantities of Pb, Cd and Ca. Its unit cell dimensions are a 6.825(2) and c 33.36(4)A, giving V = 1554A3; Z = 32; space group 141/amd, 141 md, or I7~2d; D . . . . . 3.3, Dr 3.44 g c m 3. Ashoverite occurs as colourless platy crystals associated with fluorite; it is uniaxial positive with co 1.629(2), e 1.639(2). The chemical composition of sweetite is compared with that of ashoverite.
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