Moorhouseite, CoSO 4 X6H 2 O is monoclinic with a=10.0, b=7.2, c=24.3A, beta =98 degrees 22'; alpha =1.470, gamma =1.496; meas. specific gravity 1.97. Aplowite, CoSO 4 X4H 2 O is monoclinic with a=5.94, b=13.56, c=7.90A, beta =90 degrees 30'; min. and max. indices of refraction are 1.528 and 1.536; measured specific gravity is 2.359.

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