Sources differ widely about the hardness of serpierite, giving values varying between 2 and it is not radioactive.
2.
Serpierite is a sky-blue coloured mineral, with a white or almost white lath-like or bladed crystals typically less than 1 mm long.
3.
Serpierite is a hydrated sulfate with the formula Ca ( Cu, Zn ) 4 ( SO 4 ) 2 ( OH ) 6.3H 2 O It belongs to the monoclinic crystal system, space group C2 / c . and isostructural with aldridgeite.
4.
Refractive index is inversely proportional to speed, so the refractive indices for the X, Y and Z directions increase from X to Z . For serpierite the orientation with respect to the crystal axes a, b and c is Y = b, Z = c and X is inclined to an at angle 24?
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