pyrrhotite pyrrhotite is an iron sulfide mineral with the formula fe (1x) s (x = 0 to 0.2). it is a nonstoichiometric variant of fes, the mineral known as troilite.pyrrhotite is also called magnetic pyrite, because the color is similar to pyrite and it is weakly magnetic.the magnetism decreases as the iron content increases, and troilite is nonmagnetic. [page needed]
turquoise turquoise is an opaque, bluetogreen mineral that is a hydrated phosphate of copper and aluminium, with the chemical formula cu al 6 (po 4) 4 8 ·4h 2 o.it is rare and valuable in finer grades and has been prized as a gemstone and ornamental stone for thousands of s owing to its unique hue. like most other opaque gems, turquoise has been devalued by the introduction of treatments
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