ZnS , FeS₂ , CaCO₃ - Mohs Hardness: 3½-4, 6-6½, 3. Sphalerite is the principle ore of zinc. In some localities, it occurs with significant amounts of the rare elements cadmium, gallium, and iridium, and it is also the main ore of those metals. Sphalerite is an important mineral to collectors, and some transparent varieties are occasionally faceted for collectors.
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