| Answer | Crossword Clue |
|---|---|
| smaltite | A metallic-gray mineral consisting chiefly of cobalt arsenide, typically occurring as cubic or octahedral crystals |
| rhodochrosite | A mineral consisting of manganese carbonate, typically occurring as pink, brown, or gray rhombohedral crystals |
| spinels | A hard glassy mineral occurring as octahedral crystals of variable color and consisting chiefly of magnesium and aluminum oxides |
| tetrahedrite | A gray mineral consisting of a sulfide of antimony, iron, and copper, typically occurring as tetrahedral crystals |
