| Answer | Crossword Clue |
|---|---|
| magnesian | (chiefly of rocks and minerals) Containing or relatively rich in magnesium |
| calcic | (chiefly of minerals) Containing or relatively rich in calcium |
| aluminous | (chiefly of minerals and rocks) Containing alumina or aluminum |
| phlogopite | A brown micaceous mineral that occurs chiefly in metamorphosed limestone and magnesium-rich igneous rocks |
| mafic | of, relating to, or being a group of usually dark-colored minerals rich in magnesium and iron |
