Answer | Crossword Clue |
---|---|
sillimanite | An aluminosilicate mineral typically occurring as fibrous masses, commonly in schist or gneiss |
dumortierite | A rare blue or violet mineral occurring typically as needles and fibrous masses in gneiss and schist. It consists of an aluminum and iron borosilicate |
wollastonite | A white or grayish mineral typically occurring in tabular masses in metamorphosed limestone. It is a silicate of calcium and is used as a source of rock wool |
goethite | very common mineral, iron hydroxide, HFeO2, occurring in crystals, but more commonly in yellow or brown earthy masses: an ore of iron |