A rare dark brown or black mineral consisting of a silicate of iron beryllium and rare earths

A rare dark brown or black mineral consisting of a silicate of iron beryllium and rare earths
Crossword Clue
**We have found 2 answers to crossword clue "A rare dark brown or black mineral consisting of a silicate of iron beryllium and rare earths"**
**The Best Answer: 10/10**
Answer	Crossword Clue
gadolinite	A rare dark brown or black mineral, consisting of a silicate of iron, beryllium, and rare earths
hornblendes	A dark brown, black, or green mineral of the amphibole group consisting of a hydroxyl alumino-silicate of calcium, magnesium, and iron, occurring in many igneous and metamorphic rocks

Crossword

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A rare dark brown or black mineral consisting of a silicate of iron beryllium and rare earthsCrossword Clue