Formula : Fe3+[OH/SO4] * 3 H2O
System: triclinic Hardness:2½ Rarity:rare
Strunz id:6/D.01-40 -
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
Name origin: From the Greek άμάραυτος = amaranth, in allusion to its common colour
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