1) Trigonal mineral
Found on
https://www.crosswordclues.com/clue/chalcophyllite
Cu18Al2(AsO4)3(SO4)3(OH)27·33(H2O) | molweight = | strunz = 08.DF.30 | dana = 43.5.14.1 | color = Blue-green to emerald-green | habit = Crystals platy and six-sided, also as rosettes, drusy, foliated or massive. | system = Trigonal, 3 2/m or {overline|3} | twinning = On {1010} as twin plane. | cleavage = Perfect on {0001} | fracture = Irregular |...
Found on
http://en.wikipedia.org/wiki/Chalcophyllite
No exact match found.
