Formula : NaCaCu5[Cl|(AsO4)4] · 5H2O
System: trigonal Hardness:1-1½ Rarity:rare
Strunz id:7/D.25-24 -
7 - PHOSPHATES, ARSENATES, VANADATES
Name origin: Named for Chester (Chet) S. Lemanski, Jr., a New Jersey, USA, collector and former President of the Franklin-Ogdensburg Mineralogical Society, board member and Vice President of the Franklin Mineral Museum, former hard rock miner (Sterling Mine, NJ) and professional investigator.
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