Mineralpedia Details for Lemanskiite

Named for Chester S. Lemanskii as former President of the Franklin-Ogdensburg Mineralogical Society, board member and former Vice President of the Franklin Mineral Museum, former hard rock miner, and professional investigator. Appears as dark to sky-blue translucent rosette shaped aggregates of lamellar, sub-parallel, strongly bent intergrowths. Found at the type locality, in association with lammerite, olivenite, mandfieldite, and senarmontite, at the El Guanaco mine in the Antofagasta region of Chile. There are several other known localities of Lemanskiite.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)

IMA/CNMNC List of Mineral Names (2009) and Canadian Mineralogist 22 (2006), 523

Formula

NaCaCu₅(AsO₄)₄Cl·5H₂O 

Crystal System

Tetragonal 

Crystal Habit

Rosette, Aggregates 

Cleavage

Perfect, None, None 

Luster

Vitreous (Glassy) 

Color

dark blue 

Streak

light blue 

Class

Tetragonal - Trapezohedral 

Fracture

Brittle 

Hardness

2.5 

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Special Info

Type Locality, Phillips Collection

Bright blue foil crystals of rare Lemanskiite with earthy dull Lavendulan matrix.