metamorphic
Copper-bearing metamorphic rock, likely bornite- or chalcopyrite-rich schist
Quartz–mica schist with disseminated copper sulfides; possible bornite (Cu₅FeS₄) and chalcopyrite (CuFeS₂)
AI-generated identification · may be incorrectHardness roughly 3–7 depending on minerals; metallic bronze-gold and reddish-brown patches in a foliated, sparkly matrix. Likely quartz and mica with sulfide grains; cleavage follows mica layers, and specific gravity is locally elevated by copper minerals.
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Physical properties
Hardness roughly 3–7 depending on minerals; metallic bronze-gold and reddish-brown patches in a foliated, sparkly matrix. Likely quartz and mica with sulfide grains; cleavage follows mica layers, and specific gravity is locally elevated by copper minerals.
Formation & geological history
Probably formed when copper-bearing hydrothermal sulfides were metamorphosed and recrystallized during regional mountain-building. The exact geological age cannot be determined from the photograph; such rocks occur in Precambrian through younger metamorphic terranes.
Uses & applications
Primarily a geological or mineral-collecting specimen; copper-sulfide-rich material may be associated with copper ore deposits but is not necessarily economic ore. Attractive polished pieces can be used decoratively.
Geological facts
The brassy metallic grains may tarnish to blue-purple or iridescent colors, especially if bornite is present. A streak, hardness, and chemical testing are needed to distinguish sulfides from mica and iron oxides.
Field identification & locations
Look for visible foliation, glittering mica, quartz, and dense brassy grains; a copper-red or black streak and metallic luster support sulfides. Common settings include metamorphosed volcanic or hydrothermal copper deposits; locality information would greatly improve identification.
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