metamorphic
Pyrite-bearing metamorphic rock (likely schist or quartzite)
Mica/quartz-rich metamorphic matrix with pyrite (FeS₂), possibly chalcopyrite (CuFeS₂)
AI-generated identification · may be incorrectDark gray, strongly foliated or layered, with brassy metallic sulfide patches; likely Mohs 2–3 for mica-rich surfaces and 6–7 for quartz, with moderate-to-high specific gravity. Metallic luster and rusty weathering are typical; crystal structure is crystalline, but individual grains are not clearly visible.
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Physical properties
Dark gray, strongly foliated or layered, with brassy metallic sulfide patches; likely Mohs 2–3 for mica-rich surfaces and 6–7 for quartz, with moderate-to-high specific gravity. Metallic luster and rusty weathering are typical; crystal structure is crystalline, but individual grains are not clearly visible.
Formation & geological history
Formed when sedimentary or volcanic material was buried, heated, and compressed during regional metamorphism; sulfide minerals crystallized from hydrothermal fluids or metamorphic reactions. Exact age and locality cannot be determined from the photograph.
Uses & applications
Primarily a collectible or teaching specimen; pyrite-bearing rock may have limited scientific interest, while related schist and quartzite are used as decorative stone or aggregate.
Geological facts
The golden metallic areas may be pyrite or chalcopyrite, but color alone cannot distinguish them reliably. Pyrite commonly oxidizes to iron-stained brown or orange surfaces.
Field identification & locations
Look for planar foliation, glittering metallic grains, and a dark, dense matrix; a streak test, hardness test, magnetism check, and fresh break would improve identification. Similar specimens occur in metamorphic and hydrothermal belts worldwide.
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