mineral
Chrysoprase- or serpentine-bearing quartz vein with pyrite
Quartz (SiO₂) with iron sulfide, chiefly pyrite (FeS₂), in altered Mg-rich rock; green material may be serpentine or nickel-bearing chalcedony
AI-generated identification · may be incorrectHardness is approximately 6–7 for quartz, 6–6.5 for pyrite, and 2.5–4 for serpentine; the specimen is pale green, white, gray, and brassy metallic, with granular to massive texture. Quartz is vitreous and non-cleaving; pyrite has a metallic luster and cubic crystal habit, though crystals here appear broken or granular.
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Physical properties
Hardness is approximately 6–7 for quartz, 6–6.5 for pyrite, and 2.5–4 for serpentine; the specimen is pale green, white, gray, and brassy metallic, with granular to massive texture. Quartz is vitreous and non-cleaving; pyrite has a metallic luster and cubic crystal habit, though crystals here appear broken or granular.
Formation & geological history
Likely formed in a hydrothermal vein or altered ultramafic rock, where silica- and sulfur-bearing fluids deposited quartz and pyrite. A precise geological age cannot be determined from the photograph; such assemblages occur from Precambrian to modern hydrothermal systems.
Uses & applications
Used mainly as a teaching or display specimen; quartz may have industrial value, while pyrite is collected for its metallic appearance. The green material could be ornamental if confirmed as high-quality chrysoprase, but this specimen appears chiefly mineralogical.
Geological facts
The brassy grains are consistent with pyrite, often called “fool’s gold”; copper sulfides can look similar, so chemical testing is useful. A streak test, hardness test, and acid reaction can help separate quartz, calcite, serpentine, and sulfides.
Field identification & locations
Commonly found in hydrothermal veins, shear zones, and serpentinized ultramafic terrains. Look for glassy quartz, green alteration minerals, metallic brassy grains, and a dark green-black streak or sulfide staining.
