metamorphic
Green aventurine / epidote-bearing metamorphic rock
Likely chlorite- and epidote-rich schist or altered amphibolite; exact identification requires testing
AI-generated identification · may be incorrectDark green-gray, coarse-granular and weakly foliated, with rusty red-brown iron-oxide staining. Likely Mohs 6–7, vitreous to dull luster, dense, with no obvious cleavage visible; composition may include chlorite, epidote, amphibole, quartz, and feldspar.
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Physical properties
Dark green-gray, coarse-granular and weakly foliated, with rusty red-brown iron-oxide staining. Likely Mohs 6–7, vitreous to dull luster, dense, with no obvious cleavage visible; composition may include chlorite, epidote, amphibole, quartz, and feldspar.
Formation & geological history
Probably formed by regional metamorphism or hydrothermal alteration of mafic volcanic rock, with later oxidation producing the red-brown zones. Such rocks commonly formed during Precambrian to Paleozoic tectonic events, though age cannot be determined visually.
Uses & applications
Used mainly as a lapidary, ornamental, or teaching specimen; attractive pieces may be polished into cabochons or carvings, but it has little industrial value.
Geological facts
The green color may reflect chlorite, epidote, or actinolite rather than aventurine quartz. A precise name requires hardness, streak, magnetism, and thin-section or chemical analysis.
Field identification & locations
Common in metamorphic belts and hydrothermal zones worldwide, including India, Brazil, South Africa, and the Alps. Look for foliation, hardness near quartz, and green minerals intergrown with rusty weathering surfaces.
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