Gurasada agate
3
Coin
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Gurasada agate is a beautiful mineral specimen from the Gurasada region of Romania. Agate is a ribbon-shaped chalcedony (a subspecies of quartz), the strips of which can be parallel or concentric. This agate is usually embedded in diabase, a fine to medium-grained intrusive igneous rock that is usually dark gray to black in color. This polished agate specimen measures 9 x 8.5 x 8cm and has a chemical composition of silicon dioxide (SiO₂).
