mineral

Quartz geode

Quartz, SiO₂; likely a chalcedony-lined geode with inward-growing quartz crystals

AI-generated identification · may be incorrect

White to colorless, vitreous crystals with a drusy interior; quartz hardness 7 Mohs, trigonal crystal system, no cleavage, specific gravity about 2.65. The outer rind appears gray and brown, likely chalcedony and host rock.

Identified October 5, 2026More mineral →

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Physical properties

Formation & geological history

Forms when mineral-rich fluids deposit silica inside a cavity in volcanic or sedimentary rock; later quartz crystals grow inward. Geodes form across many geological periods, so the specimen’s age cannot be determined from the image.

Uses & applications

Collected as a display specimen and sometimes cut or polished for decorative objects; quartz also has extensive industrial uses in glass, electronics, and abrasives.

Geological facts

The hollow interior formed as crystals lined a pre-existing cavity; the surrounding rind protected the crystals during formation.

Field identification & locations

Look for a rounded, rough outer shell and a hollow or crystal-lined interior; quartz geodes occur worldwide, including in Brazil, Uruguay, and the United States. This specimen’s white, rounded crystal aggregates may include chalcedony or another mineral, but the image alone cannot confirm them.