mineral

Quartz Geode

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White/Clear, Luster: Vitreous/Vaxy, Crystal Structure: Hexagonal (though internal crystals are often microcrystalline or drusy), Specific Gravity: 2.65

Identified June 20, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White/Clear, Luster: Vitreous/Vaxy, Crystal Structure: Hexagonal (though internal crystals are often microcrystalline or drusy), Specific Gravity: 2.65

Formation & geological history

Formed as hollow cavities in volcanic or sedimentary rocks where mineral-rich water seeps in over thousands of years, precipitating crystals onto the inner walls.

Uses & applications

Primary uses are for home decor, educational specimens, geological collection, and spiritual/metaphysical jewelry.

Geological facts

The word geode comes from the Greek word 'geodes' meaning earth-like. No two geodes are exactly alike, and they can range from the size of a marble to several meters long.

Field identification & locations

Look for heavy, round or egg-shaped stones that rattle when shaken or feel lighter than they appear. Often found in desert regions or limestone beds. Best identified by the crystalline cavity inside.