mineral

Druzy Quartz Geode (Oco or Moroccan variety)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White to colorless crystals inside a tan/brown chalcedony rind; Luster: Vitreous to sparkling (druzy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 (Mohs scale)
Luster: Vitreous to sparkling (druzy)

Identified February 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed by mineral-rich groundwater seeping into cavities (vesicles) within volcanic or sedimentary rock. The quartz crystals precipitate slowly over thousands to millions of years. Examples like this are typically found in Cenozoic era deposits.

Uses & applications

Used primarily for decorative jewelry (pendants, rings), crystal collections, metaphysical purposes, and as educational specimens for geology students.

Geological facts

A 'druse' or 'druzy' refers to a coating of fine crystals on a rock surface. The word 'geode' comes from the Greek word 'geodes,' meaning 'earth-like,' referring to their rounded, rock-like exterior that hides a crystal-filled interior.

Field identification & locations

Identify in the field by looking for rounded, hollow-sounding nodules with a bumpy exterior. They are commonly found in the desert regions of Morocco, Brazil (Oco geodes), and the midwestern United States. To collect, look for vugs or cavities in limestone or volcanic basalt basalt.

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