Rock Identifier
Gray Agate with Druzy Quartz Geode (Cryptocrystalline Quartz (SiO2)) — mineral
mineral

Gray Agate with Druzy Quartz Geode

Cryptocrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

Mohs hardness: 6.5-7; Color: Gray, bluish-gray; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64

Hardness
6
Color
Gray, bluish-gray
Luster
Waxy to vitreous
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Physical properties

Mohs hardness: 6.5-7; Color: Gray, bluish-gray; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64

Formation & geological history

Formed in cavities of volcanic host rocks through the deposition of silica from groundwater. The internal cavity contains a druzy druse of tiny quartz crystals.

Uses & applications

Ornamental carvings, decorative items, jewelry, and metaphysical collecting.

Geological facts

Agate is a variety of chalcedony. This specific piece is a 'druzy agate', where the internal hollow of a geode has been exposed and carved into an owl shape.

Field identification & locations

Identified by its waxy luster, translucency, and the presence of micro-crystals in the pocket (vug). Common in Brazil, Uruguay, and India.

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