mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Clear to milky white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Clear to milky white
Luster: Vitreous (glassy)

Identified June 13, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Clear to milky white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed through the precipitation of silica-rich hydrothermal fluids or groundwater within cavities of volcanic or sedimentary rocks. This specimen likely comes from a geode or a quartz vein.

Uses & applications

Commonly used as decorative specimens, in jewelry as semi-precious stones, and in industry for glassmaking or silicon manufacturing.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Specimens like this often contain inclusions or are formed over millions of years as successive layers of minerals deposit on the walls of a cavity.

Field identification & locations

Identify in the field by its hardness (will scratch glass), glassy luster, and lack of cleavage. Found globally in almost all geological environments, particularly in mountain ranges and riverbeds.