mineral

Quartz geode / quartz vein fragment

Quartz (SiO₂), likely drusy and massive quartz with minor iron-oxide staining

AI-generated identification · may be incorrect

Hardness 7; white to translucent, vitreous luster, typically hexagonal quartz crystals, irregular fracture, no cleavage, specific gravity about 2.65. The specimen shows numerous small sparkling quartz crystals lining cavities.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited quartz in a gas cavity, fracture, or vug, commonly within volcanic rock or hydrothermal veins. The exact geological age cannot be determined from the photograph.

Uses & applications

Used for mineral collecting, décor, and lapidary work; quartz is also important in glass, electronics, abrasives, and construction. This rough fragment has modest specimen value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Iron oxides account for the yellow-brown staining visible near parts of the specimen.

Field identification & locations

Identify by its glassy sparkle, high hardness, lack of cleavage, and six-sided crystal forms; it should scratch ordinary glass. Common sources include Brazil, Uruguay, Mexico, the United States, and hydrothermal districts worldwide.