mineral

Quartz with Iron Oxide Monzonite or Sandstone contact

Quartz (SiO2) with Limonite/Hematite staining

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale), Color: tan, orange-brown, and translucent white crystals, Luster: Vitreous to earthy, Crystal Structure: Hexagonal (though largely massive or fractured in this specimen), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified April 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes or silica-rich fluid precipitation in rock cavities. The orange staining is likely from the oxidation of iron-bearing minerals (limonite) over time.

Uses & applications

Quartz is used in glassmaking, electronics (piezoelectric properties), and as a semi-precious gemstone. This specific specimen is primarily for amateur geological collection.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Iron oxide staining, as seen here, is often referred to by collectors as 'rust' or 'golden healer' depending on the intensity and presentation.

Field identification & locations

Identify in the field by its hardness (will scratch glass) and lack of cleavage. Look for the crystalline, glassy structures under the coating. It is commonly found in mountain ranges and riverbeds globally.