Quartz with Iron Oxide Monzonite or Sandstone contact

Physical Properties

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

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.

Identified on: 4/14/2026

Mode: Standard