sedimentary

Jasper Rose Quarts / Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

AI-generated identification · may be incorrect

Hardness: 7 (Mohs); Color: Red, orange, white, and translucent; Luster: Vitreous to waxy; Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs)
Color: Red, orange, white, and translucent
Luster: Vitreous to waxy

Identified July 18, 2026More sedimentary →

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Physical properties

Hardness: 7 (Mohs); Color: Red, orange, white, and translucent; Luster: Vitreous to waxy; Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the deposition of silica-rich fluids in rock cavities or veins, with the red coloration caused by iron oxide (hematite) impurities. Often found as water-worn pebbles in riverbeds or coastal areas.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons), as decorative stones, and by mineral collectors for its aesthetic patterns.

Geological facts

Ferruginous quartz is often called 'Eisenkiesel' in German. The red color is not just a surface stain but is typically distributed throughout the silica structure as microscopic inclusions.

Field identification & locations

Identify by its hardness (will scratch glass), translucent quartz areas mixed with opaque red jasper parts, and lack of cleavage. Often found in gravel pits, river basins, and areas with volcanic activity history.