sedimentary
Jasper Rose Quarts / Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite inclusions
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
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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.
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