sedimentary
Jasper / Chert / Quartzite
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7, Color: Reddish-brown to orange, Luster: Waxy to dull, Crystal structure: Microcrystalline, Cleavage: None (conchoidal fracture), Specific gravity: 2.5-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7, Color: Reddish-brown to orange, Luster: Waxy to dull, Crystal structure: Microcrystalline, Cleavage: None (conchoidal fracture), Specific gravity: 2.5-2.9
Formation & geological history
Formed through the deposition of silica in sedimentary environments or hydrothermal alteration, often resulting in massive, opaque forms.
Uses & applications
Commonly used in lapidary for tumbling, carving, and ornamental pieces.
Geological facts
Reddish colors are typically due to iron oxide impurities (hematite).
Field identification & locations
Identify by its hardness (scratches glass), massive structure, opaque nature, and conchoidal fracture. Often found as water-worn pebbles in riverbeds or beaches.
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