sedimentary/metamorphic
Jasper / Quartzite
SiO2
AI-generated identification · may be incorrectHardness 6.5-7, orange/red/brown colors due to iron oxide inclusions, massive or granular crystal structure, waxy to dull luster (shiny here due to being wet or tumbled), opaque to translucent.
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Physical properties
Hardness 6.5-7, orange/red/brown colors due to iron oxide inclusions, massive or granular crystal structure, waxy to dull luster (shiny here due to being wet or tumbled), opaque to translucent.
Formation & geological history
Forms from the consolidation of silica-rich sediments or the metamorphism of quartz-rich sandstones, often accumulating iron oxides during formation.
Uses & applications
Commonly collected as tumbled stones, used in landscaping, occasionally used in lapidary arts.
Geological facts
Jasper is an opaque, impure variety of silica. The colors are typically derived from mineral impurities like iron.
Field identification & locations
Found worldwide in riverbeds, beaches, and gravel deposits. Identified by its hardness (scratches glass) and conchoidal fracture.
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