Jasper
gem · common
Quick facts
- Formula
- SiO2
- Hardness
- 6.5–7
- Luster
- Waxy to dull
- Colors
- Red, brown, yellow, green, patterned
Opaque microcrystalline quartz, often iron-stained. A catch-all name when photos lack translucency clues.
Easy to confuse with agate (translucent bands) and chert/flint. Hold to a light: jasper stays opaque.
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