sedimentary
Snakeskin Agate
Microcrystalline Quartz (SiO2) with chalcedony inclusions
Hardness: 6.5-7 Mohs, Color: tan to creamy white with scales-like patterns, Luster: waxy to vitreous when polished, Crystal system: Trigonal (microcrystalline)
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 Mohs, Color: tan to creamy white with scales-like patterns, Luster: waxy to vitreous when polished, Crystal system: Trigonal (microcrystalline)
Formation & geological history
Formed within volcanic and sedimentary rocks as silica-rich water fills cavities. The unique snakeskin pattern is often enhanced through weathering or chemical etching on the surface layer.
Uses & applications
Primarily used as a decorative stone, in jewelry (beads, cabochons), and as a popular specimen for crystal collectors.
Geological facts
The 'snakeskin' appearance is caused by natural surface relief or contrasting chalcedony patterns. It is frequently sourced from Oregon, USA.
Field identification & locations
Identified by its distinctive tan or beige skin and translucent greyish-blue or white 'scale' patterns. Collectors should look for the characteristic brain-like or scaly texture on the unpolished surface.
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