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**Chemical composition:** SiO₂
**Hardness:** 6‒7
**Density:** 2.5‒2.7 g/cm³
**Crystal symmetry:** Microcrystalline
**Luster:** Glassy, Waxy
**Info:** It is concentrically finely and coarsely layered variety of chalcedony (quartz). The distinctive, visible sign is the colorfulness. The most common coloration include white-gray, pale blue, orange-red and black.
## Keywords
mineral agate texture color ornamental stone semi-precious gemstone