Agate 2

**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