mineral
Chalcedony with Druzy Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs; Color: White, tan, light brown; Luster: Waxy to vitreous; Crystal structure: Hexagonal (trigonal); Specific gravity: 2.6-2.64
- Hardness
- 6
- Color
- White, tan, light brown
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: White, tan, light brown; Luster: Waxy to vitreous; Crystal structure: Hexagonal (trigonal); Specific gravity: 2.6-2.64
Formation & geological history
Formed from silica-rich groundwater precipitating in cavities or fractures of volcanic or sedimentary rocks. This specimen shows a microcrystalline base with small surface crystal growth.
Uses & applications
Commonly used in jewelry (as a gemstone), lapidary art, and as a collectible specimen for geological enthusiasts.
Geological facts
The word 'chalcedony' is derived from the name of the ancient Greek town Chalcedon in Asia Minor. It is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite.
Field identification & locations
Identify in the field by its waxy luster, lack of cleavage, and ability to scratch glass. Commonly found in desert environments, riverbeds, and volcanic regions.
