mineral
Agate (Laguna or Lace variety pattern)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs); Color: Multi-colored banding (white, red, brown, translucent); Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64
- Hardness
- 6
- Color
- Multi-colored banding (white, red, brown, translucent)
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Multi-colored banding (white, red, brown, translucent); Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64
Formation & geological history
Formed in cavities (vesicles) of volcanic or metamorphic rocks through the deposition of silica from groundwater. This specific piece appears to be a seam agate or a fragment of a larger geode, often dating from various eras depending on the host rock.
Uses & applications
Primary uses include lapidary work (cabochons), jewelry, ornamental carvings, and collector specimens. Historically used for hardstone carvings.
Geological facts
Agate is a cryptocrystalline variety of silica, characterized by its fineness of grain and brightness of color. It is named after the Achates River in Sicily where it was first found in ancient times.
Field identification & locations
Identify by concentric or parallel banding and translucency when held to light. Found globally in volcanic regions like the American Southwest, Mexico, and Brazil. Collectors look for sharp banding and unique colors.
