mineral
Dendritic Agate
Chalcedony (Silicon Dioxide) with Manganese or Iron Oxide inclusions
Hardness: 6.5–7 (Mohs); Color: White, gray, or clear base with dark tree-like inclusions; Luster: Vitreous to waxy; Structure: Microcrystalline; Specific Gravity: 2.58–2.64
- Hardness
- 6
- Color
- White, gray, or clear base with dark tree-like inclusions
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 (Mohs); Color: White, gray, or clear base with dark tree-like inclusions; Luster: Vitreous to waxy; Structure: Microcrystalline; Specific Gravity: 2.58–2.64
Formation & geological history
Formed when manganese or iron-rich mineralized water seeps into fractures of chalcedony, depositing oxides in branching, tree-like patterns known as dendrites. Usually found in volcanic or metamorphic host rocks.
Uses & applications
Primarily used in lapidary arts as a gemstone for rings, pendants, and beads, and highly valued by collectors for its unique scenic patterns.
Geological facts
Despite being called 'moss agate' or 'dendritic agate', the patterns are not plant fossils (moss) but are actually purely mineral deposits of manganese or iron.
Field identification & locations
Identify in the field by its translucent body with distinct, fractal-like dark 'branches' inside. Common locations include Brazil, India, Madagascar, and the USA (Montana).
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