mineral
Dendritic Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale); Color: Translucent gray or white with black/brown inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64.
- Hardness
- 6
- Color
- Translucent gray or white with black/brown inclusions
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Translucent gray or white with black/brown inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64.
Formation & geological history
Formed through the deposition of silica from groundwater in cavities of igneous rocks. The dendritic patterns are formed as manganese and iron oxides crystallize in a branching fashion between layers of chalcedony.
Uses & applications
Primarily used in jewelry (cabochons, beads, pendants) and as a collector's specimen. It is also common in lapidary arts and metaphysical practices.
Geological facts
Despite their plant-like appearance, the 'ferns' inside are actually inorganic mineral inclusions. Historically, it was known as the 'Stone of Plenitude' and associated with agricultural harvests.
Field identification & locations
Identify by its translucent body combined with dark, tree-like or moss-like organic patterns. It is frequently found in Brazil, India, Madagascar, and the USA (Montana). Field identification relies on hardness and the lack of distinct cleavage.
