mineral
Dendritic Agate or Merlinite (Polished Cabochon)
Silicon dioxide with manganese or iron oxide inclusions (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, typically white or gray base color with black or dark gray branching/moss-like (dendritic) inclusions. Luster is vitreous to waxy when polished. Cryptocrystalline structure.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, typically white or gray base color with black or dark gray branching/moss-like (dendritic) inclusions. Luster is vitreous to waxy when polished. Cryptocrystalline structure.
Formation & geological history
Formed in cavities of volcanic rocks or associated with hot springs. The dendrites are formed by manganese or iron oxides crystallizing within fractures in the chalcedony.
Uses & applications
Commonly cut and polished into cabochons for jewelry, such as pendants. Also collected for its unique patterns.
Geological facts
Dendritic agate is often called the 'tree stone' because its inclusions look like ferns or branches, though they are entirely inorganic.
Field identification & locations
Identified by its contrasting dark, branching patterns against a lighter chalcedony background. Found in places like India, Brazil, and the USA.
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