mineral
Tree Agate
Silicon Dioxide (SiO2) with dendritic inclusions
Hardness: 6.5-7 Mohs; Color: White to milky translucent with dark green dendritic patterns; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Specific Gravity: 2.58-2.64.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: White to milky translucent with dark green dendritic patterns; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Specific Gravity: 2.58-2.64.
Formation & geological history
Formed through the cooling of silica-rich volcanic groundwater in rock crevices. The dendritic green patterns are formed by iron and manganese oxides or chlorite minerals that crystalize in tree-like patterns as the agate forms.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal collecting and metaphysical purposes.
Geological facts
Unlike 'Moss Agate' which is generally more translucent, Tree Agate is typically opaque white. Despite its name, the 'dendrites' are not fosslized plants but inorganic mineral tracks.
Field identification & locations
Identify by its characteristic 'forest-like' green branching patterns against a stark white background. Found globally with major deposits in India, Brazil, and the USA. Collectors look for high contrast between the white and green.
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