Mineral
Tree Agate
Silicon dioxide (SiO2)
Hardness of 6.5-7 on the Mohs scale. Opaque white chalcedony with green dendritic or moss-like inclusions. Vitreous luster.
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Physical properties
Hardness of 6.5-7 on the Mohs scale. Opaque white chalcedony with green dendritic or moss-like inclusions. Vitreous luster.
Formation & geological history
Formed in volcanic rocks through the deposition of silica from aqueous solutions, with secondary minerals (usually chlorite, hornblende, or other green minerals) creating the tree-like patterns.
Uses & applications
Primarily used as a lapidary material for jewelry, carving, and ornamental objects.
Geological facts
Tree agate is closely related to moss agate, but is distinguished by its opaque white base, whereas moss agate has a translucent or clear base.
Field identification & locations
Identified by its contrasting green 'tree' patterns against a solid white background. Commonly found in India, Brazil, Uruguay, and the USA. It takes a high polish and is popular among lapidaries.
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Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
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metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral