mineral
Gemstone Tree Brooch (Agate and Quartz)
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, waxy to vitreous luster, microcrystalline quartz structure (chalcedony/agate), no true cleavage, specific gravity of approximately 2.60 to 2.65, multicolored ranging from orange, brown, and cream.
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Physical properties
Hardness of 7 on the Mohs scale, waxy to vitreous luster, microcrystalline quartz structure (chalcedony/agate), no true cleavage, specific gravity of approximately 2.60 to 2.65, multicolored ranging from orange, brown, and cream.
Formation & geological history
Formed through the deposition of silica-rich groundwater in cavities of ancient volcanic or sedimentary rocks, often over millions of years.
Uses & applications
Used primarily in decorative items, jewelry such as brooches, and as collectible ornamental pieces.
Geological facts
Tumbled stones like these are frequently shaped using rock tumblers to simulate natural water-worn pebbles before being handcrafted into decorative items like miniature gemstone trees or jewelry.
Field identification & locations
Easily identifiable by its characteristic waxy luster and conchoidal fracture. Agates and chalcedony are found globally, commonly in volcanic regions and river gravels.
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