mineral
Agate
Agate (Silicon Dioxide, SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Translucent tan to light brown, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58–2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Translucent tan to light brown, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58–2.64
Formation & geological history
Formed as a secondary mineral in host rock cavities through the deposition of silica from groundwater; commonly found in volcanic and certain metamorphic rocks.
Uses & applications
Used in jewelry (cabochons, beads), decorative objects, precision pendulums, and industrial applications like mortar and pestles due to its hardness.
Geological facts
Agate is a variety of chalcedony. The name comes from the Achetes River in Sicily, where agates were first discovered in ancient times.
Field identification & locations
Identify by its waxy luster, translucency, and smoothness after being water-worn or tumbled. Common in riverbeds and beaches in volcanic regions.
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Nephrite Jade
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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