Mineral
Agate
SiO2
Hardness of 6.5-7 on the Mohs scale. Color varies widely due to impurities. Waxy luster. Cryptocrystalline structure. No cleavage. Specific gravity of 2.58-2.64.
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Physical properties
Hardness of 6.5-7 on the Mohs scale. Color varies widely due to impurities. Waxy luster. Cryptocrystalline structure. No cleavage. Specific gravity of 2.58-2.64.
Formation & geological history
Forms in cavities of volcanic rocks or ancient lavas from silica-rich fluids. Can be found worldwide.
Uses & applications
Used primarily in jewelry, cabochons, carvings, and as a decorative stone. Also popular among mineral collectors.
Geological facts
Agate is a banded variety of chalcedony. The name 'agate' comes from the Achates River in Sicily, where it was first discovered. Many varieties exist, named for their appearance or location.
Field identification & locations
Identify by its waxy luster, hardness (scratches glass), and often banded or patterned appearance. Found in many locations, especially areas with past volcanic activity. Collectors often look for unique patterns and bright colors.
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Arenite (SiO2 based)
sedimentary
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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