mineral
Agate
Agate (Cryptocrystalline Quartz)
Hardness 6.5-7, multicolored, vitreous luster, cryptocrystalline, no cleavage, specific gravity 2.58-2.64.
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Physical properties
Hardness 6.5-7, multicolored, vitreous luster, cryptocrystalline, no cleavage, specific gravity 2.58-2.64.
Formation & geological history
Forms in vugs or vesicles of volcanic rocks, or occasionally sedimentary rocks, through the deposition of silica from aqueous solutions.
Uses & applications
Used in jewelry, carved ornaments, and as a collector's item.
Geological facts
Agate is a banded form of chalcedony with varying amounts of impurities causing the banding.
Field identification & locations
Identified by its distinctive banding and hardness. Commonly found worldwide in volcanic areas. Tip for collectors: Look for colorful and intricate banding patterns.
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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