Mineral
Agate
SiO2
Hardness 6.5-7 on Mohs scale, waxy to dull luster, microcrystalline structure, transparent to translucent, no cleavage, specific gravity 2.58-2.64. Beautifully banded in this specimen with blue, white, and brown colors.
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Physical properties
Hardness 6.5-7 on Mohs scale, waxy to dull luster, microcrystalline structure, transparent to translucent, no cleavage, specific gravity 2.58-2.64. Beautifully banded in this specimen with blue, white, and brown colors.
Formation & geological history
Formed in volcanic rocks or ancient lavas, in cavities produced by gas bubbles, where silica-bearing waters deposited microscopic quartz crystals in concentric layers over time.
Uses & applications
Used primarily in jewelry, ornamental carvings, and occasionally in industry for precision parts like mortar and pestle sets due to its hardness and resistance to chemicals.
Geological facts
Agate is known for its incredible variety of colors and banding patterns. It has been used historically as amulets and ornaments since ancient times.
Field identification & locations
Identified by its distinctive banding, waxy luster, and hardness. Often found in volcanic areas worldwide. Collectors value unique patterns and vibrant natural colors.
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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