Agate is characterized by its fineness of grain and brightness of color.  They are commonly associated with volcanic rocks and can be found in metamorphic rocks.  This mineral can be white, grey, blue, orange, red, yellow, or black. It has a moh's hardness of 6.5-7.  

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Related Terms

Carnelian - Chrysoprase - Jasper - Sard

Child Terms

Onyx