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Rock guide

Carnelian

gem · common

Quick facts

Formula
SiO₂
Hardness
6.5-7
Luster
Vitreous
Colors
Red, orange, brown

Carnelian is a variety of chalcedony known for its warm, reddish-orange hues. It has been used in jewelry and as a gemstone for thousands of years.

Look for its warm red to orange color and smooth, polished surface.

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