Quartz varieties and Onyx look-alikes
Quartz (SiO2) varieties and Onyx (SiO2)
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Open the appSeveral rocks and minerals can be confused with Quartz varieties and Onyx. Below are documented look-alikes and the features that tell them apart. Never rely on a single feature. Always check multiple properties.
Similar rocks to compare
Chalcedony
SiO2
Also known as: Agate, Jasper, Carnelian
Tourmaline
Complex borosilicate
Also known as: Schorl, Elbaite
Fluorite
CaF2
Also known as: Fluorspar
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