Green Onyx look-alikes
Calcite (variety of banded calcite or travertine)
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Open the appSeveral rocks and minerals can be confused with Green 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
True Onyx
Chalcedony (SiO2)
Also known as: Sardonyx (if banded with red/brown)
Marble
Calcite (CaCO3)
Also known as: Crystalline Limestone
Travertine
Calcite (CaCO3)
Also known as: Tufa (less dense, porous variety)
Serpentine
Mg3Si2O5(OH)4
Also known as: Bowenite, Antigorite, Lizardite
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