Agate is the banded variety of chalcedony, which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.

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Onyx primarily refers to the parallel-banded variety of chalcedony, an oxide mineral. Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands; agate has curved bands while onyx has parallel bands.

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Soapstone is relatively soft because of its high talc content. Softer grades may feel similar to soap when touched, hence the name.

Becuase of its Softness Soapstones can be easily scratched. however they are very dense and extremely stain resistant.