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Onyx is similar to travertine in the way it is formed, resulting from water dissolving existing limestone and re-depositing it as a new type of stone known as sinter. In limestone caves, onyx is formed by drip water, in the formation of stalagmites and stalactites. It is quartz crystals fused together into thin layers of stone. This stone is as well used as a mineral gem.

Onyx is a spongy brittle stone and is best suited for areas without hard wear. This beautiful stone is characterized by its translucence, and could in fact be backlit for remarkable and dramatic effects.

Onyx is a calcareous stone and prone to engraving and discoloration from acids such as ketchup, lemons, alcohol, and domestic cleaners. Great care is required to preserve the natural splendor of this stone. Similar to limestone, onyx is a softer stone best placed where it won't be used or ill-treated on a day to day basis. It is porous and requires sealing.


Physical Properties of Onyx

Onyx is a type of chalcedony, part of the quartz group. Like any other stones in the chalcedony family, onyx has a silky, waxy luster. Onyx can be found in a huge range of colors, often layered.

Specific Gravity: 2.58 - 2.64
Refractive Index: 1.55 - 1.54
Hardness: 6.5 - 7.0 on Moh's scale

This exotic natural stone conveys luxury and glamour. It is an exquisite and exclusive stone that has been used for centuries to decorate places of worship and ward off evil spirits. It is believed that it provides comfort, relieves stress, and calms down the heart and mind. The translucent splendor of this stone is its most exquisite characteristic..


The colors represented here are a sampling of available materials. Additional colors are available.

  Onyx Samples
Green Onyx in Houston offered by Cangelosi
Green Onyx
Arco Iris Onyx in Houston offered by Cangelosi
Arco Iris Onyx
Red Onyx in Houston offered by Cangelosi
Red Onyx
White Onyx
White Onyx


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