▲▲▲ Black Silk Stone Geological Properties
Onyx is a form of chalcedony, which is microcrystalline quartz formed in the gas cavities of lava. Its multi-layered structure is similar to that of agates. As with any onyx, black silk stone is found worldwide.
Mineral Information: Oxide mineral
Chemical Composition: SiO2
Color: Opaque-gray / black
Hardness: 4 (Mohs)
Specific Gravity: 2.70
Refractive Index: 1.486 - 1.658
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- Please allow us to prepare the item and parcel between 1-5 working days.
- All items will be sent by Thai Registered Airmail. The delivery usually takes about 10 - 15 working days for parcel to arrive in most countries.