the luster is waxy and silky
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All minerals have luster. There are different types of luster. Pyrite has metallic luster.
luster means dumbness.
The Luster of a mineral is it's appearance in the light. Also there are two types of Luster, metallic and nonmetallic.
Most onyx specimens contain bands of black and white, possibly with some shades of bluish-grey. The type of onyx called sardonyx features mostly red and yellow bands in various shades. Black onyx, although mostly black, also contains bands of various colors. Commercially available "black" onyx is often artificially colored.
Mineral!