Quartz, variety Black Chalcedony
Jet black matrix suspends a gelatinous luster of bubbly quartz, a product of the famous Deccan Traps locality. This specimen is an excellent example with great isolation and damage-free crystals. On top of that all, it is cut to self stand.
This material can be called by its trade name, "Black Chalcedony."
From Maharashtra, India.