Highgrade Mexican Velvet Obsidian Rough Chunk! Agatized Coprolite Wyoming Turritella is a form

Wyoming Turritella is a form of fossil snails that has been highly silicated

this is from Madagascar

but still has some great cabbing potential if your willing to work around some defects

India Tree Agate is a form of moss agate found in India

but when cut the other way

Highgrade Mexican Velvet Obsidian Rough Chunk! Agatized Coprolite Wyoming Turritella is a formThis is one of the neatest purple velvet obsidians I have ever seen! It's almost too good to be true! Mexican Velvet Obsidian is a higher quality obsidian with loads of magnetite that create the velvet like pattern and flashes within! It often features many different colors, and it works into some truly amazing cabochons! It takes an excellent polish and generally cuts fracture free! They can also make awesome pendants or can be great for wire