Marcasite Plume Agate Slab - Black Plume with Blue Agate darker complexion The flowing grey patterns create

The flowing grey patterns create a unique visual effect in this rare California obsidian

The last photo is a representation of what the mosasaur may have looked like based on modern scientific data

and Blue Mountain Jasper in terms of collector and lapidary prestige

🌋 Mexican Velvet Obsidian – 💎 Cut Face

Marcasite Plume Agate Slab - Black Plume with Blue Agate darker complexion The flowing grey patterns createMarcasite Plume Agate Slab Black Plume with Blue Agate Old Stock Mystery Material This very neat slab of black marcasite features tons of plume action with blue agate and attractive druzy pockets throughout. The slab has exceptional cabbing potential, and with so many plumes it will produce some spectacular cabochons or a gorgeous display piece. This is an old stock slab from an old collection, and while the exact locality is uncertain, it appears to