Color: Rich Swiss Blue

The top of the specimen is covered with many sharp brassy pyrite crystals with some white dolomite

This is a very fine specimen of glassy

This phenomenon is known as "alexandrite effect

Olivine Volcanic Bomb | Lava Coated Crystal | 18 gr | Mortlake, Victoria, Australia | SO24 Indicolite Tourmaline Color: Rich Swiss BlueAn olivine volcanic bomb is a type of volcanic rock that contains olivine crystals and has been ejected during a volcanic eruption. Olivine is a mineral that is commonly found in the Earth's mantle and is one of the first minerals to crystallize as magma cools. Volcanic bombs are large clots of lava that are ejected from a volcano during an explosive eruption. They can vary in size, and their shapes are often streamlined due to their molten nature as