Muscovite var. Ball Peen Mica | Perky Box Specimen | Rare | Branchville, Connecticut Obsidian Dimensions: 35x33x18 mm / 1

Dimensions: 35x33x18 mm / 1

Reverse of coin has a seal of the Liberia Government and notes its value

there are beautiful iridescent olivine crystals growing on the outside of the lava crust

This is a stunning Canyon Diablo classified meteorite specimen weighing 11

This is a lovely fan shaped stilbite specimen

Muscovite var. Ball Peen Mica | Perky Box Specimen | Rare | Branchville, Connecticut Obsidian Dimensions: 35x33x18 mm / 1This is a natural "Ball Peen" Mica specimen from Branchville, Connecticut. Instead of forming flat, book like sheets as muscovite usually does, mica specimens from the Branchville Mica Mine develop a rounded, bulbous termination resembling the rounded end of a ball peen hammer, from which its name is derived. The Branchville Mica Mine, which has been inactive since 1944 and is mostly flooded, is one of the most historically important mineral