Muscovite var. Ball Peen Mica | Perky Box Specimen | Rare | Branchville, Connecticut Obsidian This is a great fragment

This is a great fragment of the NWA 1459  meteorite which is classified as a stone achondrite

It is amazingly light considering its mass of 89x57x9 mm

Age: Eocene (~54 million years)

Dimensions: 35x33x18 mm / 1

Muscovite var. Ball Peen Mica | Perky Box Specimen | Rare | Branchville, Connecticut Obsidian This is a great fragmentThis 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