Muscovite var. Ball Peen Mica | Perky Box Specimen | Rare | Branchville, Connecticut Mordenite most of these fragments under

most of these fragments under 20 grams

The mine stands at the collision of the Indo-Australian and the Pacific tectonic plates

Albite is thought to help with decision-making

This is a great looking complete slice of the Thuathe H4-5 classified meteorite

Abitibi-Témiscamingue

Muscovite var. Ball Peen Mica | Perky Box Specimen | Rare | Branchville, Connecticut Mordenite most of these fragments underThis 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