This Specimen has been sold.
3.3" Botryoidal Prehnite Crystal Cluster - Connecticut
This is a really cool, green prehnite specimen from the O and G Southbury quarry in Connecticut. Aggregates of botryoidal prehnite crystals can be found along the entirety of what could be considered the top of the specimen.
Prehnite is a calcium aluminum silicate with the chemical composition Ca2Al(AlSi3O10)(OH)2. It generally occurs as volcanic cavity infillings, and typically is a shade between yellow and green, however colorless and blue specimens are not unheard of.