A very common mineral in the open vein assemblage (and an accessory in the host metagabbro). Mostly small <1-1.5 cm crystals with wide variety of complex forms, Tessin and scepters, reverse scepters and combinations. Many are doubly-terminated. Larger crystals can reach up to 7 cm and are typically Tessin habit showing the various steep positive rhombohedra, such as {20bar21}, {30bar31} and {50bar53} and their negative equivalents {03bar32}, {02bar21}, {03bar31} and {05bar53}.
Habit:
Tessin habit, scepters, reverse scepters
Colour:
colorless to white, smoky
Quality for species:
Excellent - world class for species or very significant. (!!)
Becker Quarry, Willington, Tolland County, Connecticut, USA