Formula: CaB₂Si₂O₈

Species: Silicates – (Tectosilicates)

Colour: Pale yellow, yellowish-brown, colourless

Lustre: Vitreous, Greasy

Hardness: 7 – 7½

Specific Gravity: 2.93 – 3.02

Crystal System: Orthorhombic

Name: For the type locality at Danbury, Connecticut – USA.

Type Locality: Danbury, Fairfield County, Connecticut – USA

The calcium analogue of Maleevite and Pekovite.