Description

Epidote is an abundant rock-forming mineral, but one of the secondary origin. Many of the characters of the mineral vary with the amount of iron present. Prismatic, columnar crystals, often shiny, finely striated faces. The color is green, gray, brown or nearly black but usually a characteristic shade of yellowish-green or pistachio green.

Axinite is a brown to violet-brown, or reddish-brown bladed group of minerals composed of calcium aluminium boro–silicate. Axinite is pyroelectric and piezoelectric.