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.

The axinite group includes:
Axinite-(Fe) or ferroaxinite, iron rich, clove-brown, brown, plum-blue, pearl-gray.
Axinite-(Mg) or magnesioaxinite, magnesium rich, pale blue to pale violet; light brown to light pink.
Axinite-(Mn) or manganaxinite, manganese rich, honey-yellow, clove-brown, brown to blue.
Tinzenite, iron – manganese intermediate, yellow, brownish yellow-green.

Axinite sometimes used as a gemstone.

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