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, Ca<sub>2</sub>Fe<sup>2+</sup>Al<sub>2</sub>BOSi<sub>4</sub>O<sub>15</sub>(OH) iron rich, clove-brown, brown, plum-blue, pearl-gray
- Axinite-(Mg) or magnesioaxinite, Ca<sub>2</sub>MgAl<sub>2</sub>BOSi<sub>4</sub>O<sub>15</sub>(OH) magnesium rich, pale blue to pale violet; light brown to light pink
- Axinite-(Mn) or manganaxinite, Ca<sub>2</sub>Mn<sup>2+</sup>Al<sub>2</sub>BOSi<sub>4</sub>O<sub>15</sub>(OH) manganese rich, honey-yellow, clove-brown, brown to blue
- Tinzenite (CaFe<sup>2+</sup>Mn<sup>2+</sup>)<sub>3</sub>Al<sub>2</sub>BOSi<sub>4</sub>O<sub>15</sub>(OH) iron â manganese intermediate, yellow, brownish yellow-green
Axinite is sometimes used as a gemstone.
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