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Cymrite
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<p>Cymrite is a <a href="/facts/Silicate_mineral/WclrQW2I">silicate mineral</a> with the chemical formula BaAl2Si2(O,OH)8·H2O. The mineral is named for Cymru, which is the <a href="/facts/Welsh_language/4Pz8r6yk">Welsh</a> word for <a href="/facts/Wales/xa3W6PHH">Wales</a>. </p><p>Cymrite, with perfect cleavage and a monoclinic crystalline system, falls in the silicate group. Silicates are formed of Silicon and Oxygen bonding together to form tetrahedra. The symmetry of Cymrite is classified as having a mirror plane. It has a moderate relief, meaning the contrast between the mineral and the epoxy of a thin section makes cymrite easily visible. The birefringence of the mineral is 0.01. Cymrite, being monoclinic is anisotropic with two optic axes. </p>