Rare mineral – Natural Andalusite from Sri Lanka

Colour : Orangish-Green

Shape : Cushion

Weight : 0.48 ct

Dimension : 4.57 x 4.51 x 3.34 mm

Treatment : Unheated

Clarity : VS

• GIC – Geological Institute of Colombo Certified

红柱石

重量 : 0.48 卡拉

尺寸 : 4.57 x 4.51 x 3.34 mm

颜色 : 橙绿色

透明 : 好透明

形状 : 靠垫形状

治療：没有加热

清晰度 : VS

Natural Andalusite – Rare Nesosilicates Gemstone

Andalusite is an aluminium nesosilicate mineral with the chemical formula Al2SiO5. Andalusite is isomorphic with kyanite and sillimanite, being the lower pressure mid-temperature polymorph.
Andalusite is a which forms under low pressure and low to high temperatures.

The minerals kyanite and sillimanite are polymorphs of andalusite, each occurring under different temperature-pressure regimes.
Sometimes, Fibrous inclusions in andalusites may create a chatoyant effect. However,andalusite cats eye is very rare.