Green tourmaline

Green tourmaline from Brazil Size- 5.3cm x 2.7cm x 2.8cm Weight- 59g You will receive the item in the photo Green tourmaline is also known as verdelite. Crystal system- Trigonal (forming long slender to thick prismatic crystals,often with a distinctive rounded triangular cross-section and vertical striations.) Mineral class- silicate mineral group,specifically classified as a cyclosilicate ( complex boron silicate containing iron,aluminium,and other trace elements) Rock formation- Forms deep within the earth in igneous and metamorphic environments,most commonly in granite pegmatites,hydrothermal veins and metamorphic rocks like schist and marble. Hardness- 7-7.5 on the MOHs scale