Mimetite Mimetite is a secondary mineral which is found in lead deposits where it forms during the oxidation process of the lead. Deposits have been found in South Africa, Namibia and Zimbabwe. Mimetite is known to be found in yellow, blue, brown and yellow mixed with...
Tourmaline Tourmaline is the name given to a group of 14 minerals of which elbaite and schorl are the most common. Tourmaline can be found in South Africa, Namibia, Zimbabwe Mozambique and Swaziland. Tourmaline is found in a wide spectrum of colours ranging from...
Epidote Epidote can be tea coloured to yellowish green, green and brown. It occurs in many forms, mostly in metamorphosed calcium rich rocks but also known in pegmatites. Chemical Formular : {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH) Refractive Index : 1.73 – 1.76...
Prehnite Prehnite can be found in various forms from botroidal, globular, granular and compact but it is seldom found in crystal form. Colour varies from transparent, white, yellow, yellow-green and it has a pearly lustre. Chemical Formular : 2Si3O10(OH)2 Hardness :...
