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...
Chrysocolla Chrysocolla is most often found in botryoidal or bubbly crusts. The colour is typically blue, bluish-green and it has a waxy lustre. Chemical Formular : Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O Hardness : 2.5 – 3.5 on the Mohs Scale Crystal System :...
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 :...
