Azurite is a blue copper mineral with the chemical formula It forms monoclinic crystals. Azurite weathers into malachite. Azurite is used as a pigment, in jewelry, and as a decorative stone. This stone is called "Velvet Beauty" from Bisbee, Arizona.
this time we can observe growth structure (trigons) on a very deep green chrome crystal of Tourmaline. 350 ct and about 44 x 40 mm specimen. They are very diamond like termination. to be remembered that Tourmaline has a trigonal symmetry.