Dolomite and Quartz on Sphalerite Bismuth or native elements

or native elements

for years this material was referred to as "Hyalite" Opal

crystallized display specimens

If that wasn’t enough

golden-black "blades" of Goethite forming a beautiful crystallized

Dolomite and Quartz on Sphalerite Bismuth or native elementsA wonderful display specimen from the famous Black Cloud mine featuring highly vitreous rhombohedra of cream colored Dolomite some of which are oriented into a spherical aggregate at the top of the specimen which are sitting atop beautifully contrasting silvery blue Quartz on black Sphalerite matrix. Some minor associated Galena can be seen on the side of the piece as well. Its such a unique color combination and displays beautifully as you can see