Deep blue crystals of Clinoclase over green Cornubite from the now defunct Majuba Hill Mine. Both the front and back have great crystals and display equally well.

Deep blue crystals of Clinoclase over green Cornubite from the now defunct Majuba Hill Mine. Both the front and back have great crystals.

Single Benitoite with 'textbook' form. Benitoite is the only mineral that crystallizes in the trigonal bipyramidal form, a form that was only hypothesized prior to it's discovery. Here you have a perfect example of the rare form (and a rare mineral). It looks almost like a crystal model. Thick and complete all around, with Crossite inclusions.

Single Benitoite with near 'textbook' form and Crossite inclusions. Benitoite is the only mineral that crystallizes in the trigonal bipyramidal form, a form that was only hypothesized prior to it's discovery. Here you have a perfect example of the rare form (and a rare mineral). There is one natural step growth on the back of one corner, otherwise is perfectly symetrical on both sides.

Large specimen of interlocking and individual 'cogwheels' of Bournonite associated with black Sphalerite crystals and minor amounts of Pyrite and Quartz crystals.  A very rich sample loaded with Bournonite.  Ex. Chuck Trantham collection.