Cassiterite with Siderite and Quartz cabinet It should be noted that

It should be noted that the tip of the Quartz crystal is actually purple Amethyst(

This specimen is from the 2009 finds in the Machacamarca mining district in Bolivia

and you can spend a great deal of time looking at it under magnification to see all of the impressively well-preserved insects inside

but it appears that the rich color is due to a micro coating of transparent Quartz on top of the Vauxite

Cassiterite with Siderite and Quartz cabinet It should be noted thatThe quality of the Cassiterites on this specimen is outstanding. Theyre very sharp, smooth and lustrous, and good sized for the material! Several fantastic, very sharp, eye catching, highly lustrous, jet black to golden colored, amazingly well formed cyclic twinned crystals are aesthetically intergrown with tan compressed rhombohedra of Siderite. There are actually a few small Quartz crystals on the piece as well for a final touch. Very minimal