Corundum (var: Sapphire) (Bi-color Twin) Bolivia metallic compressed rhombohedra of chocolate brown

compressed rhombohedra of chocolate brown (nearly black) Siderite on matrix

This specimen consists of pale yellow

This piece showcases the largest colorless to white Calcite rhombehedra that I have seen from this locality with excellent

Specimen #PREH31115

This beautiful specimen of Native Copper features a pleasing combination of defined "Spinel"-twins and well-formed crystals intergrown to create a display quality piece

Corundum (var: Sapphire) (Bi-color Twin) Bolivia metallic compressed rhombohedra of chocolate brownGood Sapphire crystals are hard to find, twins are even more rare, but finding true bicolor twins is off the charts. Now I say true bicolor twins, because I dont really count a twinned crystal with varying degrees of blue as being multicolored necessarily. Theres no mistake with this piece as the color contrasting is about a defined as it gets for Sapphire. Ive seen twinned Sapphires with blue and yellow hues in the same crystal, but I dont know if I