Cassiterite on Quartz amber His catalogue number (1887) is

His catalogue number (1887) is still glued to the base of the specimen

Colorado was a prominent figure and collector of Colorado minerals

The back of the twin has a “rub” which keeps it from being completely perfect

making it even more enticing

especially pieces that are larger than thumbnails available on the market

Cassiterite on Quartz amber His catalogue number (1887) isThis particular piece is a superb quality Cassiterite from the standpoint of luster, sharpness and the fact that there are TWO distinct twinning habits on the same specimen. An impressive, classic, sharp, lustrous group of black to gemmy golden color cyclic twinned crystals sit atop prismatic white Quartz matrix. The most interesting aspect of the piece is the fact that there are a few RARELY seen drillbit habit twinned groups. Its not common to find