Bolivia has probably produced more tin than any other country in the world. The great tin mines at Viloco (sometimes called Araca) have produced some of the most magnificent Cassiterite specimens extant. This particular specimen consists of several fine, sharp, highly lustrous, gemmy brown color, cyclic twinned crystals measuring up to 1.7 cm on Quartz matrix. This is a very attractive piece and one of the better ones for aesthetics that I've seen in recent years. There is virtually no damage to the specimen, and it is a great display piece. This classic material from Viloco is simply not seen for sale in today's market. 4.5 x 3.1 x 3.1cm