A very impressive and certainly hard to find GEM quality Cassiterite specimen from the famous Viloco Mine. This locality bears the unique distinction of producing the only GEM quality (facet grade) Cassiterites from any mine in Bolivia. Considering the millions of tons of tin ore that Bolivia has yielded, the fact that only one mine ever produced transparent Cassiterite is remarkable. A fine, sharp, lustrous, beautiful, well-formed cyclic twinned crystal group sits atop tan compressed rhomobohedra of Siderite to create a beautiful “black and tan” association piece. The most impressive aspect of the specimen is the fact that the Cassiterite is incredibly gemmy when backlit, showing a range of colors from a light golden hue to an amber-cognac shade, and even the highly desirable and rarely seen RED, which is virtually impossible to find at Viloco. The piece comes from my father’s collection, and was mined in the early 1980’s. His catalogue number (399) is still glued to the base of the specimen. A small nick on the back of the Cassiterite keeps the piece from being 100% perfect, but it’s such a great rarity to have colorful, gem quality Cassiterite with any associated species from Viloco, that the damage is easily forgiven. Better quality than the photos indicate, and certainly a step above the vast majority of Cassiterites from Viloco.
ex. Richard A. Kosnar collection
Locality: Viloco Mine, Loayza Province, La Paz Department, Bolivia
Specimen Size: 3.3 x 2.4 x 1.8 cm (miniature)
Largest Crystal: 2.2 cm
Shipping from United States
1-3 business days
Estimated shipping times
- North America : 2 - 5 business days
- Europe : 7 - 14 business days
- Australia, New Zealand and Oceania : 10 - 20 business days
- Asia Pacific : 7 - 14 business days
I'll do my best to meet these shipping estimates, but can't guarantee them. Actual delivery time will depend on the shipping method you choose.
Customs and import taxes
Buyers are responsible for any customs and import taxes that may apply. I'm not responsible for delays due to customs.
Returns & Exchanges
I gladly accept returns, exchanges, and cancellations
Just contact me within: 14 days of delivery
Ship items back to me within: 30 days of delivery
Conditions of return
Buyers are responsible for return shipping costs. If the item is not returned in its original condition, the buyer is responsible for any loss in value.
Questions about your order?
Please contact me if you have any problems with your order.
Last updated 3 July 2022.
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