Here we have a wonderful cabinet sized display specimen featuring fine quality, sharp, dark grey colored, pseudo-hexagonal crystals of Polybasite on all sides. At first glance, the underlying matrix appears to be crystals of Acanthite, but upon close inspection, you can see hundreds of tiny Polybasite crystals on the surface, which combined with the somewhat skeletal nature of the Acanthites makes be believe that these could actually be pseudomorphs of Polybasite after Acanthite. This is honestly the first time I’ve seen something like this from any locality in Mexico. I remember seeing some pseudomorphs of Polybasite replacing Pyrargyrite years ago from Guanajuato, but NEVER Polybasite after Acanthite. As mentioned, you need to look closely at the piece, and we’ve taken some micro photos to better illustrate that there are many tiny Polybasite crystals all over the piece, not the main group, which measures 2.0 cm across. A small coating of white Calcite can be seen in certain areas for a nice contrast of color. A really special and unique specimen that would make for a fantastic addition to any suite of sulfides/sulfosalts, silver-bearing minerals or minerals from Mexico.
Locality: Proaño Mine, Fresnillo, Fresnillo Municipality, Zacatecas, Mexico
Specimen Size: 10.3 x 6.3 x 6.1 cm (cabinet)
Largest Polybasite Crystal Group: 2.0 cm across (total width)
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
Request a cancellation within: 2 days of purchase
But please contact me if you have any problems with your order.
The following items can't be returned or exchanged
Because of the nature of these items, unless they arrive damaged or defective, I can't accept returns for:
- Custom or personalized orders
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.
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