There are very few rheniim-bearing minerals. In fact there are only a couple. Here is one of them! The cavities in this fragment of basalt are loaded with thin, foil-like crystals of rheniite, that sort of resemble molybdenite. Rare and rich!
Note: All prices are in Canadian dollars (CAD). International customers are charged in CAD, exchange rate is calculated automatically by your bank/paypal upon checkout.