20hhgd.is ((QUARTZ, Fe-Mn OXIDES)), $20 MINIMUM BID, Banska Stiavnica, Slovakia, 4 x 2.5 x 2.5 cm, Miniature | |
Iridescent oxide coating on Quartz on this specimen of Quartz from Slovakia. ex Glen Davidson collection, ex Lavinsky Mineral Auctions specimen, ex Brian Kosnar collection. |