Bismuth Crystal with Iridescent Oxide volcanoes The yellow color of the

The yellow color of the glass is due to a high concentration of lead-oxide (up to 70%)

Planets have enough mass to cause significant melting and separation of geologic material

Roman Bath

Above: Closeup of the reverse side of the tile

and frankly they are best displayed in the open

Bismuth Crystal with Iridescent Oxide volcanoes The yellow color of theAbove: Front of specimen card. "The Philosopher takes pleasure in the contemplation of the nature of these compounds while the miner takes pleasure in the profit and use he obtains from the metals he extracts from them." ~ Georgius Agricola, 1546 This specimen is a complete bismuth crystal. They are hand cast in Colorado by a family that specializes in creating bismuth crystals for the jewelry industry. We loved them so much that we had to share them