Bismuth Crystal with Iridescent Oxide volcanoes This Knightia proved to be

This Knightia proved to be too large to swallow and the larger fish died as a result

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

this genus of towering sauropods grazed high and low from ginkgos

and frankly they are best displayed in the open

Like other members of the Ceratopsid family

Bismuth Crystal with Iridescent Oxide volcanoes This Knightia proved to beAbove: 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