Lithium Tantalate Faceted Stones, Sparkly Tantalia Loose Gems Gem:Round, 3mm, 0.25ct This is a zincite crystal

This is a zincite crystal that I faceted

When it's grown with industrial purity

and various doped versions are used as phosphors - if you have an old oscilloscope

This material cuts bright

Lithium Tantalate Faceted Stones, Sparkly Tantalia Loose Gems Gem:Round, 3mm, 0.25ct This is a zincite crystalThese are lab created white lithium tantalate gems. Lithium tantalate (LiTaO3) is an old rarity of the gem world and rarely seen today outside of industry. It was briefly used as a diamond simulant and marketed as 'tantalia', but was never very successful tantalate is much brighter and more dispersive than a diamond,so there was an obvious difference when cut. Faceted lithium tantalate gems give off brilliant rainbows of color, so it's an amazing gem