From The Gemology Project
A brown sillimanite.
Photo courtesy of Chaman Golecha, Gem Testing Laboratory, Jaipur.
A fibrous sillimanite dyed red simulating a ruby. Such sillimanites are dyed in different colours to simulate various stones like ruby, sapphire, emerald and others.
By Chaman Golecha, Gem Testing Laboratory, Jaipur.
Rare, violet colored, chatoyant sillimanite cabochons.
Photo courtesy of Barbra Voltaire, GemologyOnline.com