Hackmanite Hackmanite is a rare sulfur-rich variety of sodalite and a tenebrescent mineral, which means that it has the ability to change color when exposed to sunlight. This is a process that reverses when the light changes. This phenomenon is also referred to as reversible photochromism. Hackmanite gems are pale to deep violet when first mined, and fade to grayish or greenish-white once exposed to sunlight. However, hackmanite gems from Afghanistan and Myanmar do the opposite and usually change from colorless or creamy-white to pink-red or violet under sunlight.
Certified Customer Reviews
Overall Rating -> 10
man their gems are pretty good, and the prices aren't to bad either, I like checking out hte gems on there website, beceause the pictures of the gems are taken pretty well, and you can see the table, and the facets.
I love gemselect and I have bought a fair amount from them. The only complaint I have is not being able to save gems. I have a lot of projects so i am in the market for a lot of different gems and it's so disappointing to have to delete them all just to purchase one or two that I have saved in my cart.