These Are the Most Expensive Gems and Minerals on Earth
Hilaire, of Quebec, Canada, this rare mineral was named after the family in Mont St. Hilaire, that operated the quarry in which this mineral was originally found. The astounding chemical formula for this mineral is KNa 2 B 3 Si 12 O 30 , which, in words, is Potassium Sodium Boron Silicate.