Tag: Bob Jones
Adamite & Legrandite from Mapimi
Adamite and legrandite from Mexico can now be added to most lists of classic minerals joining the ranks of silver from Kongsberg, Norway; proustite...
Meet the Quartz Mineral Group
The quartz mineral group includes some of the most common minerals on Earth occurring in almost every type of rock. It comes in five...
Why Minerals Have Color
Scientists have discovered several reasons why minerals have color. Some list as many as 13 different causes of color, but the great majority fall...
Exploring the Peridot Mesa Gem Mine
One of the richest and largest sources of peridot in the world is located in the heart of the San Carlos Apache tribal lands...
Cerussite: A Stunning Secondary Mineral
Cerussite is a transparent to translucent secondary mineral. When colorless, high lead content gives it brilliant luster and makes it the heaviest of all...
Wulfenite-Mimetite: A Breathtaking Combo
Wulfenite-mimetite specimens from Mexico’s San Francisco mine in Sonora are among the most beautiful in the world.
It's my favorite and I admit to being...
Pyrite: The Golden Iron Mineral
Pyrite appears in over a half dozen different forms, from simple cubes to complex twinned dodecahedrons, and is found in countless deposits all over...
Exploring Legendary Hard-to-Find Gold and Silver
By Bob Jones
Gold is a native element that resists forming mineral compounds. Of the several gold compounds, only two are sometimes available to collectors:...
R&G Revisited: Finding Favor With Ceruleite
Editor’s Note: This article, written by Bob Jones, originally appeared in the August 1976 issue of Rock & Gem.
I sure like blue gems, especially...
Think Zinc – The Mysterious Case of the Disappearing Metal
By Bob Jones
When you visit a mineral show and check a dealer’s stock, I’d like to recommend you “think zinc.” The metal comes in...
