RGM Exotics

09/01/2015

Have you checked out our huge End of Summer Mineral Sale yet?!

Items in The San Francisco Bay Area’s premier dealer of fine and rare mineral specimen. store on eBay!

06/19/2015

What is the difference between rocks, gems and minerals? A mineral is a naturally occurring substance that is formed through geological processes with a specific chemical composition. A rock is an aggregate of minerals and does not need to have a special chemical composition. A gem is a mineral (or occasionally a rock) that has found favor among humans for its attractiveness, value, hardness and/or rarity.

05/15/2015

Did you know that the first mineral ever recorded in history was turquoise? It was used to create beads in Mesopotamia in 5000 B.C.

05/01/2015

Did you know that the famous Clara Mine was started in 1726 and is currently the only active mine in the Black Forest in Baden-Wurttemberg, Germany?

04/17/2015

Dioptase is a gorgeous green mineral and one of our personal favorites! Just a few Dioptase deposits have produced large crystals while most deposits only produce microcrystals.

04/03/2015

Did you know that the oldest rock fragment on Earth is over 4 billion years old?

By zapping single atoms of lead in a tiny zircon crystal from Australia, researchers have confirmed the crystal is the oldest rock fragment ever found on Earth — 4.4 billion years old.

03/20/2015

Did you know that the mineral Tourmaline is referred to as the "rainbow gemstone"? Tourmaline occurs in a wide variety of colors and some specimens also occur in a combination of colors.

03/13/2015

Did you know that Malachite has been called the "guardian stone" because throughout history some people came to believe that it could protect them from harm and bring about peace. Some even wore it as protection and believed that the stone would break into pieces if they were in danger.

02/27/2015

Did you know that ancient Greeks believed amethyst prevented drunkenness and would drink from goblets made of the stone?

02/20/2015

Did you know that only 15% of minerals have the ability to fluoresce, and of those minerals not every specimen will be fluorescent? We think that makes fluorescent minerals even more amazing!