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July 7 , 2018, Weekly Geology Guess, Zeolites

July 7, 2018
Greetings from the Bluff Park Back Porch, way up yonder on Shades Mountain (1,109′) in Alabama:
 
Our final industrial mineral is zeolite.
 
Zeolites are microporous, aluminosilicate minerals commonly used as commercial adsorbents and catalysts.[1]
 
 
Natural zeolite with a United States one-cent coin (penny) for scale
 
 
A form of thomsonite (one of the rarest zeolites) from India
Rob Lavinsky, iRocks.com
 
 
Natrolite from Poland
Kluka assumed (based on copyright claims).
 
 
Synthetic zeolite
SeaterrorOwn work
 
 
 
Polished thomsonite Gemstone
Rob Lavinsky, iRocks.com
Thomsonites, one of the rarer zeolite minerals, have been collected as gemstones from a series of lava flows along Lake Superior in Minnesota and to a lesser degree in Michigan, U.S. Thomsonite nodules from these areas have eroded from basalt lava flows and are collected on beaches and by scuba divers in Lake Superior.
These thomsonite nodules have concentric rings in combinations of colors: black, white, orange, pink, purple, red, and many shades of green. Some nodules have copper inclusions and rarely will be found with copper “eyes”. When polished by a lapidary the thomsonites sometimes display a “cat’s eye” effect (chatoyancy).[25]
 
A rich combination specimen of 4 zeolite species from a classic, now hard-to-access zeolite locale in Canada. The radiating natrolite crystals are protected in a pocket with associated stilbite. The matrix around and above the pocket is lined with small, stable, pink-colored laumontite crystals (this is an unusual color). Heulandite, rare for the locale, is also present as a crystal cluster on the backside. Ex. Harold Urish Collection.
Rob Lavinsky, iRocks.com
Enjoy the adventure!

AND NOW INTO THE DARK ENLIGHTENED WORLD OF MEDICAL GEOLOGY.
 
We will start with eatin’ rocks.

Thanks,
 

R
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