Posted on 09/19/2014 7:39:28 PM PDT by JimSEA
Corundum is a rock-forming mineral that is found in igneous, metamorphic, and sedimentary rocks. It is an aluminum oxide with a chemical composition of Al2O3 and a hexagonal crystal structure.
The mineral is widely known for its extreme hardness and for the fact that it is sometimes found as beautiful transparent crystals in many different colors. The extreme hardness makes corundum an excellent abrasive, and when that hardness is found in beautiful crystals, you have the perfect material for cutting gemstones.
(Excerpt) Read more at geology.com ...
That is just lying around, there?
Wow!
/total rock hound
Beautiful.
Yeah, they’re pretty common all around lake superior but you have to be careful where you pick them up due to various federal state and local laws.
If Corundum is over 50% red it is Ruby... all other color are Sapphire. Fine Ruby is my favorite gem.
you rock!
Those are spectacular.
I know what that means! I didn’t learn this latin in private school though. Mad Michael Savage (himself!) translated this for me and other radio listeners years ago. It means “Don’t Let The Bastards Grind You Down!”
Petoskey stones are pretty cool as well. They’re actually fossil coral.
I’ve been to one played out mine in marble near Phrae, Thailand. My wife loves ruby and sapphire as well. The Thais craft their local designs in gold (24 Carat). They have some spectacular jewelry.
That’s nice work. There can’t be many of those around.
I’d rather have that than jade with no story to tell.
Sounds like the guy is a friend of the owner of Spyderco knives. He’s in SC but picked up the stone in Michigan and had it done so its a one of a kind job.
http://paulberetta.com/index.htm
He has lots of knives.
http://paulberetta.com/kiwimania/index.html
“...but you have to be careful where you pick them up due to various federal state and local laws.”
I try to follow all of the rules, but seeing such a bunch of pretty rocks, and perhaps not knowing exactly what the rules were, would I grab just one or not? Quite the condudrum.
I try to follow all of the rules, but seeing such a bunch of pretty rocks, and perhaps not knowing exactly what the rules were, would I grab just one or not? Quite the conundrum.
The Latin saying is also rendered as “Ne illegitimi non te carborundum”
(Double negative is correct in Latin, plus the second person singular as direct object).
“Semper ubi sub ubi”
;^)
A conundrum over corundum - quite understandable.
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