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JoeM
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Hematite
Feb 10th, 2024 at 4:06pm
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Because it is found EVERYWHERE, in one form or another, at first I quickly got tired of constantly having to settle on Hematite as the identification of my newly found mineral specimens. I wanted it to be something else,...something different for a change.
But as time goes on you learn to give credit where credit is due.

I recently read an article about Hematite by Steve Voynick in the current issue of "Rock and Gem". and,  as usual, learned a lot and it is well worth reading. I'm going to ad-lib a few points he made in the article.

Hematite has two basic forms; crystalline and particulate. The crystalline form is the shiny black form that we get tired of finding all the time and wish it could be something else. And the particulate form is basically red, like the red hematite included quartz crystals we see occasionally.
In his article,  Mr. Voynick, describes a basic scale for the different colors in quartz and chalcedony caused by particulate hematite.

Particle size of less than 0.1 micron are orange. Like the orange to light tan color we see in many Carnelian agates, etc.
0.1-0.5 micron particles are a rich red color.
Particles 1-1.5 microns appear purple, like some fine grained Specularite, and particles 1.5 microns and larger start to take on the shiny black reflection of crystalline Hematite.

I have simplified this scale but thought it was worth posting since we often wonder what is causing the color in quartz and chalcedony.
I highly suggest you read the whole article in the January/February 2024 Rock and Gem magazine.
  
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Scott LaBorde
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Re: Hematite
Reply #1 - Feb 12th, 2024 at 9:34am
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Very interesting information. Thanks for sharing that. NC seems to be rich in hematite or ilmenite and we get so used to seeing it we kind of lump it all together. It's interesting though that the size of the inclusion has such a significant effect on color.  Between goethite, lepidocrosite, particulate hematite, specularite, and iron rich cacoxenite, it can be overwhelming to keep up with all of it. Sure would be nice to have my own personal x-ray diffraction analysis machine.
  

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JoeM
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Re: Hematite
Reply #2 - Feb 12th, 2024 at 4:21pm
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I want one, too! Wink
  
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Buckshot
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Re: Hematite
Reply #3 - Feb 14th, 2024 at 4:08pm
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Some Hematite from my place Treasure Valley.
  
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JoeM
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Re: Hematite
Reply #4 - Feb 14th, 2024 at 8:20pm
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Shoot, Buchshot, those are nice! I am assuming they are natural and that's the way you found them?
  
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Buckshot
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Re: Hematite
Reply #5 - Feb 14th, 2024 at 8:51pm
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It's been a while since I found them but they are natural. I may have had them made into cabachons & polished.
  
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JoeM
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Re: Hematite
Reply #6 - Feb 14th, 2024 at 10:00pm
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Okay, yeah, they do look like cabs. I was thinking they were creek tumbled. Stunners!
  
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RickB
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Re: Hematite
Reply #7 - Feb 15th, 2024 at 4:33pm
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Heck with all the name variations. Let's just call it all Moylanite  Grin
  
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Re: Hematite
Reply #8 - Feb 15th, 2024 at 8:32pm
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Yep !!  Sounds Good
  
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JoeM
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Re: Hematite
Reply #9 - Feb 15th, 2024 at 8:42pm
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HA! No, I don't think we want to go there, RickB. You can call my Chatham County Lime that if you want to. Wink

It's been interesting to me, tho, that when first starting out collecting rocks or artifacts, the most prolific and common ones are the ones you first find boring and tedious. But when you learn of all the different forms they can take all of a sudden they become the most interesting.
Like with rocks, at first I didn't think much about collecting quartz because it was everywhere and easy to find. But when you learn about the hundreds of different forms quartz, or silica, becomes, it becomes very interesting.
With artifacts it was the Guilford point. They were everywhere and actually got tired of finding them. Oh dang, another Guilford. And now, if I had to choose one point type to study, it would be the Guilford.
Crazy how we come Full Circle. Smiley
  
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