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Post by Bob on Sept 23, 2020 23:30:42 GMT -5
Some done last year. Tough material to get past imperfections. Can take 3-6 months.
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Post by Toad on Sept 24, 2020 4:13:30 GMT -5
I've had some for years that I have never gotten around to. I hope my turns out as well as yours did.
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lordsorril
freely admits to licking rocks
Member since April 2020
Posts: 873
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Post by lordsorril on Sept 24, 2020 6:27:16 GMT -5
Neat! Very clean, and a great polish. Looks very different from the carnelian I get from Mozambique.
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,711
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Post by Fossilman on Sept 24, 2020 9:34:54 GMT -5
BINGO! Those are great!
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Post by Bob on Sept 24, 2020 9:37:01 GMT -5
I remember getting it from 3 different places, eBay, KN, and ? Some was lighter, some darker and more desirable to me. But OMG is this chalcedony tough. In this process of researching this material, and what it is, I learned it is rather common in OR and easy to find on surface in many places there after forest fires. If banded, it can be called carnelian agate. I have only two pieces like that.
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Post by TheRock on Sept 30, 2020 9:03:52 GMT -5
You hit that one out of the park! The shine is fine.
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Post by Bob on Oct 7, 2020 10:27:57 GMT -5
Okay, here is my first attempt at posting what I believe is the correct classification of a material I'm posting about.
Type: Quartz, a mineral. Subtype: chalcedony Subtype: fibrous Subtype: non-banded Subtype: color orange, red, or amber = Carnelian, a named variety of Quartz. Common in several countries, including the USA in NJ and OR.
Since we typically subdivide Quartz down to chalcedony as a group, when I'm educating others about it I like to say that orange, red, or amber chalcedony is usually called Carnelian. Mohs 6.5-7.0.
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Post by stephan on Oct 7, 2020 22:37:41 GMT -5
Carnelian... carnelian agate... and just to make it more fun, the yellowish or brownish variety of carnelian can be further sub-typed into sard. And if the sard is banded with white bands, it is sardonyx. 🤯
In any case, nice shine.
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lparsons
Cave Dweller
Member since April 2020
Posts: 276
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Post by lparsons on Oct 7, 2020 22:43:55 GMT -5
What a beautiful batch!
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Post by Bob on Oct 8, 2020 11:37:53 GMT -5
As to sard and sardonyx, those words are especially used in varying ways. After much searching about them, I concluded (rightly or wrongly) as best I could that:
Sard = merely a convenient name for brown chalcedony. Sardonyx = a form of onyx that is unique in that its bands include red bands.
I have in my classification studies found unique descriptive names for forms of chalcedony that are blue, brown, green, orange/red/amber, purple, and white. I'm going to look in my pile of polished chalcedony and see if I have any yellow. Of course, from light yellow to dark brown one might be able to say that it's all various shades of brown.
This has caused me to realize that like the word quartz has two meanings, so does chalcedony.
#1. The huge subdivision of the mineral Quartz that is micro-crystalline and crypto-crystalline (though is usually contains some Moganite).
Then we divide chalcedony in to granular (which leads to cherts and jaspers) vs fibrous. Then we divide fibrous into banded (which leads to agates and onyx) and non-banded.
#2. The many varieties of the mineral Quartz remaining after carving off macrocrystalline, granular, and banded which includes Binghamite, Fire "agate", chrysoprase, moss "agate", carnelian, chuckwalla springs "agate" and many others, and so a very limited subset of #1.
Chalcedony was a word I had never heard in my life until I started trying to learn from mineralogy after becoming a tumbler.
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