ivan
starting to spend too much on rocks
Member since March 2014
Posts: 165
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Post by ivan on Aug 21, 2017 9:01:31 GMT -5
Obtained a chunk of jet (russian origin) looks promising for cabbing. Would like to know if I could get some help from the forum concerning Jet? Such as, what lubricant to use when slabbing. Mineral oil, water, soluble oil, etc. What procedure you use to bring this material up to polish. Any and all suggestions would very much be appreciated. Thank you very much for taking the time to assist this senior citizen with this matter. Ivan USAF 62-66
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Post by orrum on Aug 21, 2017 12:59:50 GMT -5
Isn't Jet a form of coal?
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Post by pauls on Aug 21, 2017 15:50:55 GMT -5
Yes its a Monkey Puzzle or Araucaria Tree thats been coalified, is that a word? Its quite easy to cut and polish but fairly soft and very messy. I would use water when sawing it, I suspect it would absorb oil. Certainly easier to dump a saw full of black water than oil. Cutting and polishing I just used the standard procedure and wheels, it takes a nice shine easily.
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ivan
starting to spend too much on rocks
Member since March 2014
Posts: 165
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Post by ivan on Aug 21, 2017 18:54:39 GMT -5
Jet is a type of lignite,[1] a precursor to coal, and is a gemstone. Jet is not a mineral, but rather a mineraloid.[2] It has an organic origin, being derived from decaying wood under extreme pressure.
The English noun "jet" derives from the French word for the same material: jaiet.[3] Jet is either black or dark brown, but may contain pyrite inclusions,[4] which are of brassy colour and metallic lustre. The adjective "jet-black", meaning as dark a black as possible, derives from this material. Also the article states a hard jet and/or soft jet??? From Wiki...
I would suspect that you are correct in that water would be the choice when sawing. So I wanted to find out what those that have worked it would suggest? Sort of a bit apprehensive in the approach without first getting some feedback. Thank you!
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Post by orrum on Aug 21, 2017 19:06:44 GMT -5
Where does it come from? Sounds interesting if it shines!
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Post by pauls on Aug 22, 2017 16:00:56 GMT -5
Try a search for "Whitby Jet" that gets you looking for the right stuff rather than flying machines. Whitby is where it comes from in England.
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ivan
starting to spend too much on rocks
Member since March 2014
Posts: 165
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Post by ivan on Aug 23, 2017 20:26:29 GMT -5
Where does it come from? Sounds interesting if it shines! Mr. pauls has posted some interesting observations. The following is a description that came directly from John Sinkankas Gem Cutting Lapidary Manual (2nd Edition). Probably just about everyone has this Book. "JET .... Jet is fairly tough and takes a fine polish, but its softness militates against its use in hard-worn items of jewelry. Like amber, it is carved with ordinary steel tools and abrasive papers and finally polished on cloth, felt, or leather, with cerium oxide, Linde A, or tin oxide. Leather buffs are preferable. In the United States jet occurs in coal seams of south-eastern Colorado and in Utah, also New Mexico. The best jet comes from Whitby, England. Hopes this helps! I've seen some from Pa and Russia. Looks promising. My main concern was in slabbing, cutting and shaping. Mr. paul suggested water. That should work for what I have in mind. Thanks for posting.
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Post by orrum on Aug 23, 2017 20:38:10 GMT -5
Thanx for the info. Sounds like it might be hard to come by though.
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Post by rockjunquie on Aug 23, 2017 21:23:52 GMT -5
A have a few small pieces sent by a friend in England who acquired it in Whitby. I shaped and polished it very easily with my Foredom. I polished with Zam and a muslin foredom wheel. It polishes very readily. It is very soft, though.
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