Brian
fully equipped rock polisher
Member since July 2020
Posts: 1,512
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Post by Brian on Jan 26, 2021 13:35:54 GMT -5
Wow! That looks like it was worth the drive! Did you find anything else or was that the showstopper?
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Post by jasoninsd on Jan 26, 2021 15:49:37 GMT -5
What a beautiful treasure - and it definitely looks like it would have made the trip worth it (morale-wise if not financially  )!!!  There have been a couple times when I've found a Fairburn and just knew that was going to be the highlight of the day...of course always hoping for something else or something better...but I have a tendency to look at everything afterwards with a "that-doesn't-compare-so-I'm-not-picking-it-up" demeanor! LOL |
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Post by jasoninsd on Jan 26, 2021 19:39:13 GMT -5
Thanks jasoninsd . At this point I compare what I’m looking at to all of my finds, not just the ones from that same day. This keeps my place from looking like I built on a gravel bar! There's numerous "gravel pits" around the area that I've gained access to hound. It's more dug up river rock than it is gravel, so it's always worth a look...but with everything I bring home, my neighbors are soon going to think I'm going for a "gravel pit motif"! LOL |
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Sabre52
Cave Dweller 
Me and my gal, Rosie
Member since August 2005
Posts: 20,494
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Post by Sabre52 on Jan 29, 2021 10:28:16 GMT -5
Wow, nice hunk of jade. Is that Washington state material? Has the look of some I've seen from Chromoflec Mine in the Darrington region....Mel
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Post by greig on Jan 29, 2021 11:13:08 GMT -5
I have never looked for jade, but know of a few places in northern BC where it is supposed to be. I intend to give it a go if/when I drive out there. No point finding big rocks like that when I fly. When you are looking in a river, does it shine better when wet?
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Post by Pat on Jan 29, 2021 13:56:22 GMT -5
Looks related to some serpentine.
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gemfeller
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Member since June 2011
Posts: 4,060 
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Post by gemfeller on Jan 29, 2021 14:56:45 GMT -5
I have never looked for jade, but know of a few places in northern BC where it is supposed to be. I intend to give it a go if/when I drive out there. No point finding big rocks like that when I fly. When you are looking in a river, does it shine better when wet? The colors come out better when the rocks are wet, but the greens are rarely more noticeable than any other green rock in the river. Looking in an area where it’s known to be found is a good start, if you make it out there find a rockshop or collector that can show you some river worn finds that haven’t been polished or oiled yet. One tip I got about finding jade in a river or stream is that it tends to be warmer by feel than surrounding rocks. I don't know whether this is true or not but maybe you veteran jade-finders can tell me. Lovely find, @jadedvison! |
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Post by Pat on Jan 29, 2021 16:47:06 GMT -5
gemfeller. I’ve heard that jade is cooler. Don’t know if location (water) makes a difference. Interesting subject.
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gemfeller
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Member since June 2011
Posts: 4,060
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Post by gemfeller on Jan 29, 2021 16:48:37 GMT -5
gemfeller. I’ve heard that jade is cooler. Don’t know if location (water) makes a difference. Interesting subject. It's time for an experiment! |
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Post by stephan on Jan 30, 2021 1:42:25 GMT -5
Looks related to some serpentine. They are most definitely related. Both are formed when basalt and marine deposits (usually radiolarian sludge) are subducted. Whether it turns into serpentine or jade depends on how deeply the mixture was subducted. I forget the exact depths — I’ll have to look it up later, but I seem to remember something like 1-3 miles deep yields serpentine, 4-6 miles yields nephrite and 7-10 miles yields jadeite. gemfeller cooler than other rocks is what I’ve heard, but this is for dry stones in a cool place. Probably not diagnostic for anything found in a cold river, or in the hot sun. For stones in the wild, hardness differentiates from serpentine, luster differentiates from green chert or jasper. Sometimes. Other times it needs a test for SG (not usually done in the field). |
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Brian
fully equipped rock polisher
Member since July 2020
Posts: 1,512
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Post by Brian on Jan 30, 2021 8:43:32 GMT -5
Looks related to some serpentine. They are most definitely related. Both are formed when basalt and marine deposits (usually radiolarian sludge) are subducted. Whether it turns into serpentine or jade depends on how deeply the mixture was subducted. I forget the exact depths — I’ll have to look it up later, but I seem to remember something like 1-3 miles deep yields serpentine, 4-6 miles yields nephrite and 7-10 miles yields jadeite. gemfeller cooler than other rocks is what I’ve heard, but this is for dry stones in a cool place. Probably not diagnostic for anything found in a cold river, or in the hot sun. For stones in the wild, hardness differentiates from serpentine, luster differentiates from green chert or jasper. Sometimes. Other times it needs a test for SG (not usually done in the field). You could all be right about the “feel” of a material such as jade. It may be that it simply conducts heat very slow, so a rock that has already absorbed heat may be slower to lose it and feel warmer than the surrounding rocks. Likewise, if it has already transferred much of its heat (it is already cold) then it will take longer to absorb the heat from its surroundings and feel cooler than the other rocks. The important thing to remember may be that the temperature of the rock simply fees a bit different than surrounding rocks, signaling that it has a low heat transfer coefficient. |
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,494
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Post by Sabre52 on Jan 30, 2021 9:37:00 GMT -5
Since jade is usually associated with serpentine, it's easy to tell jade from serpentine. Serpentine scratches with a common nail while jade does not and if tapped with your rock hammer, jade rings or tinks and serpentine thunks or thuds. Way we hunted jade at Tulare, CA was to tap boulders and lenses and listen for the ring. Jade nodules in situ often have a red or white rind too....Mel
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Post by stephan on Jan 30, 2021 16:21:47 GMT -5
A scratch test on jade isn’t always accurate, the outer weathered surfaces can sometimes scratch which can be misleading. There’s probably some variation in hardness between different types of stainless steel also. I’ve always described the sound when tapped with a hammer as a sharp crack versus a dull thud. My gem serpentine finds sing like glass when tapped more than any of my jade finds. Specific gravity test is really the way to go, but you can still find actinolite, tremolite, and nephrite with the right specific gravity that are pretty hard, but undercut and don’t take a polish. #Truth! |
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,494
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Post by Sabre52 on Jan 30, 2021 17:29:04 GMT -5
Yeah, all my jade hunting experience was primarily on the Porterville region of Tulare county and we did not encounter gem serpentine at those locations, nor were there actinolite and tremolite. We just had the regular old Sierra foothill sepentine and soapstone. Nail and tink worked swell there.
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rockstock
spending too much on rocks
Member since April 2019
Posts: 472
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Post by rockstock on Jan 30, 2021 17:33:48 GMT -5
Pretty cool!
I love the green rocks and tend to see a bunch. Would you know if Michigan has any jade, jadeite, nephrite or serpentine and any newbie tips on how to have a clue what all the green is?
I think I have random green jasper and different hues of Epidote but not quite sure what else or if those are the general categories, or green granite/gniess type things. Thanks
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,494
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Post by Sabre52 on Jan 30, 2021 19:02:36 GMT -5
Rockstock: I checked John Sinkankas' book ans closest jade to you would be Wisconsin, no gem serpentine, jade etc in Michigan.
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rockstock
spending too much on rocks
Member since April 2019
Posts: 472
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Post by rockstock on Jan 30, 2021 21:19:34 GMT -5
Rockstock: I checked John Sinkankas' book ans closest jade to you would be Wisconsin, no gem serpentine, jade etc in Michigan. Thank you I'll just keep plucking the ones that stand out to me for whatever reason and worry less about any potential green misunderstanding, the jade nephrite thing sounds a tad confusing. |
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quartzilla
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Post by quartzilla on Jan 31, 2021 9:51:26 GMT -5
Yeah, all my jade hunting experience was primarily on the Porterville region of Tulare county and we did not encounter gem serpentine at those locations, nor were there actinolite and tremolite. We just had the regular old Sierra foothill sepentine and soapstone. Nail and tink worked swell there. Sabre52 did you ever look for chrysoprase in the Porterville area or were those deposits inaccessible/exhausted by then? . I am sorta fascinated with the variety and quality of material that is found in that area. I’ve only been to Porterville once briefly and it was not a collecting trip. |
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NRG
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Member since February 2018
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Post by NRG on Feb 5, 2021 12:53:25 GMT -5
gemfeller. I’ve heard that jade is cooler. Don’t know if location (water) makes a difference. Interesting subject. It's time for an experiment! I think both yall are right. Jade conducts heat and has a high thermal mass. So, in the hot sun, jade feels hot. In cold weather it feels colder. |
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Post by jasoninsd on Feb 5, 2021 20:57:27 GMT -5
Holey Shamoley those are gorgeous! I like the different hues in these...breathtaking! |
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