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Identity HelpGeologist to assess large amount of jade suspects
7th Mar 2019 17:13 UTCBruce Johnson
I am not a geologist but self-taught - spent time in rock shops, reading and purchasing samples of jades and similar minerals on Ebay to compare. But now need a professional to review what I have. As I said I will pay a commercial rate for time and expenses.
If you cannothelp can you suggestany other way to accomplish this goal?
Thanks,
Bruce Johnson
7th Mar 2019 20:14 UTCDaniel Bennett
one problem I see with what your asking is you may get 3 different geologists with 3 different answers. there are a lot of jade like rocks from California. californite, fransican chert, serpenentine just to name a few. since you have a lot that were found in river gravels you may have all of these. I urge you to embrace some tests on your own. starting with specific gravity and hardness test. you must have enjoyed finding the stuff. testing it and building confidence in your own ability is the next step. no doubt there are some highly qualified people in your area to ask for help but youll never really know with the utmost confidence unless you do the testing yourself. a few tests can go along way.
also I heard somewhere that the original meaning of the word jade is pretty green rock. the point being if you have pretty green rocks than you cant just leave them behind regardless of what they are. feel free to show pictures so we can enjoy your journey with you. -Daniel
7th Mar 2019 21:08 UTCPaul Brandes 🌟 Manager
Another thought is to post a few photos on here so we can get a look at these. It certainly won't be like actually touching the samples with our bare hands, but at least it will give us some idea of what we're dealing with. Daniel's suggestion of simple hardness and specific gravity tests will also go a long ways into determining for yourself what you have.
7th Mar 2019 22:35 UTCBruce Johnson
A second photo shows a piece around 8" tall that I rough sanded and polished
The third photo is a piece I have cut and polished
5th Nov 2019 09:08 UTCRobin White
7th Mar 2019 22:39 UTCBruce Johnson
This attachment - which I thought was in the last message shows two small suspects in situ.
8th Mar 2019 07:38 UTCIan Nicastro
8th Mar 2019 17:40 UTCBruce Johnson
Sounds like sage advice.
I do have a set of hardness picks and have used them - though some hard serpentines are harder than some softer nephrites?
I looked at specific gravity some time back but failed to find a good simple process to do it. Any suggestions?
As I said oneof my main methods - if you could call it that is to look up images on Google - incl Mindat - and Ebay and to purchase some both those that claim to be jadite or nephrite and those that claim to be related stones - Vesuvianite, serpentine, and others of similar nature. I have purchased jades of different types from different places incluing local California stuff - e.g. Jade Cove. I have talked to rock hunters and even to a few who own sme commercial jade mines - one on the Fraser River. I have purchased Canadian, Artic and Russian samples as well as Burmese and other. - So I do have a madness that is appaching a method. It is just not definitive enough.
In my own dumb way I have mentally categorized many of mine into several types but just don't know what their real names are.
8th Mar 2019 17:41 UTCBruce Johnson
8th Mar 2019 18:21 UTCBruce Johnson
The largest boulder I managed to dig out of s stream and bring back. It has been polished.
8th Mar 2019 18:49 UTCBruce Johnson
This is a large boulder found in the Far North of California but was too large to take.
10th Mar 2019 18:35 UTCDonald B Peck Expert
11th Mar 2019 04:24 UTCPaul Brandes 🌟 Manager
Pretty common in that part of the world near the Josephine Ophiolite.
11th Mar 2019 19:47 UTCDaniel Bennett
easy specific gravity test
using a digital scale weigh the rock. now put a cup of water on the scale and zero the scale. suspend the rock from a string into the cup completely submerged but not touching the cup and observe the weight. divide the two weights and that's it. the more complicated way uses an old fashioned scale that cant be zero'd. use a quartz crystal to test your results which should be 2.6. SG.
serpentine 2.4-2.6, chert 2.6, nephrite 2.9-3.1, californite 3.2-3.5. specific gravity.
the hardness of serpentine is 3-5.5. nephrite is 6-6.5. mohs.
11th Mar 2019 20:03 UTCBruce Johnson
11th Mar 2019 21:32 UTCDoug Schonewald
11th Mar 2019 21:44 UTCD Mike Reinke
13th Mar 2019 17:28 UTCBruce Johnson
Continuing my series of "suspect jade" from river gravels in N. Cal.
This one is what is referred to as a "wind slick" It is a wind-shaped stone - though found amongst gravels. It is extremely heavy and shows a dark green color in strong light.
13th Mar 2019 17:38 UTCBruce Johnson
This is a piece of stone picked up in the same N. Cal. river gravels and is what I think of as Serpentine. I have set it to show the color better.
13th Mar 2019 17:58 UTCBruce Johnson
These are slices of stone from the same locales. They have whitish rind and this dark green stone inside. One photo shows the slice poished and the other the slice with bright light shing through it.
13th Mar 2019 21:43 UTCDaniel Bennett
14th Mar 2019 15:00 UTCAndrew Espi
Andrew
14th Mar 2019 15:02 UTCAndrew Espi
14th Mar 2019 15:10 UTCAndrew Espi
14th Mar 2019 15:12 UTCDaniel Bennett
-------------------------------------------------------
> when you say "extremely heavy" i wonder exactly
> how heavy? serpentine often has a greasy feel in
> your hand.
how heavy in relation to its mass? aka specific gravity. you could go around in circles with "looks like this" or just test it and know.
14th Mar 2019 22:34 UTCBruce Johnson
I have looked at Rockhounding information and visited rock shops and purchased specimens from Ebay - so I have gained much comparative information and can sort the stuff - but am still not sure what it is. What I find and call my "suspects" are really fiver or so different types of materials - some like green jade and some that is gray/white and some like turquoise and many shades of blue and green and some nearly black.
I know Vesuvianite, Happy Camp Jade, and some of the other local look-alikes. I have looked for Jensen Blue - which is documented but exhausted, I have talked to a guy who owns a jade mine on the Fraser river - and wanted to go up there to prospect. But I am getting too old to hop around the sites like I used to.
So my interest is to figure out how to sort my collection and dispose of most of it and so some insight in needed before I do that.
14th Mar 2019 22:42 UTCBruce Johnson
Here are a few more of the type I showed earlier. They were inside a stone with a thick white rind and inside was a dark blue-green glassy material. I cut this material into some thin slices and shined very bright light through it as well as across the surface. I do not know what this stuff is but like it very much. It is all derived from the same areas where I look for jades - N Cal river gravels.
15th Mar 2019 00:49 UTCAndrew Espi
Beautiful material those close ups. I wish I was home, to take and post pictures, it will be some time. But I think we would find agreement in our collections. Whether its jadeite or nephrite whom knows, lab test. I suspect there could be jadeite jade as the other minerals/rocks would suggest it, Omphacites and other pyroxene group members. I would like to say good eyes on your end. Because I know its not easy looking at 1 million rocks. Personally I think the bulk of the jade is still buried and what we find in the river is only a fragment of what's there. 10 years, that's a long time and lots of material to play with. But hey that's how long I have been hunting big sur. Good luck sorting start with scratch test to separate jade from serpentine? use a typical steel blade though, like swiss army...as a high carbon blade can be harder than nephrite and jadeite. Not sure if you knew that already. I made the mistake of throwing rough jade back in the water...ha ha. My gut told me otherwise.
You may have, as I do, some rocks in a serpentine/jade matrix, very pretty rock. And so a scratch test wont do much there.
Good work on the research of areas. I was about to do the same getting ready for spring. Anxious to see what's out there in nor-cal. I do know the eel and Russian rivers/roads fairly well, and will be there soon.
I know those areas in Sonoma county. and do have some material from the vicinity.
Do you know if you have any Chloromelanite? found in/on Humboldt coast...a type of jadeite!
Also at one time there was a rock club up in Mendocino county...they would know some of your rocks I bet.
Andrew
15th Mar 2019 05:36 UTCBruce Johnson
Three more examples of the different types of "suspect" stones I have collected on on the N Cal river gravels. In locating areas to search I look first for Ultramafic formations and then look for accessible gravel beds in those areas. Many of these areas happen to be geologically active and sources of hydro thermal power, and are along the West coast subudction zones. In examining suspect pieces I often test them with a strong light as I have observed jade buyers and sellers to do in the jade markets in Myanmar. The edges of the jade transmits light and the ability of the light to penetrate the stone is often seen as a sign of quality.
15th Mar 2019 05:44 UTCBruce Johnson
Three more "suspects" of different types including one green and white.
20th Jul 2019 07:00 UTCJohnny Jade Bird
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: May 9, 2024 18:35:42