Please Help rock ID
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  1. #1
    us
    Mar 2011
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    145 times

    Please Help rock ID

    Found this 48 pound stone gold prospecting in a bedrock creek 70 miles north west of St.Louis Missouri. It is roughly 12 x 7 . Weighs 48 pounds. Highly magnetic. Has a 1/4 outer crust.
    Here are hopefully good pictures of the stone. One piece has been cut off.
    thank you
    CatfishName:  A540961E-E061-4A3F-99A2-5D78D1E74AA0.jpeg
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    A2coins and T.C. like this.

  2. #2
    us
    May 2014
    AZ
    Beach High Banker, Sweep Jig, Whippet Dry Washer, Lobo ST, 1/2 width 2 tray Gold Cube, numerous pans, rocker box, and home made fluid bed and stream sluices.
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    Quote Originally Posted by catfishjim90 View Post
    Found this 48 pound stone gold prospecting in a bedrock creek 70 miles north west of St.Louis Missouri. It is roughly 12“ x 7“ . Weighs 48 pounds. Highly magnetic. Has a 1/4” outer crust.
    Here are hopefully good pictures of the stone. One piece has been cut off.
    thank you
    CatfishName:  A540961E-E061-4A3F-99A2-5D78D1E74AA0.jpeg
Views: 228
Size:  31.0 KBClick image for larger version. 

Name:	B90B3053-8FB4-4079-9422-4BA87583D7B6.jpeg 
Views:	52 
Size:	2.69 MB 
ID:	1798870Click image for larger version. 

Name:	9F53E9F2-3B7E-4996-B791-676AE07C8F05.jpeg 
Views:	51 
Size:	3.94 MB 
ID:	1798871Click image for larger version. 

Name:	F4158CD4-68C8-4FF9-8D31-7A4C99ED50AE.jpeg 
Views:	51 
Size:	2.18 MB 
ID:	1798872Click image for larger version. 

Name:	30E9A221-A218-4FC9-9274-6B4CC2FD9A7E.jpeg 
Views:	49 
Size:	3.31 MB 
ID:	1798873
    Is that thing really blue inside? I am color blind but that is the color I see.
    A2coins likes this.
    If it can't be grown, it must be mined!

  3. #3
    us
    May 2009
    Sailor Flat, Ca.
    SDC2300, Gold Bug 2 Burlap, fish oil, ACME handbook for TRUE prospectors (unread)
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    highly magnetic. means iron will stick to it. if it is attracted to a magnet it could be ferromagnetic. Some sort of mineral with a lot of iron.

    Magnets will attract to certain minerals that aren't technically magnetic.

    A minerals magnetic property is based on how it's magnetic field affects certain objects that would react to its type of magnetism.
    A2coins likes this.

  4. #4
    Charter Member
    us
    I can dig it! "WP"

    Mar 2007
    Arizona
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    Sedimentary. Your sample appears to be illuminated with UV to me. My guess is calcium carbonate precipitated into mudrock or formed as a concretion, either way it would be attracted to a magnet as calcium carbonate (calcite) is diamagnetic in nature.

    Also the fine crystalization is consistant with calcium carbonate concretion.
    Plus the blue/purple color shown above under UV is consistant with that displayed by certain examples of calcium carbonate under UV.

    Tough to make a definitive ID without a hands on inspection. Educated guess only.

    Hope this helps,
    GG~
    Last edited by Goodyguy; Feb 07, 2020 at 12:48 PM.
    tamrock likes this.

  5. #5
    us
    Mar 2011
    101
    145 times
    Thanks Goodyguy. For the info.
    this is such a weird rock. It is strongly attracted to a magnet.
    and very heavy for its size 48 pounds . I illuminated the picture with a regular flashlight no UV.
    Where could I take it To get a definite ID. I would even pay. Thanks again Catfishjim
    Goodyguy likes this.

  6. #6
    us
    May 2014
    AZ
    Beach High Banker, Sweep Jig, Whippet Dry Washer, Lobo ST, 1/2 width 2 tray Gold Cube, numerous pans, rocker box, and home made fluid bed and stream sluices.
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    3251 times
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    Quote Originally Posted by catfishjim90 View Post
    Thanks Goodyguy. For the info.
    this is such a weird rock. It is strongly attracted to a magnet.
    and very heavy for its size 48 pounds . I illuminated the picture with a regular flashlight no UV.
    Where could I take it To get a definite ID. I would even pay. Thanks again Catfishjim
    You say it is strongly attracted to a magnet. Do you mean as strongly as a magnet attaches itself to steel?

    Look up nickel minerals or ores and see if any of those descriptions match what you have. Nickel itself is magnetic and heavy so it makes sense to me that the minerals would be too to some extent. You may live near a university that has a geology department with someone who would be willing to look at what you have or just the smaller hunk you sawed out and ID it for you.

    I bet that slabs or cabochons of the rock would polish up nice. Retirement centers often have lapidary groups that may be willing to do some of the work including setting them in jewelry pieces.

    Good luck.
    Last edited by arizau; Feb 07, 2020 at 03:50 PM.
    Goodyguy likes this.
    If it can't be grown, it must be mined!

  7. #7
    us
    Mar 2011
    101
    145 times
    Thank you arizau.
    I will check out your info.

  8. #8
    Charter Member
    us
    I can dig it! "WP"

    Mar 2007
    Arizona
    Whites TM 808, Whites GMT, Tesoro Lobo Super Traq, Suction Dredges, Trommels, Gold Vacs, High Bankers, Fluid bed Gold Traps, Rock Crushers, Sluices, Dry Washers, Miller Tables, Rp4 Shaker table, etc.
    6,089
    5651 times
    All Types Of Treasure Hunting
    Quote Originally Posted by catfishjim90 View Post
    Thanks Goodyguy. For the info.
    this is such a weird rock. It is strongly attracted to a magnet.
    and very heavy for its size 48 pounds . I illuminated the picture with a regular flashlight no UV.
    Where could I take it To get a definite ID. I would even pay. Thanks again Catfishjim
    I'm stumped, the color and the magnetic properties dont seem to go together.
    Arizau gave you great advice, If it were mine I would be taking it to a university for positive ID.

    I have never seen anything like it.
    Please let us know what you find out. Very interesting specimen.

    GG~
    Last edited by Goodyguy; Feb 07, 2020 at 07:42 PM.

  9. #9
    Charter Member
    us
    Nov 2012
    Maryland
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    Could be an iron precipitate like hematite rounded into that form. The UV light is reflecting off of it, giving it a bluish tint.

  10. #10
    Charter Member
    us
    I can dig it! "WP"

    Mar 2007
    Arizona
    Whites TM 808, Whites GMT, Tesoro Lobo Super Traq, Suction Dredges, Trommels, Gold Vacs, High Bankers, Fluid bed Gold Traps, Rock Crushers, Sluices, Dry Washers, Miller Tables, Rp4 Shaker table, etc.
    6,089
    5651 times
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    Quote Originally Posted by smokeythecat View Post
    Could be an iron precipitate like hematite rounded into that form. The UV light is reflecting off of it, giving it a bluish tint.

    The OP said NO UV light. Regular flashlight only!

    That's what stumped me. I assumed it was under a UV light .
    Last edited by Goodyguy; Feb 07, 2020 at 08:21 PM.

  11. #11
    us
    Mar 2011
    101
    145 times
    Thanks guys for the info. I will try to take some more pictures and post them

  12. #12
    us
    May 2014
    AZ
    Beach High Banker, Sweep Jig, Whippet Dry Washer, Lobo ST, 1/2 width 2 tray Gold Cube, numerous pans, rocker box, and home made fluid bed and stream sluices.
    2,199
    3251 times
    Prospecting
    Quote Originally Posted by catfishjim90 View Post
    Thanks guys for the info. I will try to take some more pictures and post them
    Outside in natural light would be good.
    Goodyguy likes this.
    If it can't be grown, it must be mined!

  13. #13
    us
    May 2009
    Sailor Flat, Ca.
    SDC2300, Gold Bug 2 Burlap, fish oil, ACME handbook for TRUE prospectors (unread)
    5,888
    12807 times
    All Types Of Treasure Hunting
    Banner Finds (1)
    looks more like an intrusive rock than sedimentry
    Goodyguy likes this.

  14. #14
    Charter Member
    us
    I can dig it! "WP"

    Mar 2007
    Arizona
    Whites TM 808, Whites GMT, Tesoro Lobo Super Traq, Suction Dredges, Trommels, Gold Vacs, High Bankers, Fluid bed Gold Traps, Rock Crushers, Sluices, Dry Washers, Miller Tables, Rp4 Shaker table, etc.
    6,089
    5651 times
    All Types Of Treasure Hunting
    Quote Originally Posted by Goldwasher View Post
    looks more like an intrusive rock than sedimentry
    The overall shape combined with a crystaline interior and a outer shell with voids between it and the inner mineral still has me leaning toward sedimentary, like a geode. Although intrusive is a viable possibility.

    GG~
    Last edited by Goodyguy; Feb 08, 2020 at 11:26 PM.

  15. #15
    us
    Mar 2011
    101
    145 times
    I think I just found out what it is.
    Basalt rock ingenious intrusive?
    Goldwasher likes this.

 

 
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