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Thread: What kind of crystal is this?

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  1. #1
    us
    Mar 2011
    70
    91 times

    What kind of crystal is this?

    Got this at a flee market, waighs about 15 pounds. Thanks for any info. Here is on other pic of the crystal Attachment 1522112Click image for larger version. 

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    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by catfishjim90; Dec 02, 2017 at 07:10 AM. Reason: New pictures
    3cylbill and loco oro like this.

  2. #2
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White's GMT, DFX, Coinmaster, TDI-SL, old Garrett Masterhunter BFO 'Way Too Cool' dual 18 Watt UV light
    2,065
    2009 times
    Prospecting
    Looks like glass.
    Jim

  3. #3
    us
    Mar 2014
    Traveling US to work
    Current Whites DFX Past Garret GTI 2500 and others Prospecting Minelab GPZ 7000 Past SD 2100 GP 3000 (retired)
    1,738
    1196 times
    Metal Detecting
    Thanks for adding the second picture. Not sure but it looks like florite however I've not seen inclusions, the white crystaline spots, in florite like that. About how hard is the crystal, test it in an inconspicuous spot as it is a good looking cluster.
    loco oro likes this.
    Everyone Believes they have gold buried in the back yard... small wonder so few ever look for it.

  4. #4
    us
    Aug 2013
    582
    349 times
    All Types Of Treasure Hunting
    I agree with ddancer, looks like fluorite, cubic habit, hit it with a UV light, should fluorece if so, nice big cabinet piece, I like it

  5. #5
    Charter Member
    us
    Nov 2010
    The Great Southwest
    2,680
    7487 times
    Prospecting
    It's not Fluorite with that cleavage. Flourite has perfect cleavage and a splintery sub-conchoidal fracture.

    I'm with Jim. I'd guess glass from the pictures. Possibly from a building fire.

  6. #6
    se
    Sep 2006
    Sweden
    White's V3, Minelab Explorer II & XP Deus.
    5,846
    1533 times
    Prospecting
    I'm also inclined to think glass.
    Geologists are gneiss, tuff, and a little wacke.

  7. #7
    us
    May 2015
    West Lower Peninsula, MI
    156
    95 times
    Prospecting
    I'd use a cheap iron nail to do a scratch test - you don't want to use a good one that is hardened steel...if it scratches the green, it could be flurite (COULD) - if it doesn't scratch it then use a "good" nail. Either way it's probably glass.

  8. #8
    us
    Jason

    Apr 2011
    Butte City, Montana
    ace 250/garret pinpointer, garret AT Gold
    1,125
    1312 times
    All Types Of Treasure Hunting
    I agree with Clay diggings, all the fluorite I have cleaves into octohedrons (spelling sucks sorry). The concoidal fracturing looks an awful lot like glass to me.

  9. #9
    us
    Mar 2014
    Traveling US to work
    Current Whites DFX Past Garret GTI 2500 and others Prospecting Minelab GPZ 7000 Past SD 2100 GP 3000 (retired)
    1,738
    1196 times
    Metal Detecting
    I agree thats what the fracture patten suggests, glass, however I tossed fluorite out due to what appears to be structured crystal along those lines. Sometimes nature gets weird with things and those, I'll call them snow flakes, inclusions as well as what appears to be a base rock give me pause. It is possible it is melt glass that may have some how been formed by debris in a fire but its just weird to me.
    TheOculus likes this.
    Everyone Believes they have gold buried in the back yard... small wonder so few ever look for it.

  10. #10
    se
    Sep 2006
    Sweden
    White's V3, Minelab Explorer II & XP Deus.
    5,846
    1533 times
    Prospecting
    Quote Originally Posted by DDancer View Post
    I agree thats what the fracture patten suggests, glass, however I tossed fluorite out due to what appears to be structured crystal along those lines. Sometimes nature gets weird with things and those, I'll call them snow flakes, inclusions as well as what appears to be a base rock give me pause. It is possible it is melt glass that may have some how been formed by debris in a fire but its just weird to me.
    Probably the inner most (brick) portion of a glassmelting oven.
    I've tore a few of those down, the inner-most bricks can begin to turn to glass from the heat, giving a crystalline-like appearance.
    DDancer and TheOculus like this.
    Geologists are gneiss, tuff, and a little wacke.

 

 

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