No announcement yet.


  • Filter
  • Time
  • Show
Clear All
new posts

  • Chalcedony

    Nuther One was a hoot today.
    He was rattling off as many lithics as he could. For a kid finishing Kindergarten, I was more than impressed!
    He was probably close to the neighborhood of twenty!

    To the point, he is curious about Chalcedony.

    1. Can anyone share info on this desirable, translucent lithic?

    2. Are any in this pic Chalcedony?

    Thank you!
    Attached Files
    northwestern Pennsylvania

  • #2
    Click image for larger version

Name:	185C8D40-E314-4FFE-BA5A-D05DB389016F.jpeg
Views:	199
Size:	70.5 KB
ID:	559560 I’m a total rookie when it comes to lithics.. if this piece is translucent, when held to light... maybe a possibility?
    .. good one nuther one!~...👍
    Southeastern Minnesota’s driftless area


    • #3
      Thanks Up North!
      All 5 are extremely translucent.
      northwestern Pennsylvania


      • #4
        Chalcedony has a waxy feel and comes in a lot of colors .


        • #5
          Maybe he’ll be a geologist..


          • #6
            I am so tired of looking up lithic’s and trying to learn these . Thank goodness I mostly have coattail plain Chert , quartzite's. Rarely Jasper .

            I appreciate it when one of you lithic experts puts it in writing .


            • #7
              I'm no geologist - and a simple wiki search would be a more reliable - but my understanding is chalcedony is a metamorphic rock with a micro/cryptocrystalline structure. Agate and jaspers are both chalcedony with one being clear and the other opaque. Something like that anyway. Lovely stuff.

              Agate and jasper.

              Click image for larger version

Name:	20190327_150708.jpg
Views:	137
Size:	81.4 KB
ID:	560300

              Click image for larger version

Name:	20190428_123214.jpg
Views:	129
Size:	74.8 KB
ID:	560301


              • #8
                Chalcedony, agate, flint, carnelian, jasper chert, chrysoprase, onyx, Petrified wood .... ALL are microcrystalline/cryptocrystaline quartz as opposed to macrocrystalline quartz like citrine, amethyst, and rose/smoky quartz. I think for example though that in microcrystalline quartz varieties there are more "impurities" which produce variations. Click image for larger version

Name:	Weedon.jpg
Views:	123
Size:	13.0 KB
ID:	560492
                Professor Shellman
                Tampa Bay


                • Cecilia
                  Cecilia commented
                  Editing a comment

              • #9
                Very nice Tom . Great addition


                • #10
                  Flint, It great that your son has such a keen interest in points and lithics. It looks to me like your whole perimeter of points could be calchedony.
                  Click image for larger version

Name:	Calchedony.jpg
Views:	117
Size:	77.3 KB
ID:	560724
                  (My only calchedony point, brown tint due to table top & wishing for a better camera)
                  Click image for larger version

Name:	18CH91.2.002D.jpg
Views:	126
Size:	34.1 KB
ID:	560725
                  (Anne Arundel Co. )
                  Click image for larger version

Name:	MicroCH91.2.002D.jpg
Views:	126
Size:	96.7 KB
ID:	560726
                  (Microscope shot of above)
                  A lot of the whitish calchedony that I see down here has "oil spots" running through it. I use the term "oil spots" because some look like a liquid string of dots, they are probably some mafic inclusions.

                  There is also another type called WAC, or Weather Amber Calchedony that was favored by the Paleoindians. It looks its been peeled from geodes to me, I think it occurs in PA too.

                  WAC Virginia

                  Coastal Plain of Maryland


                  • Tam
                    Tam commented
                    Editing a comment
                    I actually bought a microscope for this . Do you just transfer the pics with your computer . That’s what I did . Very high resolution . Looks like the Hubble telescope .

                • #11
                  You know I did contact the Company in Japan that came up with emojis .
                  I need an emoji with the hand going over the head !
                  Like out of my league! But I am learning


                  • Cecilia
                    Cecilia commented
                    Editing a comment
                    You mean like 🙋🏻‍♀️? These my personal favorites:🤦🏻‍♀️🤷🏻‍♀️🙆🏻‍♀️….lol!

                • #12
                  Yes mam . Who doesn’t need the hand over the head .
                  I can name as me a few on here tgat fong .
                  but I do !