popeyecollector Posted September 14, 2015 Report Share Posted September 14, 2015 So much space is given to machine made marble names - why not look to hand made stone agates for a breath of fresh air? Definition -- Chalcedony a hard stone deposit, usually formed into a football size solid nodule or hollow geode by a long process of water evaporation and a layered deposition of dissolved mineral impurities. Common types are agate, carnelian (aka cornelian), moss agate and onyx Onward --In my view agates that found their way into kids marble bags or game boards were never larger than 3/4. (Cant grip with index finger for shooting!) Some vintage eye candy faceted agates greater than 1.5 exist but most are contemporary. All German agate marbles were facetted and probably more for eye appeal - dyed with sugar, sulfuric acid, arsenic along with other nasty chemicals - then often exposed to UV light to produced intense bands of black, yellow, blue, white and a rare green. When geode - nodule supplies ran out in Germany - eastern Brazil had plenty of exactly the same agate geode - nodules! -- (thanks to Continental Drift) -- Beware of marbles made of lapis lazuli, tigers eye, moss agate, lace agate, bloodstone or any other exotic mineral, they were probably purchased at a gem and mineral show and slipped into the secondary market or at least not made for a marble bag. Spoiler Alert! Some years back -there were skillful grinders taking orders to custom apply facets or ground pontils! Some of the mineral information was taken from Wikipedia. Thats my story and Im sticking to it! Big Indian Link to comment Share on other sites More sharing options...
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