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Post by Redrummd on Mar 18, 2010 10:34:12 GMT -5
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Post by hydrogeologist on Mar 18, 2010 18:51:55 GMT -5
Just curious as a Marylander--are you sure it's agate and not Williamsite (gem serpentine)? As a cutter I'm sure you felt the hardness of the material, but I've seen some extremely nice gem serpentine with dissipated chromite in it that looked a LOT like that material.
Lawrence
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Post by Redrummd on Mar 18, 2010 20:14:16 GMT -5
It is definitely agate....
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Post by 4cornersrocks on Mar 23, 2010 22:21:28 GMT -5
Yeah the gemmy stuff looks like chrome diopside or more likely dioptase. Could be some odd form of chrysoprase but who knows...
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Post by Dicky the Rockhunter on Mar 24, 2010 6:19:14 GMT -5
somehow I thought that cromium dioptase was blue.  Dicky |
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Post by Dicky the Rockhunter on Mar 24, 2010 10:52:37 GMT -5
my bad ! I guess that my head was confused by the 18 inches of snow from last night.   Chromian enstatite, a chrome-rich variety of enstatite (MgSiO2), has a hardness of 5.5 to 6 and specific gravity of 3.1 to 3.3, and occurs as orthorhombic crystals with similar emerald-green color as chromian diopside. Both chrome diopside and enstatite have well-developed cleavage and parting, which unfortunately limits the size of facetable material. Enstatite produces crystals with square cross-sections when viewed down the c-axis of the crystal and diopside will have a similar cross-section with one pair of crystal surfaces that are inclined to the all other crystal faces. Faceted |
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Post by di66er on Mar 25, 2010 10:05:35 GMT -5
Wow that is some nice looking rock, great knife and photos thanks for showing us.
Dicky maybe do like the bears and hibernate a while hehehe
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Post by Dicky the Rockhunter on Mar 25, 2010 17:13:18 GMT -5
 the temp has gone up to 58 and most snow is now gone , but more snow on sat . Glad it is spring and our rains are now snow till about end April. However not waisting time --- see post re diamonds in Va. Dicky
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Post by romare on Mar 25, 2010 23:08:57 GMT -5
Whatever the constituency, that is some flat gorgeous material. I believe I really, really need a fixed blade with that on it.
Mark
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Post by crystalchemy on Mar 15, 2011 5:03:01 GMT -5
doesn't look like any agate I've seen, seems to be a sedimentary jasper with iron and nickel or chrome. any idea where its from? reminds me of China
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the temp has gone up to 58 and most snow is now gone , but more snow on sat . Glad it is spring and our rains are now snow till about end April. However not waisting time --- see post re diamonds in Va.