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Post by fredda on Mar 31, 2008 16:31:31 GMT -5
 This and other rocks are being used for beach erosion around the bridge onto the island where I live. This piece is greener that it shows here. Thanks, fredda |
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Post by jwnagy on Mar 31, 2008 16:42:46 GMT -5
Fredda
It looks like it could be serpentinite, probably from Rockville Quarry in Montgomery County. It may even be trap rock from one of the Norrhern Virginia quarries.
Jeff
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Post by fredda on Mar 31, 2008 17:02:06 GMT -5
Thanks, jeff. What is trap rock?
fredda
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Post by pegmatite on Mar 31, 2008 18:47:26 GMT -5
Trap rock is another name used for basalt. It is commonly used for rip rap and channel linings.
Steve
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Post by jwnagy on Mar 31, 2008 22:28:48 GMT -5
Steve, you beat me to it!  Fredda, The lighter colored material is probably calcite, or it could even be very light colored prehinite if its from the N. Va. location. The railroad I work for uses alot of the NVa material, and some serpentinite for rail-yard ballast and other railbed related building projects. Jeff |
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Post by fredda on Apr 1, 2008 14:33:37 GMT -5
Thanks to both of ya. fredda  |
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Post by DigDug on Apr 10, 2008 12:10:44 GMT -5
That is also leaverite....lol but a nice specimen
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