Pictured above is an historic specimen displaying numerous microscopic chabazite and heulandite crystals at a contact point on a slab of Bal...
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November 25, 2014
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"Baltimore County" heulandite chabazite,
"NCR Trail" "Torrey C. Brown Trail" zeolites "Little Falls" "Jones Falls" "Baltimore gneiss" "John Betts" "Jeff Weissman"