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Description |
A large specimen hosting dozens of sharp Chabazite crystals showing a golden, iridescent, almost metallic luster. Although small, to about 2mm, the crystals really stand out dramatically because of their sharp geometry and riveting color - more so in person. The earliest reference I found to this quarry was Maryland Geologic Survey, Vol. VIII (1898). This matrix shows the layered gneiss on the backside with the layer of zeolite deposition on top, and so the full environment of the pocket is here. The Heulandite is present as almost acicular, odd-looking black sprays laying horizontally on the matrix, much of which is coated with a thin layer of Siderite or possibly Calcite atop. Ex Philadelphia Academy of Natural Science. |
