Coney Grade Site, Santa Monica Mts., Ventura Co., California

10.3 x 7.1 x 4.1 cm

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The dark colored basalt of this specimen is filled with small vesicles filled with white Mordenite. There is a large area on one surface covered with Mordenite composed of tangled and matted fibrous crystals. There is also present an unidentified black material. From a very obscure location. The specimen is in good condition with no appreciable damage.