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M0017 - Apophyllite, Stilbite on Chalcedony from India

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Apophyllite and Stilbite on Chalcedony
 from
Aurangabad, India

M0017 - Apophyllite, Stilbite on Chalcedony from India

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The basalt trap rocks (lava flows) of Central to Northern India are world famous for the spetacular minerals found in what were trapped gas bubbles and lava tubes in the basalt. One of the most famous of these was the fabulous 'Jewel Tunnel", a railroad tunnel dug through the basalt by the British in the late 1800's. Today the basalt is quarried for road fill much as the limestone is mined here in the midwest. Occasionally these operations in India break into areas of trapped gas bubbles filled with beautiful mineral specimens. This has been the source of these fine minerals for decades. We have similar deposits here in the Unitaed States in the Columbia River basalts of Washington. However, the trapped bubbles were much smaller and the crystals are generally less than 10% of the size of their Indian counterparts. This specimen is an opening lined with white Chalcedony (a cryptocrystalline variety of Quartz) with creamy orange Stilbite and transparent Apophyllite. The specimen measures 7 X 10.5 inches and is 4 inches deep.