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Mineral and Lapidary Museum
of Henderson County, inc.

Trancas Geodes

Trancas geodes were first found in 1973 near Estacion Rancasm Aldama, Chihuahua Mexico. Mostly hollow, these geodes are largely chalcedony (non-crystalline quartz), milky and blue quartz with white and blue calcite as secondary minerals. About 30% of these have curly projections (which we call "worms") up to one-half inches in length. Most of these geodes fluoresce a very brilliant green under short wave Ultra Violet light. Blue Fluorescense is calcite.
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A Trancas Geode under normal lighting.

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The same geode under short wave Ultra Violet lighting.

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A "wormy" Trancas Geode under normal lighting.

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The same geode under short wave Ultra Violet lighting.

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© 2006 Mineral Museum of Henderson County, Inc.