QUARTZ GEODE (COCONUT GEODE) - Chihuahua, Mexico
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('COCONUT' GEODE)
Las Choyas Geode Mine, Chihuahua, Mexico
Geodes are hollow rocks lined with crystals of various minerals and one of the world's largest and most famous deposits of geodes occurs at Las Choyas in Mexico.
The geodes were originally cavities in rhyolite volcanic lava (also called ash flow tuff) deposited during the Eocene period about 40 million years ago. The cavities were subsequently infilled with quartz by percolating groundwater which takes the form of agate and/or sparkling crystals.
The geodes are mined underground and are very attractive and highly prized. They are mostly spherical and either cracked open or cut and polished. They are often called coconut geodes due to their size and shape.
This example is a cut half with a centre lined with quartz crystals and a single crystal of calcite.
('COCONUT' GEODE)
Las Choyas Geode Mine, Chihuahua, Mexico
Geodes are hollow rocks lined with crystals of various minerals and one of the world's largest and most famous deposits of geodes occurs at Las Choyas in Mexico.
The geodes were originally cavities in rhyolite volcanic lava (also called ash flow tuff) deposited during the Eocene period about 40 million years ago. The cavities were subsequently infilled with quartz by percolating groundwater which takes the form of agate and/or sparkling crystals.
The geodes are mined underground and are very attractive and highly prized. They are mostly spherical and either cracked open or cut and polished. They are often called coconut geodes due to their size and shape.
This example is a cut half with a centre lined with quartz crystals and a single crystal of calcite.
Click on a picture for a larger image
Size: approx. 7.5 x 7.5 x 4 centimetres
Weight: 222 grams
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