File:Lithia pegmatite with rubellite tourmaline in lepidolite mica matrix, Pala CA.jpg

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Lithia pegmatite with radiating clusters of dark pinkish rubellite tourmaline in lepidolite mica matrix. (Colorado School of Mines Geology Museum, Golden, Colorado, USA)

The Pala Pegmatite of southern California is unusual for having pockets of lithium-rich minerals. The samples shown here are lithia pegmatites consisting of grayish-purple lepidolite mica (KLi2Al(Al,Si)3O10(F,OH)2 - potassium lithium fluoro-hydroxy-aluminosilicate) and deep pink rubellite tourmaline (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 - sodium lithium hydroxy-boro-aluminosilicate).

The lithia pegmatites occur as pockets within the granitic Pala Pegmatite (Peninsula Ranges Batholith/Southern California Batholith). The Pala Pegmatite was emplaced about 104-105 million years ago, during the Albian Stage of the late Early Cretaceous.

Locality: Stewart Mine, NNE of the town of Pala, northwestern San Diego County, southern California, USA (33º 22’ 52” North, 117º 03’ 49” West).
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Source Lithia pegmatite with rubellite tourmaline in lepidolite mica matrix (Pala Pegmatite, Early Cretaceous, 104-105 Ma; Stewart Mine, southern California, USA) 3
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14815799138. It was reviewed on 23 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

23 August 2014

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