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pitchstone - a silica rich volcanic glass - dramatic hand/display specimen with flow folding of trains of microscopic felsic crystals

$ 15.00

Pitchstone is a volcanic glass similar to obsidian but which contains more water, often has a waxy appearance and has an irregular hackly fracture, not the smooth conchoidal fracture of obsidian. It forms from a silica-rich lava, often occurring as dikes and showing fluid flow structures.

This pitchstone formed the selvages of rhyolitic dikes. It has trains of microscopic felsic crystals that show that the flowage was turbulent and not smoothly parallel to the dike walls.

Collected in the Dublin Hills, Inyo County, California, approximately 3.5 miles WSW of the town of Shoshone.

Dramatic example, roughly 1 " thick. The pencil is 5" long, for scale.  

 

 

 

Select a specimen: When more than one specimen is shown, you can select a particular specimen by telling us what is in the photo with it, a black and silver pen, a black mechanical pencil, a blue and silver pen, or one of those plus some number of coins, or you can let us make the selection.

Cut flat on both sides. The edge shows the waxy surface characteristic of pitchstone.

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