The blue schist of Ward Creek, Cazadero, California has been described as "possibly the most intensely studied body of metamorphic rocks in the world." Well, if that's what you study . . . .
Part of the Franciscan Melange, a body of mixed metamorphic rocks paralleling the norther California coast, this is believed to have once been ocean floor basalt, then subducted 15 to 20 miles down before being 'burped' back up to the surface, and exposed.
While thin sections of this material look more green than blue, the long twisting needle like crystals are plainly visible.
Ward Creek Amphibole
The Ward Creek Amphibole is made up of quite fine needle-like crystals, which show to the best advantage with the higher power ~25X lens.
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