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GEOLOGY
Skarn Deposit, periphery of tonalite exposed on Vesper Peak (Squire Creek stock) - Oligocene (between 33.9 million to 23 million years before the present). The skarn deposit resulted from contact metasomatism of a limestone pod in Jurassic age sedimentary rock (predominately ribbon chert) adjacent to the tonalite intrusion.
MINERALS (incomplete list) CLICK for COMPLETE LIST
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| Ca3Al2(SiO4)3 - Occurs as lustrous orange dodecahedral crystals with some crystals exhibiting cube faces. Crystals to over 2.5 cm have been found. |
| CaFe2+(Si2O6) - Occurs as dark green crystals reported up to 8 cm in length (Cannon, 1991). | |
| Ca2Al(AlSi3O10)(OH)2 - Occurs as light green to white clustered fan-like sheaths with individual crystals to about 4 cm. The prehnite is typically etched. |
* photographed
Grossular GARNET |
HEDENBERGITE |
PREHNITE |
Cannon, Bart, (November-December 1991) The Vesper Peak Garnet Deposit, Snohomish County, Wasington. Rocks & Minerals. 66(06), 478-484.
