VESPER PEAK SKARN Snohomish County, Washington, USA

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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 (Cannon,1991) CLICK for PHOTOGRAPHED

Apatite- Ca5(PO4)3(Cl)    Calcite- CaCO2    Chalcopyrite-    Clinozoisite    Ferro-axinite- *Garnet (var. grossular)- *Hedenbergite- CaFe2+(Si2O6)

Laumontite-    Molybdenite-    Parawollastonite-    Prehnite-    Pyrrhotite-    Quartz- SiO2    Titanite-

* photographed

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Grossular GARNET

HEDENBERGITE

PREHNITE

REFERENCES
Cannon, Bart, (November-December 1991) The Vesper Peak Garnet Deposit, Snohomish County, Washington. Rocks & Minerals. 66(06), 478-484.