DENNY MOUNTAIN SKARN
near North Bend, King County, Washington

LOCALITY IMAGES


GEOLOGY
Skarn Deposit, periphery of Snoqualmie Batholith - late Oligocene to early Miocene (28 Ma[million years ago] to 22 Ma).
(Under Construction)

MINERALS (incomplete list) CLICK for COMPLETE LIST
*Calcite-
CaCO3 - Massive cystals fill mineralized voids. Etching away the massive calcite often reveals well-preserved mineral species that cystallized before the calcite.
*Garnet(Grossular)-
Ca3Al2Si3O12 - Occurs as translucent to opaque brownish-red dodecohedron
*Hematite-
Fe2O3 - Occurs as massive platey aggregates of lustrous silver crystals. Also occurs as terminated rosettes, typically enclosed in calcite.
*Lepidocrocite-
gamma-FeO(OH) - Occurs as mm-scale red inclusions in quartz crystals ("raspberry" scepters).
*Quartz-
SiO2 - Occurs as crystals of varying size, quality and habits. Japan-law twins and raspberry scepters (quartz with worm-like lepidocrosite inclusrions) are highly sought after by collectors.
*Scheelite-
CaWO4 - Occurs as mm-scale golden-yellow pseudo-octahedron associated with other skarn mineralogy. Crystals fluoresce blue under short-wave ultraviolet light.
* photographed
 
Grossular GARNET  
and
CALCITE
 
Raspberry QUARTZ  
scepter with
 
LEPIDOCROCITE 
inclusions
 
HEMATITE rose

 
Japan Law Twin QUARTZ
 
Raspberry QUARTZ  
scepter cluster with
 
LEPIDOCROCITE inclusions

 
SCHEELITE


REFERENCES
(Under Construction)