DENNY MOUNTAIN SKARN
near North Bend, King County, Washington, USA

LOCALITY IMAGES


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

The Denny Mountain skarn (tactite) deposit is exposed in a deep canyon drainage that flows into Denny Creek. The skarn formed by metasomatism of Jurassic/Triassic age sedimentary rocks during intrusion of the Snoqualmie Batholith.


MINERALS (complete list) CLICK for PHOTOGRAPHED
  Actinolite (Byssolite)- Ca2(Mg,Fe)5(Si8O22)(OH)2
*Calcite- CaCO3
  Diopside- (Ca,Mg)SiO3
  Epidote- Ca2Al3Si3O12(OH)
*Garnet (Grossular)- Ca3Al2Si3O12
  Goethite- FeO(OH)
*Hedenbergite- CaFe2+Si2O5
*Hematite- Fe2O3
  Malachite- Cu2CO3(OH)2
*Orthoclase (Adularia)- KAlSi3O8
  Pyrite- FeS2
*Quartz- SiO2
*Scheelite- CaWO4
* photographed
 
Grossular GARNET  
and
CALCITE
 
HEDENBERGITE
 
HEMATITE rose

 
EPIDOTE, QUARTZ
 
QUARTZ  with chlorite inclusions
and red
 GROSSULAR  garnet

 
Raspberry QUARTZ  scepter
with
 HEMATITE  inclusions and rosettes
 
Raspberry QUARTZ  scepter cluster
with
 HEMATITE inclusions
 
Raspberry QUARTZ  (Var: Amethyst) scepter
with
 HEMATITE inclusions

John Lindell Collection

 
Raspberry QUARTZ  scepter
with
 HEMATITE inclusions
 
Raspberry QUARTZ  scepter cluster
with
 HEMATITE inclusions
 
QUARTZ with HEMATITE

 
Double-terminated
Japan-law twin
QUARTZ
 
Japan-law twin QUARTZ
 
Sceptered QUARTZ

 
Botryodal blue OPAL
John Lindell Collection
 
SCHEELITE
 
ORTHOCLASE
(ADULARIA)



REFERENCES
(Under Construction)