Minerals of the Quartz Creek Mine (Rainy Mine), King County, Washington

QUARTZ CREEK (RAINY) MINE
near North Bend, King County, Washington

LOCALITY IMAGES

GEOLOGY
Mineralization is associated with intrusion of the Snoqualmie Batholith - late Oligocene to early Miocene (28 Ma[million years ago] to 22 Ma).

MINERALS


*Anthophyllite-	- Crystals are pseudomorphed to talc.
*Arsenopyrite-	FeAsS - Occurs as subhedral to euhedral grains locked in massive quartz in outcrops near the west adit.
Copper-	Cu - Occurs as micro-dendrites of native copper within massive quartz.
*Covellite-	CuS - Occurs as small anhedral grains of indigo blue/black covellite in outcrops near the east adit.
Pyrite-	FeS₂ - Occurs as massive and small grains.
Quartz-	SiO₂ - Occurs as terminated crystals to a few centimeters within cavities.
*Talc-	Mg₃Si₄O₁₀(OH)₂ - Talc pseudomorphs after anthophyllite occur in outcrop near the east adit. The pseudomorphs are tan-colored striated prismatic crystals to about 5 cm associated with massive sulfide and schorl.
Tourmaline-	- Occur as fine black sprays associated with massive sulfide in outcrops near the east adit.

* photographed

ARSENOPYRITE in QUARTZ

TALC after ANTHOPHYLLITE
with COVELLITE