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West Fault breccia, Spruce claim (Spruce Ridge), Goldmyer Hot Springs, King Co., Washington, USAi
Regional Level Types
West Fault breccia- not defined -
Spruce claim (Spruce Ridge)Claim
Goldmyer Hot SpringsHot Springs
King Co.County
WashingtonState
USACountry

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Key
Latitude & Longitude (WGS84):
47° North , 121° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~2km


One of four breccia bodies on the Spruce property, located near the north-west corner of Spruce 15. The locality is just west of the high angle fault that truncates the west side of the main Spruce breccia. Discovered when visitor Don Meyer walked down the talus slope below the working bench in 1980 to retrieve a partial roll of det cord. Don spotted a small amethyst scepter lying in a clump of swordferns. Our first blast there opened a one meter-long pocket lined with pyrite-included transparent quartz crystals to 2 cm. West Fault was worked from 1980 to 1997 and was thought to be exhausted, but recent work has delineated an additional vuggy zone. It produces the same minerals as the main Spruce breccia, but average crystal size is much smaller, with an abundance of scepters and Japan twins.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Detailed Mineral List:

Baryte
Formula: BaSO4
Description: Crystals frequently in tabular rosettes, often perched on quartz crystals.
Reference: Lasmanis, Ray (1991) Rocks & Minerals 60: 316-20
Calcite
Formula: CaCO3
Reference: Lasmanis, Ray (1991) Rocks & Minerals 60: 316-20
Gold
Formula: Au
Description: Only found as inclusions in quartz crystals, usually as thin films producing metallic phantoms. Films have distinct octohedral markings under magnification.
Reference: Lasmanis, Ray (1991) Rocks & Minerals 60: 316-20
Pyrite
Formula: FeS2
Colour: silvery
Description: Very small compared to Spruce breccia pyrite specimens. Largest so far is under 2 cm.
Reference: Lasmanis, Ray (1991) Rocks & Minerals 60: 316-20
Quartz
Formula: SiO2
Colour: clear to amethystine
Description: frequently doubly terminated, Japan twins and scepters common. Abundant euhedral pyrite inclusions, sometimes creating phantoms.
Reference: Lasmanis, Ray (1991) Rocks & Minerals 60: 316-20

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2

List of minerals for each chemical element

CCarbon
C CalciteCaCO3
OOxygen
O BaryteBaSO4
O QuartzSiO2
O CalciteCaCO3
SiSilicon
Si QuartzSiO2
SSulfur
S BaryteBaSO4
S PyriteFeS2
CaCalcium
Ca CalciteCaCO3
FeIron
Fe PyriteFeS2
BaBarium
Ba BaryteBaSO4
AuGold
Au GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Lasmanis, R. (1991), Rocks & Minerals: 66(4): 316-320.

Other Regions, Features and Areas containg this locality

North America
North America PlateTectonic Plate

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