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Alverson Mine, La Conner, Skagit Co., Washington, USA

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Latitude & Longitude (WGS84): 48° 23' North , 122° 30' West
Latitude & Longitude (decimal): 48.38333,-122.50000
GeoHash:G#: c28ghryjr
Locality type:Mine
Köppen climate type:Csb : Warm-summer Mediterranean climate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

6 valid minerals.

Detailed Mineral List:

Formula: CaCO3
Reference: Minerals of Washington, Bart Cannon, 1975
Formula: SrSO4
Habit: massive viens; bladed crystaline aggregates
Colour: white to light blue
Description: Occurs in veins in a fault zone in dunite.
Reference: Cannon, B. (1975): Minerals of Washington, p.67
Formula: Mg3(AsO4)2 · 8H2O
Reference: Bart Cannon
Formula: SiO2
Reference: Bart Cannon
Formula: As4S4
Reference: Minerals of Washington, Bart Cannon, 1975
Formula: SrCO3
Habit: botryoidal
Colour: white
Reference: Cannon, B. (1975): Minerals of Washington, p.67

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Group 8 - Phosphates, Arsenates and Vanadates
'Hörnesite'8.CE.40Mg3(AsO4)2 · 8H2O

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Hörnesite40.3.6.7Mg3(AsO4)2 · 8H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si

List of minerals for each chemical element

H HörnesiteMg3(AsO4)2 · 8H2O
C CalciteCaCO3
C StrontianiteSrCO3
O CalciteCaCO3
O CelestineSrSO4
O HörnesiteMg3(AsO4)2 · 8H2O
O QuartzSiO2
O StrontianiteSrCO3
Mg HörnesiteMg3(AsO4)2 · 8H2O
Si QuartzSiO2
S CelestineSrSO4
S RealgarAs4S4
Ca CalciteCaCO3
As HörnesiteMg3(AsO4)2 · 8H2O
As RealgarAs4S4
Sr CelestineSrSO4
Sr StrontianiteSrCO3

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

0 - 2.588 Ma

ID: 3185691
Cenozoic sedimentary rocks

Age: Pleistocene (0 - 2.588 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

0 - 0.0117 Ma

ID: 1399390

Age: Anthropocene (0 - 0.0117 Ma)

Lithology: Artificial fill, including modified land

Reference: Washington State Department of Natural Resources, Division of Geology and Earth Resources. Washington Interactive Geologic Map: 1:100,000 scale. Washington Division of Geology and Earth Resources. [19]

Late Cretaceous - Jurassic
66 - 201.3 Ma

ID: 2942535
Upper Jurassic-Lower Cretaceous sedimentary and volcanic rocks

Age: Mesozoic (66 - 201.3 Ma)

Stratigraphic Name: Spieden Group; Obstruction Formation; Fidalgo Complex; Lummi Group; Lopez Structural Complex; Newby Group: Buck Mountain Formation; Twisp Formation

Description: Sedimentary and volcanic rocks, undivided. Graywacke, argillite, siltstone, slate, volcanic rocks, phyllite, greenschist, and greenstone.

Comments: Volcanic rocks include andesite flows, tuff, and breccia with minor dacite and basalt, and minor volcaniclastic sandstone, conglomerate, and siltstone (Barksdale, 1975, Tabor and others, 1993--NOTE: Tabor and others, 1993, does not differentiate between WAJK and WAJKv). Huntting and others, 1961, originally listed"Leech River Group" in the stratigraphy of this unit; obsolete term and now considered part of Lummi and Constitution Formations (Brandon and others, 1988). Original map source: Raines, Gary L., and Johnson, Bruce R., 1996, Digital representation of the Washington state geologic map; a contribution to the Interior Columbia River basin ecosystem management project, U.S. Geological Survey Open-file report 95-0684, 20 p., plus digi

Lithology: Major:{graywacke,argillite,siltstone}, Minor:{slate,andesite,phyllite,schist,greenstone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License


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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 418.
Cannon, B. (1975): Minerals of Washington, p.67.

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