Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Robertson Pit, Mason County, Washington, USAi
Regional Level Types
Robertson PitPit
Mason CountyCounty
WashingtonState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
03808750017272033836343.jpg
Independence Day at Robertson Pit

Robertson Pit, Mason County, Washington, USA
07698120017272045856756.jpg
Natrolite, etc.

Robertson Pit, Mason County, Washington, USA
00495390017272045874792.jpg
Natrolite

Robertson Pit, Mason County, Washington, USA
03808750017272033836343.jpg
Independence Day at Robertson Pit

Robertson Pit, Mason County, Washington, USA
07698120017272045856756.jpg
Natrolite, etc.

Robertson Pit, Mason County, Washington, USA
09713390017272038677857.jpg
Natrolite

Robertson Pit, Mason County, Washington, USA
03808750017272033836343.jpg
Independence Day at Robertson Pit

Robertson Pit, Mason County, Washington, USA
07698120017272045856756.jpg
Natrolite, etc.

Robertson Pit, Mason County, Washington, USA
Latitude & Longitude (WGS84):
47° 11' 17'' North , 123° 17' 16'' West
Latitude & Longitude (decimal):
47.18832,-123.28804
GRN:
N32W61
Type:
Pit
Köppen climate type:
Csb : Warm-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Shelton9,834 (2011)14.5km
McCleary1,618 (2017)15.1km
Skokomish617 (2011)18.9km
Elma3,034 (2017)22.5km
Union631 (2011)23.3km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Washington Agate and Mineral SocietyOlympia, Washington34km
Mindat Locality ID:
19746
Long-form identifier:
mindat:1:2:19746:0
GUID (UUID V4):
0
Other/historical names associated with this locality:
Robertson Quarry


A traprock quarry in Eocene submarine pillow basalt of the Crescent formation.
Owned by Simpson Timber Co., Shelton, WA.
Located 3.5 miles SW of Dayton.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


5 valid minerals.

Paragenesis


Zeolites of the World, Rudy W. Tschernich, 1992

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘPyrite2.EB.05aFeS2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
Group 9 - Silicates
ⓘMesolite9.GA.05Na2Ca2Si9Al6O30 · 8H2O
ⓘNatrolite9.GA.05Na2Al2Si3O10 · 2H2O
ⓘAnalcime9.GB.05Na(AlSi2O6) · H2O
Unclassified
ⓘ'Chabazite'-
ⓘ'Smectite Group'-A0.3D2-3[T4O10]Z2 · nH2O

List of minerals for each chemical element

HHydrogen
Hⓘ AnalcimeNa(AlSi2O6) · H2O
Hⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
Hⓘ NatroliteNa2Al2Si3O10 · 2H2O
Hⓘ Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
CCarbon
Cⓘ CalciteCaCO3
OOxygen
Oⓘ AnalcimeNa(AlSi2O6) · H2O
Oⓘ CalciteCaCO3
Oⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
Oⓘ NatroliteNa2Al2Si3O10 · 2H2O
Oⓘ Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
NaSodium
Naⓘ AnalcimeNa(AlSi2O6) · H2O
Naⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
Naⓘ NatroliteNa2Al2Si3O10 · 2H2O
AlAluminium
Alⓘ AnalcimeNa(AlSi2O6) · H2O
Alⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
Alⓘ NatroliteNa2Al2Si3O10 · 2H2O
SiSilicon
Siⓘ AnalcimeNa(AlSi2O6) · H2O
Siⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
Siⓘ NatroliteNa2Al2Si3O10 · 2H2O
SSulfur
Sⓘ PyriteFeS2
CaCalcium
Caⓘ CalciteCaCO3
Caⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
FeIron
Feⓘ PyriteFeS2

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Lasmanis, Raymond (1988) Minerals of the Crescent Formation, Robertson Pit, Mason County, Washington. Rocks & Minerals, 63 (1) 25-28 doi:10.1080/00357529.1988.11761812
Tschernich, R.W. (1989) Notes on the zeolites from the Robertson Pit, Dayton, Mason County, Washington. Micro Probe, V 6, No. 8, p. 15.
Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc. 567pp.
Quick NavTopCommoditiesMineral ListParagenesisOther RegionsReferences
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 3, 2026 11:49:31 Page updated: February 2, 2026 13:01:47
Go to top of page