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

Olivine Hill Mine, Cypress Island, Skagit County, Washington, USAi
Regional Level Types
Olivine Hill MineMine
Cypress IslandIsland
Skagit CountyCounty
WashingtonState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
Latitude & Longitude (WGS84):
48° 32' 37'' North , 122° 41' 13'' West
Latitude & Longitude (decimal):
48.54385,-122.68712
GeoHash:
G#: c28u0jjuq
GRN:
N33W59
Type:
Mine
Köppen climate type:
Csb : Warm-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Anacortes16,403 (2017)6.5km
Bay View696 (2011)16.8km
Edison133 (2011)18.0km
Orcas394 (2008)19.9km
La Conner927 (2017)22.3km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Mount Baker Rock And Gem ClubBellingham, Washington28km
Skagit Rock and Gem ClubMt. Vernon, Washington29km
North Puget Sound Facetors GuildMount Vernon, Washington29km
Mindat Locality ID:
68890
Long-form identifier:
mindat:1:2:68890:8
GUID (UUID V4):
0


An olivine mine on the south end of Cypress Island. Chromite is also reported to occur in unaltered dunite.

Tectonics: Active Margin (Leading Edge Of North American Plate)

Deposit: Sparsely disseminated grains of chromite in fresh unaltered dunite.

Development: Development unknown.

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


4 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘChromite4.BB.05Fe2+Cr3+2O4
Group 9 - Silicates
ⓘPectolite9.DG.05NaCa2Si3O8(OH)
ⓘXonotlite9.DG.35Ca6(Si6O17)(OH)2
ⓘPrehnite9.DP.20Ca2Al2Si3O10(OH)2
Unclassified
ⓘ'Apophyllite Group'-AB4[Si8O22]X · 8H2O
ⓘ'Chrysolite'-

List of minerals for each chemical element

HHydrogen
Hⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Hⓘ PectoliteNaCa2Si3O8(OH)
Hⓘ PrehniteCa2Al2Si3O10(OH)2
Hⓘ XonotliteCa6(Si6O17)(OH)2
OOxygen
Oⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Oⓘ ChromiteFe2+Cr23+O4
Oⓘ PectoliteNaCa2Si3O8(OH)
Oⓘ PrehniteCa2Al2Si3O10(OH)2
Oⓘ XonotliteCa6(Si6O17)(OH)2
NaSodium
Naⓘ PectoliteNaCa2Si3O8(OH)
AlAluminium
Alⓘ PrehniteCa2Al2Si3O10(OH)2
SiSilicon
Siⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Siⓘ PectoliteNaCa2Si3O8(OH)
Siⓘ PrehniteCa2Al2Si3O10(OH)2
Siⓘ XonotliteCa6(Si6O17)(OH)2
CaCalcium
Caⓘ PectoliteNaCa2Si3O8(OH)
Caⓘ PrehniteCa2Al2Si3O10(OH)2
Caⓘ XonotliteCa6(Si6O17)(OH)2
CrChromium
Crⓘ ChromiteFe2+Cr23+O4
FeIron
Feⓘ ChromiteFe2+Cr23+O4

Other Databases

Link to USGS MRDS:10092672

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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

Pages.
Valentine, Grant M., Huntting, Marshall T. (1956) Part I - Nonmetallic minerals, in Inventory of Washington Minerals. Bulletin 37, Washington Geological Survey.
Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.
Cannon, Bart (1975) Minerals of Washington. Cordilleran, Mercer Island, WA.
Quick NavTopCommoditiesMineral ListRock TypesOther DatabasesOther 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 06:00:54 Page updated: August 8, 2025 05:10:16
Go to top of page