Vote for your favorite mineral in #MinCup26! - Pyromorphite vs. Graphite
Linked by archaic translations and mineralogical misunderstandings, the quarterfinals are ending in hexagons with vivid pyromorphite vs writeable graphite.
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

Guañape Islands, Virù Province, La Libertad, Perui
Regional Level Types
Guañape IslandsGroup of Islands
Virù ProvinceProvince
La LibertadRegion
PeruCountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
04417280017272005229367.jpg
Processing guano

Guañape Islands, Virù Province, La Libertad, Peru
03527670017271921494509.jpg
Biphosphammite

Guañape Islands, Virù Province, La Libertad, Peru
06491630017271925802685.jpg
Phosphammite

Guañape Islands, Virù Province, La Libertad, Peru
04417280017272005229367.jpg
Processing guano

Guañape Islands, Virù Province, La Libertad, Peru
03527670017271921494509.jpg
Biphosphammite

Guañape Islands, Virù Province, La Libertad, Peru
06491630017271925802685.jpg
Phosphammite

Guañape Islands, Virù Province, La Libertad, Peru
04417280017272005229367.jpg
Processing guano

Guañape Islands, Virù Province, La Libertad, Peru
03527670017271921494509.jpg
Biphosphammite

Guañape Islands, Virù Province, La Libertad, Peru
Latitude & Longitude (WGS84):
8° 32' 5'' South , 78° 57' 45'' West
Latitude & Longitude (decimal):
-8.53488,-78.96265
GRN:
S06W55
Type:
Group of Islands
Köppen climate type:
BWh : Hot deserts climate
Mindat Locality ID:
2550
Long-form identifier:
mindat:1:2:2550:1
GUID (UUID V4):
0
Name(s) in local language(s):
Islas Guañape


Islands south of Trujillo with large guano deposits.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


8 valid minerals. 1 (TL) - type locality of valid minerals.

Detailed Mineral List:

ⓘ Aphthitalite
Formula: K3Na(SO4)2
ⓘ Aphthitalite var. Ammonium-Aphthitalite
Formula: Na(K,NH4)SO4
ⓘ Biphosphammite
Formula: NH4(H2PO4)
ⓘ Mascagnite
Formula: (NH4)2SO4
ⓘ Oxammite (TL)
Formula: (NH4)2(C2O4) · H2O
Type Locality:
ⓘ Phosphammite
Formula: (NH4)2(PO3OH)
ⓘ Salammoniac
Formula: NH4Cl
ⓘ Stercorite
Formula: (NH4)Na(PO3OH) · 4H2O
ⓘ Teschemacherite
Formula: (NH4)HCO3

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 3 - Halides
ⓘSalammoniac3.AA.25NH4Cl
Group 5 - Nitrates and Carbonates
ⓘTeschemacherite5.AA.25(NH4)HCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘAphthitalite
var. Ammonium-Aphthitalite		7.AC.35Na(K,NH4)SO4
ⓘ7.AC.35K3Na(SO4)2
ⓘMascagnite7.AD.05(NH4)2SO4
Group 8 - Phosphates, Arsenates and Vanadates
ⓘBiphosphammite8.AD.15NH4(H2PO4)
ⓘPhosphammite8.AD.20(NH4)2(PO3OH)
ⓘStercorite8.CJ.05(NH4)Na(PO3OH) · 4H2O
Group 10 - Organic Compounds
ⓘOxammite (TL)10.AB.55(NH4)2(C2O4) · H2O

List of minerals for each chemical element

HHydrogen
Hⓘ Aphthitalite var. Ammonium-AphthitaliteNa(K,NH4)SO4
Hⓘ BiphosphammiteNH4(H2PO4)
Hⓘ Mascagnite(NH4)2SO4
Hⓘ Oxammite(NH4)2(C2O4) · H2O
Hⓘ Phosphammite(NH4)2(PO3OH)
Hⓘ SalammoniacNH4Cl
Hⓘ Stercorite(NH4)Na(PO3OH) · 4H2O
Hⓘ Teschemacherite(NH4)HCO3
CCarbon
Cⓘ Oxammite(NH4)2(C2O4) · H2O
Cⓘ Teschemacherite(NH4)HCO3
NNitrogen
Nⓘ Aphthitalite var. Ammonium-AphthitaliteNa(K,NH4)SO4
Nⓘ BiphosphammiteNH4(H2PO4)
Nⓘ Mascagnite(NH4)2SO4
Nⓘ Oxammite(NH4)2(C2O4) · H2O
Nⓘ Phosphammite(NH4)2(PO3OH)
Nⓘ SalammoniacNH4Cl
Nⓘ Stercorite(NH4)Na(PO3OH) · 4H2O
Nⓘ Teschemacherite(NH4)HCO3
OOxygen
Oⓘ Aphthitalite var. Ammonium-AphthitaliteNa(K,NH4)SO4
Oⓘ AphthitaliteK3Na(SO4)2
Oⓘ BiphosphammiteNH4(H2PO4)
Oⓘ Mascagnite(NH4)2SO4
Oⓘ Oxammite(NH4)2(C2O4) · H2O
Oⓘ Phosphammite(NH4)2(PO3OH)
Oⓘ Stercorite(NH4)Na(PO3OH) · 4H2O
Oⓘ Teschemacherite(NH4)HCO3
NaSodium
Naⓘ Aphthitalite var. Ammonium-AphthitaliteNa(K,NH4)SO4
Naⓘ AphthitaliteK3Na(SO4)2
Naⓘ Stercorite(NH4)Na(PO3OH) · 4H2O
PPhosphorus
Pⓘ BiphosphammiteNH4(H2PO4)
Pⓘ Phosphammite(NH4)2(PO3OH)
Pⓘ Stercorite(NH4)Na(PO3OH) · 4H2O
SSulfur
Sⓘ Aphthitalite var. Ammonium-AphthitaliteNa(K,NH4)SO4
Sⓘ AphthitaliteK3Na(SO4)2
Sⓘ Mascagnite(NH4)2SO4
ClChlorine
Clⓘ SalammoniacNH4Cl
KPotassium
Kⓘ Aphthitalite var. Ammonium-AphthitaliteNa(K,NH4)SO4
Kⓘ AphthitaliteK3Na(SO4)2

Other Regions, Features and Areas containing this locality

Pacific OceanOcean
South 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

Shepard, C.U. (1870) Notice of the Guanape Island guano. The Rural Carolinian: 1: 469-471.
Palache, Charles; Berman, Harry; Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons.pages 399,1104
Winchell, Horace, Benoit, Richard J. (1951) Taylorite, mascagnite, aphthitalite, lecontite, and oxammite from guano. American Mineralogist, 36 (7-8) 590-602
Bridge, P. J. (1973) Urea, a new mineral, and neotype phosphammite from Western Australia. Mineralogical Magazine, 39 (303) 346-348 doi:10.1180/minmag.1973.039.303.11
Quick NavTopMineral ListOther 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 28, 2026 23:55:03 Page updated: May 8, 2026 12:28:32
Go to top of page