Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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

Seixoso Mine, Seixoso Mining Field, Borba de Godim, Vila Cova da Lixa e Borba de Godim, Felgueiras, Porto, Portugali
Regional Level Types
Seixoso MineMine
Seixoso Mining FieldMining Field
Borba de GodimCivil Parish
Vila Cova da Lixa e Borba de GodimCivil Parish
FelgueirasMunicipality
PortoDistrict
PortugalCountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
Latitude & Longitude (WGS84):
41° 20' 18'' North , 8° 6' 49'' West
Latitude & Longitude (decimal):
Type:
Nearest Settlements:
PlacePopulationDistance
Telões4,675 (2018)3.1km
Figueiró4,579 (2018)6.3km
Felgueiras58,065 (2018)7.5km
Amarante6,782 (2018)7.7km
Margaride10,652 (2018)7.8km
Mindat Locality ID:
64975
Long-form identifier:
mindat:1:2:64975:0
GUID (UUID V4):
0
Name(s) in local language(s):
Pedreira do Seixoso, Borba de Godim, Felgueiras, Distrito do Porto, Portugal


Quartz-feldspar mine.

Mine C-22.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


6 valid minerals.

Detailed Mineral List:

'Feldspar Group'
Ferronigerite-2N1S ?
Formula: (Al,Fe,Zn)2(Al,Sn)6O11(OH)
Description: The reference for ferronigerite-2N1S is from 1965 and it's unclear which local mine was sampled. The author's analysis is of ferronigerite, however (although not done with modern in-situ methods). Nonetheless, newer EPMA data show zinconigerite-2N1S is present from the Seixoso mine. So even if both species are present, they would not appear to be distinguishable from hand sample properties alone. So ID should ideally be "ferronigerite-2N1S/zinconigerite-2N1S series" in lieu of analytical data confirming one or the other end-member. EPMA analyses on purported ferronigerite-2N1S from this specific mine would be valuable to confirm the presence of the species at this locality. (FKM)
Gahnite
Formula: ZnAl2O4
'Mica Group'
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Quartz
Formula: SiO2
Vivianite
Formula: Fe2+Fe2+2(PO4)2 · 8H2O
Zinconigerite-2N1S
Formula: (Zn,Al,Mg)2(Al,Sn)6O11(OH)

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Gahnite4.BB.05ZnAl2O4
Quartz4.DA.05SiO2
Ferronigerite-2N1S ?4.FC.20(Al,Fe,Zn)2(Al,Sn)6O11(OH)
Zinconigerite-2N1S4.FC.20(Zn,Al,Mg)2(Al,Sn)6O11(OH)
Group 8 - Phosphates, Arsenates and Vanadates
Vivianite8.CE.40Fe2+Fe2+2(PO4)2 · 8H2O
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified
'Feldspar Group'-
'Mica Group'-

List of minerals for each chemical element

HHydrogen
H MuscoviteKAl2(AlSi3O10)(OH)2
H Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)
H VivianiteFe2+Fe22+(PO4)2 · 8H2O
H Zinconigerite-2N1S(Zn,Al,Mg)2(Al,Sn)6O11(OH)
OOxygen
O GahniteZnAl2O4
O MuscoviteKAl2(AlSi3O10)(OH)2
O Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)
O QuartzSiO2
O VivianiteFe2+Fe22+(PO4)2 · 8H2O
O Zinconigerite-2N1S(Zn,Al,Mg)2(Al,Sn)6O11(OH)
MgMagnesium
Mg Zinconigerite-2N1S(Zn,Al,Mg)2(Al,Sn)6O11(OH)
AlAluminium
Al GahniteZnAl2O4
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)
Al Zinconigerite-2N1S(Zn,Al,Mg)2(Al,Sn)6O11(OH)
SiSilicon
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
PPhosphorus
P VivianiteFe2+Fe22+(PO4)2 · 8H2O
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
FeIron
Fe Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)
Fe VivianiteFe2+Fe22+(PO4)2 · 8H2O
ZnZinc
Zn GahniteZnAl2O4
Zn Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)
Zn Zinconigerite-2N1S(Zn,Al,Mg)2(Al,Sn)6O11(OH)
SnTin
Sn Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)
Sn Zinconigerite-2N1S(Zn,Al,Mg)2(Al,Sn)6O11(OH)

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate
EuropeContinent

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

 
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 6, 2026 06:09:06 Page updated: August 9, 2025 02:54:43
Go to top of page