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

Companheiro No. 3 quarry, U.F Romãs Decermilo e Vila Longa, Sátão, Viseu, Portugali
Regional Level Types
Companheiro No. 3 quarryQuarry (Inactive)
U.F Romãs Decermilo e Vila LongaCivil Parish
SátãoMunicipality
ViseuDistrict
PortugalCountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
Latitude & Longitude (WGS84):
40° 44' 12'' North , 7° 35' 27'' West
Latitude & Longitude (decimal):
Type:
Quarry (Inactive) - last checked 2022
Nearest Settlements:
PlacePopulationDistance
Cortiçada341 (2018)5.2km
Pinheiro232 (2018)7.5km
Valverde203 (2018)7.9km
Eirado230 (2018)9.6km
Aguiar da Beira5,473 (2018)9.8km
Mindat Locality ID:
55944
Long-form identifier:
mindat:1:2:55944:8
GUID (UUID V4):
0
Name(s) in local language(s):
Companheiro No. 3, Sezures, Penalva do Castelo, Distrito de Viseu, Portugal


This quartz-feldspar mine consists of a big old quarry and a well-worth-seeing underground mining area. This mine closed a long time ago, maybe in the 1980s; some dumps are visible nowadays.
Another extraction for a short time began in 2010 in the area below. During this time the situation for mineral collecting was quite good.
Some years later a water reservoir for fire protection was constructed here.

Some old and small open-pit mines are also located in this area, but most of them are totally overgrown.

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.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
'Apatite'
Formula: Ca5(PO4)3A
Beryl
Formula: Be3Al2(Si6O18)
Description: Klaus Ludwig collection.
Beryl var. Aquamarine
'Columbite-(Fe)-Columbite-(Mn) Series'
Orthoclase
Formula: K(AlSi3O8)
Phenakite
Formula: Be2SiO4
Quartz
Formula: SiO2
Quartz var. Smoky Quartz
Formula: SiO2

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var. Smoky Quartz4.DA.05SiO2
Group 9 - Silicates
Phenakite9.AA.05Be2SiO4
Beryl
var. Aquamarine
9.CJ.05Be3Al2(Si6O18)
9.CJ.05Be3Al2(Si6O18)
Orthoclase9.FA.30K(AlSi3O8)
Albite9.FA.35Na(AlSi3O8)
Unclassified
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Apatite'-Ca5(PO4)3A

List of minerals for each chemical element

BeBeryllium
Be BerylBe3Al2(Si6O18)
Be PhenakiteBe2SiO4
OOxygen
O AlbiteNa(AlSi3O8)
O BerylBe3Al2(Si6O18)
O OrthoclaseK(AlSi3O8)
O PhenakiteBe2SiO4
O QuartzSiO2
O Quartz var. Smoky QuartzSiO2
O Columbite-(Fe)-Columbite-(Mn) Series
O ApatiteCa5(PO4)3A
NaSodium
Na AlbiteNa(AlSi3O8)
AlAluminium
Al AlbiteNa(AlSi3O8)
Al BerylBe3Al2(Si6O18)
Al OrthoclaseK(AlSi3O8)
SiSilicon
Si AlbiteNa(AlSi3O8)
Si BerylBe3Al2(Si6O18)
Si OrthoclaseK(AlSi3O8)
Si PhenakiteBe2SiO4
Si QuartzSiO2
Si Quartz var. Smoky QuartzSiO2
PPhosphorus
P ApatiteCa5(PO4)3A
KPotassium
K OrthoclaseK(AlSi3O8)
CaCalcium
Ca ApatiteCa5(PO4)3A
MnManganese
Mn Columbite-(Fe)-Columbite-(Mn) Series
FeIron
Fe Columbite-(Fe)-Columbite-(Mn) Series
NbNiobium
Nb Columbite-(Fe)-Columbite-(Mn) Series

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.
 
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 02:30:48 Page updated: May 10, 2026 17:03:44
Go to top of page