SUPPORT US. If is important to you, click here to donate to our Fall 2019 fundraiser!
Log InRegister
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 ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Croas an Nivit, Plélauff, Côtes-d'Armor, Brittany, Francei
Regional Level Types
Croas an Nivit- not defined -
Plélauff- not defined -

This page is currently not sponsored. Click here to sponsor this page.
Lock Map
Name(s) in local language(s):Croas an Nivit, Plélauff, Côtes-d'Armor, Brittany, France
Latitude & Longitude (WGS84): 48° 11' 0'' North , 3° 13' 4'' West
Latitude & Longitude (decimal): 48.18352,-3.21793
GeoHash:G#: gbtdng8c2
Köppen climate type:Cfb : Temperate oceanic climate
Nearest Settlements:
Plélauff719 (2016)2.6km
Lescouët-Gouarec197 (2016)3.2km
Perret196 (2017)4.5km
Gouarec1,081 (2016)5.6km
Mellionnec463 (2016)5.9km
Other/historical names associated with this locality:Croaz an Nivit

In the fields near an old roadside quarry, one can find many orthoclase crystals.

The matrix (Rostrenen granite) is locally altered.

It is also possible to find pegmatite bits with black tourmaline and green apatite.

Lukas (1978) mentions an "enormous orthoclase deposit, easily exploitable and of exceptional quality (12% potassium) discovered near Plélauff at 'Kerbrien-an-Nivit' (sic), containing over 400,000 tons of pure potassium feldspar." [Kerbrien is located a bit further southeast, near and part of Lescouët-Gouarec].

Regions containing this locality

Eurasian PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

2 valid minerals.

Detailed Mineral List:

Formula: K(AlSi3O8)
Reference: Pierrot, R., Chauris, L., and Laforêt, C. (1976) Inventaire minéralogique de la France n°5 Côtes-du-Nord.; Lukas, Yann (1978) Roches et minéraux de Bretagne. Editions Ouest-France, 33 pp.
Formula: K(AlSi3O8)
Reference: Lukas, Yann (1978) Roches et minéraux de Bretagne. Editions Ouest-France, 33 pp.

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates

List of minerals arranged by Dana 8th Edition classification

Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks

List of minerals for each chemical element

O MicroclineK(AlSi3O8)
O OrthoclaseK(AlSi3O8)
Al MicroclineK(AlSi3O8)
Al OrthoclaseK(AlSi3O8)
Si MicroclineK(AlSi3O8)
Si OrthoclaseK(AlSi3O8)
K MicroclineK(AlSi3O8)
K OrthoclaseK(AlSi3O8)

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Devonian - Silurian
358.9 - 443.8 Ma

ID: 3184835
Paleozoic sedimentary rocks

Age: Paleozoic (358.9 - 443.8 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Early Devonian
393.3 - 419.2 Ma

ID: 3131119
detrital deposit

Age: Early Devonian (393.3 - 419.2 Ma)

Description: low grade metamorphic

Lithology: Quartzite

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Pierrot, R., Chauris, L., and Laforêt, C. (1976) Inventaire minéralogique de la France n°5 Côtes-du-Nord.
Lukas, Yann (1978) Roches et minéraux de Bretagne. Editions Ouest-France, 33 pp. [p. 24.]

This page contains all mineral locality references listed on 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 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.
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: November 18, 2019 11:31:03 Page generated: March 21, 2019 01:22:52
Go to top of page