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

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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:
PlacePopulationDistance
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
EuropeContinent

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


2 valid minerals.

Detailed Mineral List:

Microcline
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.
Orthoclase
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
Microcline9.FA.30K(AlSi3O8)
Orthoclase9.FA.30K(AlSi3O8)

List of minerals arranged by Dana 8th Edition classification

Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Microcline76.1.1.5K(AlSi3O8)
Orthoclase76.1.1.1K(AlSi3O8)

List of minerals for each chemical element

OOxygen
O MicroclineK(AlSi3O8)
O OrthoclaseK(AlSi3O8)
AlAluminium
Al MicroclineK(AlSi3O8)
Al OrthoclaseK(AlSi3O8)
SiSilicon
Si MicroclineK(AlSi3O8)
Si OrthoclaseK(AlSi3O8)
KPotassium
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 Macrostrat.org

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

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.]


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