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Milliau Island, Trébeurden, Côtes-d'Armor, Brittany, Francei
Regional Level Types
Milliau IslandIsland
Trébeurden- not defined -

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Name(s) in local language(s):Île Milliau, Trébeurden, Côtes-d'Armor, Bretagne, France
Latitude & Longitude (WGS84): 48° 46' 4'' North , 3° 35' 43'' West
Latitude & Longitude (decimal): 48.76784,-3.59532
GeoHash:G#: gbtmqjvvr
Locality type:Island
Age:300 MY (for the granite intrusio Ma
Geologic Time:Pennsylvanian
Köppen climate type:Cfb : Temperate oceanic climate

An island on the coast of Trébeurden, only accessible at low tide (take care!). The northern part is formed by the "granite rose" (pink granit) of Ploumanac'h, and the southern part by sedimentary rocks of unknown age. These are varves, with a well developed layer structure. Near the contact, the felsic layers of the varves underwent contact metamorphosis, resulting in the forming of cordierite, andalousite and sillimanite.

Regions containing this locality

Eurasian PlateTectonic Plate

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Standard Detailed Strunz Dana Chemical Elements

Mineral List

5 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

Detailed Mineral List:

Formula: Al2(SiO4)O
Reference: Pierrick Graviou "Géotourisme en Côtes-d'Armor", Société Géologique et Minéralogique de Bretagne, 2012, 96 pages Erik Vercammen collection and field observations
Formula: (Mg,Fe)2Al3(AlSi5O18)
Reference: Erik Vercammen collection and field observations
Formula: Fe2+Fe3+2O4
Reference: Erik Vercammen field observation and collection
Formula: SiO2
Reference: Chauris, L. (2014) Minéraux de Bretagne, Les Editions du Piat, 108.
Formula: Al2(SiO4)O
Reference: Pierrick Graviou "Géotourisme en Côtes-d'Armor", Société Géologique et Minéralogique de Bretagne, 2012, 96 pages Erik Vercammen collection and field observations

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Group 9 - Silicates

List of minerals arranged by Dana 8th Edition classification

Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with Al substituted rings
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si

List of minerals for each chemical element

O Cordierite(Mg,Fe)2Al3(AlSi5O18)
O AndalusiteAl2(SiO4)O
O SillimaniteAl2(SiO4)O
O QuartzSiO2
O MagnetiteFe2+Fe23+O4
Mg Cordierite(Mg,Fe)2Al3(AlSi5O18)
Al Cordierite(Mg,Fe)2Al3(AlSi5O18)
Al AndalusiteAl2(SiO4)O
Al SillimaniteAl2(SiO4)O
Si Cordierite(Mg,Fe)2Al3(AlSi5O18)
Si AndalusiteAl2(SiO4)O
Si SillimaniteAl2(SiO4)O
Si QuartzSiO2
Fe Cordierite(Mg,Fe)2Al3(AlSi5O18)
Fe MagnetiteFe2+Fe23+O4


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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Pierrick Graviou "Géotourisme en Côtes-d'Armor", Société Géologique et Minéralogique de Bretagne, 2012, 96 pages

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