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Lecanvey prospect, Croagh Patrick, Co. Mayo, Irelandi
Regional Level Types
Lecanvey prospectProspect
Croagh Patrick- not defined -
Co. Mayo- not defined -
IrelandCountry

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Key
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Latitude & Longitude (WGS84): 53° 45' 39'' North , 9° 40' 26'' West
Latitude & Longitude (decimal): 53.76083,-9.67389
GeoHash:G#: gc91gfgew
Locality type:Prospect
Köppen climate type:Cfb : Temperate oceanic climate


Visible grains of gold in quartz occur about 1 km west of the summit of Croagh Patrick (veins "A" and "B"), in Clew Bay area. Often found in cubic epimorphs after pyrite. Grains only rarely exceed 2 mm. Electron probe analysis of a single grain gave approximately 84 % Au. Other assays are similar, with values of around 85 % Au.

Regions containing this locality

Eurasia Plate

Plate - 7,319 mineral species & varietal names listed

Ireland (island)

Island - 488 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


4 valid minerals.

Detailed Mineral List:

Gold
Formula: Au
Reference: UKJMM Vol.29 p.14
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Barry Flannery Collection
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Barry Flannery Collection
Pyrite
Formula: FeS2
Reference: Barry Flannery Collection
Quartz
Formula: SiO2
Reference: Barry Flannery Collection; UKJMM Vol.29 p.14

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Gold'1.AA.05Au
Group 2 - Sulphides and Sulfosalts
'Pyrite'2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
'Magnetite'4.BB.05Fe2+Fe3+2O4
'Quartz'4.DA.05SiO2
Unclassified Minerals, Rocks, etc.
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
OOxygen
O Limonite(Fe,O,OH,H2O)
O MagnetiteFe2+Fe23+O4
O QuartzSiO2
SiSilicon
Si QuartzSiO2
SSulfur
S PyriteFeS2
FeIron
Fe Limonite(Fe,O,OH,H2O)
Fe MagnetiteFe2+Fe23+O4
Fe PyriteFeS2
AuGold
Au GoldAu

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

Early Carboniferous
323.2 - 358.9 Ma



ID: 3192030
Paleozoic sedimentary rocks

Age: Mississippian (323.2 - 358.9 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]

Silurian
419.2 - 443.8 Ma



ID: 3136210
marine molasse

Age: Silurian (419.2 - 443.8 Ma)

Lithology: Sandstone

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

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UKJMM Vol.29 p.14


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