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Llandybie (Llandebie), Carmarthenshire, Wales, UKi
Regional Level Types
Llandybie (Llandebie)- not defined -
Carmarthenshire- not defined -

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Latitude & Longitude (WGS84): 51° 49' 1'' North , 4° 0' 23'' West
Latitude & Longitude (decimal): 51.81695,-4.00667
GeoHash:G#: gcjnubfrt
UK National Grid Reference:SN617151
Köppen climate type:Cfb : Temperate oceanic climate
Nearest Settlements:
Llandybie2,813 (2017)0.4km
Ammanford23,709 (2017)3.0km
Tycroes2,156 (2016)4.4km
Glanamman4,168 (2016)5.4km
Cross Hands4,549 (2016)6.2km
Other/historical names associated with this locality:Dyfed

Brammallite, recorded as a new mineral in 1943, is named after Dr Alfred Brammall, formerly of the Department of Geology at Imperial College of Science & Technology, London. Although the type locality is at Llandebie (Llandybie), the exact location is not recorded (but was most likely from the opencast coal mines here. The grid reference given is for the village of Llandebie itself.

At Llandebie, brammallite occurs as compact, white, flaky tufts, reminiscent of satin spar, formed by aggregates of elongated plates about 0.5 mm in length and 0.001 mm across, on shale.

Regions containing this locality

Eurasian PlateTectonic Plate
British IslesGroup of Islands

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

1 valid mineral. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc.

Detailed Mineral List:

Formula: KAl2(AlSi3O10)(OH)2
Reference: DAN Earth Sci. 208 (1973), 157; CM 36 (1998), 905
Paragonite var: Brammallite (FRL)
Type Locality:
Reference: DAN Earth Sci. 208 (1973), 157; CM 36 (1998), 905

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates
var: Brammallite (TL)

List of minerals arranged by Dana 8th Edition classification

Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Unclassified Minerals, Mixtures, etc.
var: Brammallite (FRL)

List of minerals for each chemical element

H MuscoviteKAl2(AlSi3O10)(OH)2
O MuscoviteKAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2

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

Late Carboniferous
298.9 - 323.2 Ma

ID: 3136571
Late Carboniferous claystone

Age: Pennsylvanian (298.9 - 323.2 Ma)

Lithology: Major:{claystone}, Minor{siltstone,sandstone,coal}

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]

307 - 315 Ma

ID: 2036001
Pennine Lower Coal Measures Formation And South Wales Lower Coal Measures Formation (Undifferentiated)

Age: Pennsylvanian (307 - 315 Ma)

Stratigraphic Name: Pennine Lower Coal Measures Formation; South Wales Lower Coal Measures Formation

Lithology: Mudstone, siltstone, sandstone, coal, ironstone and ferricrete

Reference: British Geological Survey. DiGMapGB-625. British Geological Survey ©NERC. [23]

419.2 - 443.8 Ma

ID: 3185808
Paleozoic sedimentary rocks

Age: Silurian (419.2 - 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]

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

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.
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