Twll Maen Grisial, Fron Olau, Prenteg, Gwynedd (Caernarvonshire), Wales, UK

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Brookite from this location was originally referred to as being from "near Snowdon" by Sowerby (1809), but this was later confirmed by Sowerby (1838) to be Prenteg. Also incorrectly called "Fonolen" by Greg and Lettsom (1858) and elsewhere described as "8 miles from Snowdon, between Beddgelert and Tremadoc".

Ref.:
- Starkey, R.E. and Robinson, G.W. (1992). "Famous mineral localities: Prenteg, Tremadog, Gwynedd, Wales." Mineralogical Record, 23(4), 391-399.

UK OS Grid Reference: SH582410
Map Reference: 52°56'50"N , 4°6'38"W

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Mineral List:

Albite
Anatase
Apatite-(CaF)
Brookite (TL)
Calcite
Chamosite

Endellite
Galena
Goethite
Halloysite
Ilmenite
Monazite-(Ce)

Pyrite
Quartz
Rutile
Titanite

16 entries listed. 14 valid minerals. 1 type locality (valid mineral).

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