The Mineralization of the Llanrwst Orefield, North Wales

Randolph Haggerty

The Llanrwst orefield comprises lead-zinc veins hosted in Ordovician volcano-sedimentary rocks, and shares many features in common with other British pre-Carboniferous vein deposits. This study investigates the style of mineralization, mineralogy and geochemistry of the orefield.

Parys Mountain
The Type locality for anglesite

Malcolm Southwood
Richard Bevins

In the late eighteenth century, numerous fine specimens of anglesite were collected from the copper mines at Parys Mountain. It was from this material that Beudant characterised the species in 1832.

The Great Opencast or Parys Mine, looking east.

Mineral Notes

Erionite from Edinbane, Isle of Skye, Scotland
Ken D. Savage

Bismutite from Penberthy Croft Mine, St. Hilary, Cornwall
Steve Rust

Correction: Powellite from Coire Buidhe, Argyll
Roy Starkey

Cabonate-Cyanootrichite from Wedding Cave Mine, Bwlchgwyn, Clwyd
David I. Green

Laurionite from Nantycagl Mine, Ceulanymaesmawr, Dyfed, Wales
Steve A. Rust

Supergene minerals including exceptional ramsbeckite from Penrhiw Mine, Ystumtuen, Dyfed.

John S. Mason
David I. Green

Fieldwork at this recently discovered locality has revealed an unusual suite of secondary Cu-Zn-Pb minerals, including abundant crystalline ramsbeckite, schulenbergite and posnjakite. Excavations were made in undisturbed dump material allowing the secondary paragenesis to be thoroughly investigated.

Radiating prismatic linarite crystals to 2 mm in length. John Mason specimen (JMPR 553).

Crystallized Enargite from the Gregory Mine, Ashover, Derbyshire

Mick Cooper

Enargite is reported from Gregory Mine, Ashover, Derbyshire, on specimens preserved at Chatsworth House. This is the first record of enargite from the Derbyshire Orefield, and the first record of crystals of enargite from Britain.

Supergene minerals from Waterbank Mine, Ecton, Staffordshire.

Steve A. Rust

Waterbank mine on Ecton Hill has produced a diverse suite of supergene minerals including the rare species namuwite, posnjakite, ramsbeckite and schulenbergite

Dark blue linarite crystals to 1.5 mm. Steve Rust collection.

Book Reviews

The Complete Book of Micromounting
by Quintin Wight (1993)
Mick Cooper

Mines of the Gwydyr Forest. Part 5. Coed Mawr Pool, Cyffty and Other Mines
by John Bennett and Robert W. Vernon
Damian J. McCurdy

Minerals, an illustrated exploration of the dynamic world of minerals and their properties
by George W. Robinson
Mick Cooper

Tresor du Museum, Cristaux Precieux, Gemmes et Objets d'Art by Henri-Jean Schubnel and Pierre-Jacques Chiappero
Mick Cooper

Zeolites of Victoria
edited by W.D Birch (1989)
David I.Green

Bocamina Magazine of mineralogy and mineral deposits of Spain. Issue 0: (1994)
Peter Briscoe