Pike Lane Opencut
Winster Moor, Derbyshire
Steve Uttley
In recent years, there have been few sites in Derbyshire which have yielded
supergene mineral specimens. A small-scale working on Winster Moor, has
however, during the last year provided some interesting material, the
author having found good specimens of hemimorphite, cerussite and pyromorphite
at this site.

Colour in Scottish Agates
Robin Field
This article offers some current ideas on the formation of agates and
discusses the problem of the origins of their colour. The distribution
of colour in agates in some of the main collecting area is outlined, and
some of the many gaps in our knowledge of this and other aspects of agate
genesis and occurrence are highlighted, with the hope that others may
feel stimulated to discover new sites and formulate new ideas about this
most fascinating of gemstones.

Bwlchglas Mine, Dyfed, Wales
Simon J. S. Hughes
Blwchglas Mine, although of little economic consequence, has come to
the notice of mineralogists through the quality of pyromorphite specimens
collected there in the late 1970s and early 1980's. This article gives
a historical perspective on the mine from the early workings in the seventeenth
century to its closure in 1923.

Alpine Quartz
Laurent Gautron
The European Alps have furnished many superb mineral specimens, including
some of the finest quartz in existence. The search for quartz from the
Alpine clefts, both for mineral specimens, and carving, stretches centuries
into history. The wide variety of crystallographic habits and morphologies
is a reflection of the different geological environments in which crystallisation
has occurred.

Muirshiel Mine
Central Scottland
J. Gordon Todd
David W. A. Laurence
Muirshiel Mine is a disused baryte mine situated approximately
six miles north-west of the village of Lochwinnoch in the county of
Renfrewshire, Strathclyde, Scotland. The area of the mine offers much
of interest the geologist because of the diversity of the igneous rock
types. Good specimens of stronitianite displaying a variety of crystal
forms, have been found on the dumps.

The Copper Trials of Great Sled Dale,
North Yorkshire
Peter J. Briscoe
David I. Green
Several little documented copper trials, remotely situated
in Great Sled Dale, North Yorkshire, are described. The localities are
atypical of the Northern Pennine Orefield in that lead minerals are
absent. Azurite and malchite are common, presumably as a result of the
oxidation of chalcopyrite; fluorite is the principal gangue mineral.

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