Ah bluestones
The most famous bluestones in Britain and perhaps the world are the spotted
dolerites at Stonehenge transported by glaciers to Salisbury Plain and
wacked up into the monument . I have a gloss on them
http://rosiehardman.com/stonehenge.htm.
Other bluestones include the unexploitable fine-grained lead-zinc-minor
silver-gold ores found at Parys Mtn Wales and used as road metal.
cheers
Rob
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