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Tim I have passed your email on to some people who I thought could help and here is the first reply: "There could well be secondary deposits of calcite in coal measures rocks, the result of fracturing, same as in any rock. I would suggest you contact the National Museum of Wales, they are good on coal, just try their geology department. Alternatively try Roger Vaughan, Geology Conservator, Bristol's City Museum & Art Gallery, Queens Road, Bristol, BS8 1RL Tel: 0117 9223592 "Coal Balls are a particular phenomenon and later deposits of calcite and other minerals are associated with them, the only reference I have is a very old paper, 1961, about coal balls in Illinois! The ball is an aggregate of plant matter which is later replaced by minerals. But there must be more. Quick look on Google gives much the same info. So if there are Coal Balls in the local coal seams there could be calcite and dolomite, lot of dolomite around in the overylying Trias, plenty of calcite in the limestones. "A bit of trawling found well documented Coal Balls in Todmorden, W Yorkshire, but they seem to be rather rare in the UK. More common in the USA, but it is quite likely that no-one has ever looked out for them. Would be nice to know. "Good stuff! I also have another contact about Coal Balls and minerals, getting interested in them now. Sandi " I have also passed your email on to someone else who hasn't replied yet, but will send on when I get a reply. Cheers Roger Gosling SGMRG Treasurer and Collections Manager ----- Original Message ----- From: "Tim Young" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, February 08, 2010 8:46 AM Subject: [mining-history] Bristol Coalfield and calcite/dolomite > Do any listmembers involved with the Bristol area, happen to know if there are any coal > seams in the area with noteworthy contents of calcite or dolmite? - as small coal-balls for > instance? I'm examining some clinkers from the area which apparently had concentrations of > (probably) dolomite which seem a little odd to me... > > Thanks! > > Tim > > > -- > Dr Tim Young > Email: [log in to unmask] > Web: www.geoarch.co.uk > Phone: 029 20881431 > Mobile: 07802 413704 > Fax: 08700 547366 >