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A disrupted chemical sediment of banded galena, sphalerite, strontian barite and calcite encrusted with pyrite. Typical Mississippi Valley-type lead-zinc mineralisation from Hampstead Farm Quarry, Chipping Sodbury, Gloucestershire, UK.
Our collection of more than 15,000 specimens is a valuable resource for the field of economic geology.
Explore our foraminifera, ostracod, conodont, radiolarian and palynology collections.
Petrology curator in the Earth Sciences Department.
David A Smith, curatorMineral and Planetary Sciences DivisionNatural History MuseumCromwell RoadLondonSW7 5BD
+44 (0)20 7942 5163Email