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Verlag, Basel, 1973 ISBN 3-85977-002-0 Peter Rothe Die Geologie Deutschlands Primus Verlag, 2005 ISBN 3-89678-526-5 Johannes Schwanz, Thomas Schüpbach, André Gorsatt Das Binntal und seine Mineralien Verlag: André Gorsatt, 1994 ISBN 3-9520657-0-6 Arthur E.
These micas vary in chemical composition but are all sheet silicate minerals with very similar physical properties.
A generalized chemical composition for the biotite group is: The name "biotite" is used in the field and in entry-level geology courses because these minerals generally cannot be distinguished without optical, chemical, or x-ray analysis.
The West African Craton is primarily composed of two shields, the Reguibat Shield in the north of Mauritania and the Leo Shield in Liberia and Sierra Leone, separated by the sedimentary (Upper Proterozoic to Palaeozoic) Taoudeni Basin.
The Reguibat Shield dominates the northern third of the country's surface geology.
The continental to shallow marine Taoudeni Basin does not exceed 5000 m in thickness, and though it varies somewhat, comprises a remarkably homogenous lithological sequence.