On the Occurrence of Alstonite and Ullmannite (A Species New to Britain) in a Barytes-Witherite Vein at the New Brancepeth Colliery Near Durham

L. J. Spencer
Assistant in the Mineral Department of the British Museum

Mineralogical Magazine; March 1910 v. 15; no. 71; p. 302-311; DOI: 10.1180/minmag.1910.015.71.07
© 1910, The Mineralogical Society
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