Abstract
The formula 2PbS. Sb2S3, given for jamesonite in all the textbooks, does not belong to jamesonite at all, but to the ‘Federerz’ (‘feather-ore’) from Wolfsherg in the Harz analysed by H. Rose in 1829, and for which the mineralogical names wolfsberglte (Huot, 1841) and plumosite (Haidinger, 1845) have been proposed. Rose's formula for the cleavable jamesonite from Cornwall was 3PbS. 2Sb2S3. In 1860 Rammelsberg united these, together with heteromorphite, under the name jamesonite and with the formula 2PbS. Sb2S3 a : this has since been followed in the textbooks, but, as will be pointed out below, it is very probable that there are here three distinct mineral species.
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