Abstract The margarosanite group (now officially confirmed by IMA-CNMNC) consists of triclinic Ca-(Ba, Pb) cyclosilicates with three-membered [Si 3 O 9 ] 6– rings (3R), the general formula AB 2 Si , where A = Pb, Ba and Ca B Ca. closest-packed arrangement atoms parallel to (101) hosts cations in interstitial sites alternating layers. 3R layer has three independent each ring. Divalent occupy sit...

Abstract Barium melilite – bennesherite, Ba 2 Fe 2+ Si O 7 , known only from pyrometamorphic rocks of the Hatrurim Complex in Israel, has been recognised a carbonate–silicate xenolith Bellerberg volcano area Germany. The empirical formula German specimen is as follows: (Ba 1.32 Ca 0.43 Sr 0.23 Na 0.05 K 0.02 ) Σ2.05 (Fe 0.79 Ti 0.06 Mg Al 0.04 Mn 0.03 Zn 0.01 Σ0.98 1.97 . Raman spectrum bennesh...

Abstract. Ferri-taramite (IMA CNMNC 2021-046), ideally ANaB(CaNa)C(Mg3Fe23+)(Si6Al2)O22W(OH)2, occurs in skarn from the Jakobsberg manganese mine, Värmland, Sweden. Associated minerals are celsian, phlogopite, aegirine-augite, andradite, hancockite, melanotekite, microcline (var. hyalophane), calcite, baryte, prehnite, macedonite and oxyplumboroméite. Conditions of formation, close to peak meta...

E. H. Ackerknecht, arguing that a history of therapeutics would be "the most useful book a medical historian could write", apologized in the preface to his own work on the subject (1970; English translation, Therapeutics from the primitives to the twentieth century, London, Collier Macmillan, 1973) that, owing to ill health, he had to limit himself to an outline of therapeutic principles in int...