By W. G. Ernst
This sequence of monographs represents continuation on a global foundation of the former sequence MINERALOGIE UNO PETROGRAPHIE IN EINZELOARSTELLUNGEN, released by means of Springer-Verlag. The voluminous effects coming up from fresh growth in natural and utilized re seek raise the necessity for authoritative studies however the average medical journals are not able to supply the distance for them. via their very nature, text-books are not able to think about particular subject matters intensive and up to date study met'hods and effects usually obtain merely cursory deal with ment. complicated reference volumes are typically too designated with the exception of specialists within the box. it's always very dear to buy a symposium quantity or an "Advances in . . . " quantity for the sake of a selected overview bankruptcy surrounded through unrelated chapters. we are hoping that this monograph sequence will by-pass those difficulties in pleasurable the necessity. the aim of the sequence is to submit, at moderate costs, reports and stories of care totally chosen themes written via conscientiously chosen authors, who're either reliable writers and specialists of their clinical box. commonly, the mono graphs should be thinking about the latest learn equipment and effects. The editors wish that the monographs will serve a number of services, performing as supplementations to latest text-books, guiding examine staff, and supplying the root for complex seminars. August 1967 W. VON ENGELHARDT, Tiibingen T. HAHN, Aachen R. Roy, college Park, Pa. J. W. WINCHESTER, Ann Arbor, Mich. P. J. WYLLIE, Chicago, Ill.
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Extra resources for Amphiboles: Crystal Chemistry Phase Relations and Occurrence
1966)_ + + 26 Amphiboles variable chemical compositions: (Na,K)o_1(Na,Ca,Mn+2,Mg,Fe+ 2)2(Mg, Fe+ 2,Fe+ 3,Mn+ 2,Ti,Al)5(Si,AI,Fe+ 3)s022(OH,O,F)2' We refer to intermediate members of the tremolite-ferrotremolite series as actinolites, to complex Na-AI calcic amphiboles collectively as hornblendes. Because of their chemical complexity most hornblendes cannot be expressed graphically in the familiar two or three component composition diagrams. Not only do the number of components exceed three, but the substitution of some ions can take place in dissimilar structural sites giving rise to different properties.
At somewhat higher oxidation states with foz defined by magnetite quartz - fayalite buffer (Fig. 29), magnetite joins the high temperature assemblage. For the experimental conditions investigated, the clinopyroxene apparently represents solid solution between CaFeSi206 and FeSi03 in the range Hd85_95Fs15_o5. More recent work by LINDSLEY (1967) indicates that the extent of calcic pyroxene solid solution towards FeSi03-rich compositions may be less than estimated above. P-T coordinates for ferrotremoli te dehydration curves illustrated in Figs.
Experimental Techniques Starting materials for most laboratory studies have consisted of stoichiometric proportions of the oxides equivalent to the amphibole bulk composition. A small excess of water is added to the charge to insure complete H 20 saturation of the resultant synthetic assemblage, as reflected by the presence of an aqueous fluid phase. Other techniques involve the preparation of gels, glass or oxalate mixtures of the correct bulk composition C excess H 2 0±C0 2). In any case, such starting materials are chosen for experimental investigations because of their great reactivity Another approach involves (1) the crystallization of the initial oxides to a mixture of relatively less reactive synthetic stable and metastable phases or (2) intimately mixing pure, analyzed natural minerals of both stable and metastable associations; either of these mixtures of phases is then employed as the charge.
Amphiboles: Crystal Chemistry Phase Relations and Occurrence by W. G. Ernst