This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...classes, which are fixed within certain arbitrary limits by the ratios between the salic and the femic minerals. These classes are as follows: sal 7 I. Persalane: Extremely aalic _em'l II. Dosalane: Dominantly salic tem. l f" sal 5 3 III. Salfemane: Equally salic and femic-fem-3' 5 IV. Dofemane: Dominantly ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...classes, which are fixed within certain arbitrary limits by the ratios between the salic and the femic minerals. These classes are as follows: sal 7 I. Persalane: Extremely aalic _em'l II. Dosalane: Dominantly salic tem. l f" sal 5 3 III. Salfemane: Equally salic and femic-fem-3' 5 IV. Dofemane: Dominantly femic Tem'_5'"T eal 1 V. Perfemane: Extremely femic lemT That is, the field between an entirely salic rock and one entirely femic is divided into five parts, each representing a definite range of variation. A rock containing more than seven-eighths of salic minerals to one-eighth femic is in the class persalane; one with less than seven-eighths salic to more than three-eighths femic falls under dosalane, and so on. A granite, for example, containing over 87.5 per cent of quartz and feldspar is placed in Class I; a peridotite with over 87.5 per cent of femic minerals belongs in Class V. Many basalts, gabbros, diorites, etc., contain salic and femic compounds in nearly equal proportions, and are therefore in Class III. From the norm of a rock its class can be determined at once, and in many cases a mere inspection of the analysis is sufficient. The two extreme classes occupy each one-eighth of the field; the other classes divide the remaining six-eighths between them. The division of classes into subclasses is based upon a previous division among the standard minerals themselves. Thus the salic minerals are grouped as quartz, Q; feldspar, F; lenads, or feldspathoids, L; corundum, C, and zircon, Z. Q, F, and L arc placed together as one subclass; C and Z as another. In the femic series we have, first, pyroxenes, P; olivine and akermanite, O: with the group of iron ores and titanium minerals, M; and, second, the accessories apatite, ...
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