CHARTS FOR CORRELATION OF OPTICAL PROPERTIES WITH CHEMICAL COMPOSITION OF SOME COMMON ROCK-FORMING MINERALS*
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1 CHARTS FOR CORRELATION OF OPTICAL PROPERTIES WITH CHEMICAL COMPOSITION OF SOME COMMON ROCK-FORMING MINERALS* GBoncn C. KBNNnrv, Society of Fellows, Haraard, Unioersity. The following group of charts has been assembled from sources as noted below. The data, though the best now readily available, are in part subject to correction. Persons using these charts are requested to note any errors that come to their attention. The feldspar curves were compiled by F. C. Calkins and modified by Hess in the region of the highly calcic plagioclases. Curves for the high-magnesium end of the orthopyroxene diagram are after curves by H. H. Hess, published in American Mineralogi,st, 25, (1940). Curves for the high-iron end have been constructed by the writer from inferior data and are not of the same reliability as Hess's data. The curve for 2V is from Hess. Curves for the diopside-hedenbergite series and for the diopsidejohannsenite-hedenbergite triangular diagram are after unpublished curves drawn by Waldemar T. Schaller. Curves for clinoenstatite-clinohypersthene-diopside-hedenbergite are taken from a diagram published by Toru Tomita in Jour. Shanghai Sci. Inst., Sec. 2, lr 46 (1934), and modified by the writer in the diopsidehedenbergite range of the system using Schaller's data. The olivine curves are from data obtained on synthetic minerals, by N. L. Bowen and J. F. Schairer, published, in American Journal of Science,29, 197 (1935). The curve for 2V has been calculated from these data by Clyde Wahrhaftig. Curves for the calcite group minerals are after unpublished curves constructed by Clarence S. Ross. Data for the garnet triangular diagrams were compiled by Michael Fleischer and published in American Mineralogist, 22, (1937). Grateful acknowledgment is due the contributors to this compilation. Professors E. S. Larsen, Jr., Clifford Frondel and Cornelius S. Hurlbut have carefully checked the diagrams and made many suggestions in their presentation. x Contribution from the Department of Mineralogy and Petrography, Elarrard University, No
2 562 GEORGE C. KENNEDY NoAlSirOu CoAla5izOo PloL% An.' t.59 t.58 7o" Ref. lnds. t.54 r.53 t.5 2 For oor + oto,reod neg.ongles up from o9 Compifed by F.C.Colkins,,e'4o ond omended by H.H.Hess,rs4r Frc. 1. Variation of optical properties with chemical composition in the plagioclase-f eldspar group.
3 CHARTS CORRELATING OPTICAL PROPERTIES WITH COMPOSITION 563 o" NoAl5i, goorzr to Corlsbod Twins Cr,Alz5az0r' 90 tooyo 5olid curves, eyt. for,l$; broken curves, for tr- Compiled by EC. Colkins.reao ond ornqnded by H.H.Hess,rser too% Frc. 2. Variation of optical properties witl chemical composition in the plagioclase-f eldspar group.
4 564 GEORGE C. KENNEDY Erototite Mgosro. Hyxrsthec Feosiq Frc. 3. Variation of optical properties with chemical composition in the enstatite-hypersthene series.
5 CEARTS\,RRELATING,PTICALPR1PERTIESWITEC}MPjSITI)N565 n 't.78 2V+ 65 t t.75 t, t,7? t.7l t.70 t69 t.68 t.67 t66 Co Mg5i.O" loo CoFeSi20" Hedenberqife Frc. 4. Variation of optical properties wittr chemical composition in ttre diopside-hedenbergite series'
6 566 GEORGE C. KENNEDI' Johonnse nrle Co Mn Si2O5 Frc. 5. Variation of N, with composition of diopside hedenbergite-johannsenite system.
7 CHARTS CORKELATING OPTICAL PROPERTIES WITH COMPOSITION 567 n t.6 r.66 ta4,+l 900 ''-, I,E? ooa t.80 7c, t.7a q ? t.7q r.6e r.66 t.64 l'1ol.% to?o so ao Forsterite Mg,5i Oa Frc. 6. Variation of optical properties with composition in the f orsterite-f ayalite series. 90 loo Foyo lite FejSiOa
8 568 GEORGE C. KENNEDY Diopside Collgsr'ao6 / * :\ Hedenberqife \Co Fe SizO: p,\e4 o' wt-% 1.6 Clinoenstotite MgSi05 6 l I t 7? t, t.75 Clinohyperslhene Fa 5 i.o3 Frc. 7. Variation of Ny and 2V with composition in ttre clinoenstatite-clinohlpersthenediopside-hedenbergite system.
9 CHARTS CORRELATING OPTICAL PROPERTIES WITE COMPOSITION 569 flo t.6? r.86 r.85 r.g4 t.83 ra2 r8l 1.80 t-79 t76 l-77 t.76 t t.73 t.72 t7l t70 t69 r.6e t.67 t,6 Nol.% o ro & Frc. 8. Variation of N. with composition in calcite group minerals.
10 Frc. 9. Variation of physical properties with chemical composition in the garnet group minerals. a. Grossularite, pyrope, almandite. B o <'J?.f Almondite
11 f 6rossutori te Co5Ala SirO', Mol% ' D e ns iir e9 c. Pyrope, grossularite, andradite. 5.srs,11fil"e" // \149!Atr Si!O,r 14 o e 9 e rj6 a 10v 5pessrfife MnrAl.5irO,e lyrorlo Almondife Fe5 Al15iiO,. d. Pyrope, spessartite, almandite.
12 t735 t Gro55ulorile q il^t co!al2 5iro,z "'u,o t78 r80 tgz t84 R e f r o c t, v e I n d I ces e. Spessartite, grossularite, andradite. F '@ a- -o.q -^ Spes$rlite / \Mn5Al25i5Orz i;o,l.".oil%,. ruutz f. Spessartite, andradite, almandite.
13 L3z g. Grossularite, spessartite, almandite. Androdil-e Coa Fea 5i3 Orl fiu:"fr:s',o,. Mor% 3,S 4.oo 4'to Densifies Almondite 'o. Fe5 Al2 5i1O,3 h. Andradite, pyrope' almandite.
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