426 



W. O. HOTCHKISS 



Mineral 



Orthoclase , 



Ottrelite 



Pargasite (common Hornblende) 



Pectolite 



Penninite 



Periclase 



Perowskite 



Phillipsite 



Phlogopite 



Picotite (see Spinel) 



Pleonaste (see Spinel) 



Prismatine 



Prehnite 



Pyrope 



Quartz 



Riebeckite 



Rinkite 



Rosenbuschite 



Rutile 



Sapphirine 



Scapolite (see Wernerite) 



Scolecite 



Serendibite 



Serpentine 



Siderite 



Sillimanite 



Sismondine (see Ottrelite) 



Sodalite 



Spessartite 



Spinels (Red) 



(Blue) 



Spodumene 



Staurolite 



Stilbite 



Talc 



Thomsonite 



Titanite 



Titanolivine 



Topaz (Fl) 



(OH) 



Tourmaline (White) 



(Blue) 



(Chrome) 



Tremolite , 



Tridymite 



Uvarovite ; . . . , 



Vesuvianite 



Indices of Refraction 



■519 



? 



.613 

 ? 



•576 

 •731 

 .741 



•38 



? 



? 

 .562 



.669 

 .616 



.741 

 ■750 



•553 



.687 



.665 



? 



•903 

 .706 



•634 

 .658 



•483 

 .486 

 .810 

 .716 

 .720 

 .651 

 •736 

 •494 

 •539 

 •497 

 .888 

 .669 

 .607 

 .629 

 .620 

 .631 

 .641 



•599 

 .609 



•479 

 .838 

 .701 

 .726 



1.524 

 1. 741 

 1 .620 

 1. 61 

 ^•577 



1-51 

 ^•57 

 1 .606 



1.680 

 1 .626 



■544 

 ? 



.668 



•65 



.616 



.709 



•495 

 .502 



•7 



■54 



.872 



■659 



1 .669 

 1. 741 

 1.498 

 1.589 



1^503 

 1.894 

 1.678 

 1 .610 

 1 .631 

 1.639 



1^653 

 1.687 

 1 .612 

 1 .623 

 ^■477 



i^7o5 

 1732 



1-527 

 ? 



1.632 



? 



? 



? 



1 .606 



? 

 ? 

 ? 



1 .712 



? 

 ? 

 ? 

 ? 



1.678 



1.677 

 1.746 

 1 .500 

 1.589 



^•525 

 1.979 

 1 .702 

 1. 618 

 1.638 



1 .624 

 ^•635 



Maximum 



Bi- 

 refringence 



0.008 

 0.016 

 0.019 

 0.038 

 O.OOI 



0.003 

 0.044 



.013 



■°33 



0.009 

 0.005 

 0.003 

 0.026 

 0.287 

 0.006 



0.008 



weak 

 0.013 

 0.238 

 0.020 



0.026 



O.OIO 



0.006 



0.050 



0.028 

 0.091 



0.033 



O.OII 



0.009 

 0.019 

 0.022 

 0.046 



0.025 



0.026 

 0.002 



0.004 

 0.006 



