Vol. 4] Murgoci. — Classification of the Amphiboles. 



379 



KARINTHINE AMPHIBOLES; COMMON HORNBLENDES. 



Karinthine, pargasite. — Karinthine is the name given by Wer- 

 ner to the dark hornblende from the eclogites of Sanalpe in 

 Karnten or-Carinthia (Hintze, p. 1201). Many mineralogists 

 (Tschermak, Naumann, Lacroix, Dana, Rosenbuseh, and others 

 have included this material among the common hornblendes. E. 

 Weinschenk, in Gesteinshildende Mineralien, has brought it to 

 notice as a member intermediate between the common green horn- 

 blende and blue glaucophane or gastaldite. I use the name in 

 the same sense for bluish green or blue-black amphiboles which 

 under the microscope show a bluish green color parallel to the 

 length of the prism. I believe that Barrois was the first to iden- 

 tify this amphibole from the glaucophane schists with karinthine. 

 The Calif ornian bluish green karinthine is identical with the 

 Alpine karinthine (Val d'Aosta, Zermatt, and elsewhere) which 

 I was able to examine (slides in the possession of Dr. C. Palache), 

 and with those from Val Canaria, Val Pioia, Mt. Taunus, etc. 

 (Rosenbuseh). It is certain that this kind of hornblende has 

 sometimes been described as glaucophane, and perhaps the deter- 

 minations of glaucophane with C = ultramarine or bluish brown, 

 I) = bluish green or lavender blue, and with a large angle of 

 extinction, refer to karinthine, which occurs in almost all glau- 

 cophane schists. Lacroix* has distinguished betwen these am- 

 phiboles and glaucophane; they are namely "glaucophane pas- 

 sant a la hornblende, ' ' or members ' ' intermediaires entre la glau- 

 cophane normale et les amphiboles depourvues d'alcalis. " Ros- 

 enbuseh,! who states that between glaucophane, or rather gastal- 

 dite, and common hornblende or aetinolite there is a series of 

 intermediate forms, suggests that Weidmann's hudsonite may be 

 such an intermediate form (see Table III). I may add that the 

 chemical composition of hudsonite hardly differs from that of 

 hastingsite and of barkevikite, especially of Montana, Beverley, 

 etc., which minerals together with noralite seem to be both chemi- 

 cally and optically members intermediate between common horn- 

 blendite (soretite) and arfvedsonite.t (See Tables II and III.) 



* A. Lacroix, Mineralogie de la France, 1903. 



t H. Bosenbusch, Microseopische Physiographie, I. 2, 1905, p. 240. 



t The glaucophanes (or glaucophane-like amphiboles) described by 

 Szadecky, Washington, etc., as occurring in many igneous rocks enter per- 

 haps into the same category of amphiboles. 



