TITANIUM. 



437 



with effervescence, affording while hot a yellow semi-opaque glass, which, on cooling, 

 changes to a pale green, and becomes clear. When pulverized, treated with sulphuric acid,, 

 luid subjected to heat, it gives out fumes which corrode glass.* 



Composition. Titanium 64.71, iron 7.14, yttrium 0.80, fluorine 27.33, aluminum » 

 trace (Shepard). 



Geological Situation. It has heretofore been found only in white limestone. 



Fig. 530. 



LOCALITY. 



Orange County. The only known locality of this mineral is two and a half miles south- 

 west of the village of Edenville, where it occurs associated with spinelle, serpentine, chon- 

 drodite, mica, etc. In reviewing the measurements of the crystals, they seem to differ con- 

 siderably from those above given by Shepard. M on M' from 102° to 

 105°. One of the secondary forms is represented in Fig. 530, in which 

 the obtuse lateral edges of the primary are truncated, and its acute one 

 bevelled. Its summits are often rounded, and it is quite difficult to 

 measure the inclination of the several planes. 



However much this mineral may resemble hypersthene and bronzite, 



in chemical composition it differs remarkably from both these minerals. 



It is to be regretted that this name has been given to the present 



species, as it had previously been appropriated by Dr. Thomson to an 



entirely different mineral. 



* The preceding description of this mineral is drawn from two papers in regard to it by Prof. C. U. Shepard. Amtrican Jvmt^ 

 wd of Soma, XXXIV. 313; XXXVI. 85. 



