isai.] «^t)7 [Genth and Vom Rath. 



Endlicldle, or Vuaadlum-Mlmeiiie, a new species. 



In the collection of Mr. Clarence S. Benient was a specimen, labeled 

 vanadinite, wiiicU showed such a peculiar appearance that its examination 

 ■was desirable, for which purpose he has kindly loaned the same. 



There are apparently three kinds of crystals present ; some of an orange- 

 yellow and orange-red color, probably vanadinite ; the largest a little over 

 jmm Jq gj2jj . tiiey are hexagonal prisms with pyramid and, slightly devel- 

 oped, a second more acute pyramid ; both the prismatic and the pyramidal 

 planes are strongly striated through oscillation of the pyramidal planes 

 with the prismatic; then there are one or two bright yellow very minute 

 crystals, which are imperfect and appear as, if made up of several indi- 

 viduals ; the planes are the same as those of the orange crystals. The 

 third mineral is developed in the form of very bright straw-yellow crys- 

 tals, showing the strong striation of the prismatic planes and the two 

 pyramids. On the largest crystals, not over 1™™ in length, the basal 

 plane is visible, on the small ones it is quite obliterated. A few of the 

 crystals were hollow. 



An imperfect qualitative analysis gave no satifactory results on account 

 of the exceedingly minute quantity at disposal. Fortunately Mr. Muhlen- 

 berg succeeded in securing for examination another small specimen which 

 showed some peculiarities, but was evidently the same as Mr. Bement's 

 specimen. Implanted in drusy quartz colored by ferric and manganic 

 oxides, the crystals are yellowish- white or pale straw-yellow, the largest 

 3°"° long and from 0.5 to 1.5°"" thick, the forms are those given above. 

 Some of the crystals show only a hollow prism, either empty, or filled 

 with a crystalline powder which now and then assumes hexagonal forms. 

 As the specimen contained only a very minute quantity which could not 

 be picked out, an analysis was made from all the fragments of quartz 

 which showed some of this mineral. On dissolving in dilute nitric acid a 

 slight evolution of carbonic dioxide was observed. 



0.9518 grms gave : 0.7376 grm insoluble quartz, etc., 0.0094 grm FcjOg, 

 0.0029 grm CaO, 0.0127 grm Ag = 0.00417 grm CI, 0.0277 grm Mg,A.s,07, 

 0.0152 grm V2O5, and an unweighable trace of Mg^P^O,. This gives : 



100.00 



