252 



We oltlained ii iniinber of very pure lanzites, and some good 

 spodainenes: 



1. An iiliuost colourless, somewhat lilac tinged, strojigly dicliroïtic 

 kunzlte from lllncuii in California. 



2. A completel}' transparent, glass3% pale rose tinged kunzite from 

 Sfihatani/-x alley on Madagascar. 



3. A beautiful, transparent pale greenish yellow kunzite from 

 Minas Gtraës in Bra.'id. 



4. A transparent, emerald-green hiddenite from Alexander Countij in 

 jVorih Carolina, U.S.A., and a pale yellow hiddenite of the same place. 



5. A crj'ptocrystalline, opaque piece of .spodamene from Somerii, 

 in Finland. 



6 An aggregation of opaque, long prisms of spodamene from 

 }faine, U. S. A. 



All meltingpoints of the tinely ground material were determined 

 in exactly the same way and with the same care, as formerly 

 described. The specific gravities were detci-mined by means of a 

 pycnometer, with ortho-chlorotoluene as an immersion-liquid ; the 

 specitic gravity of this was: c/40 = J ,0841 at 25°,1 C. 



Most of the optical data were obtained by microscopical investi- 

 gation ; the values of the refractive indices are determined at 16° 

 or 17°C. 



1. Kunzite of Rincon, California. 



Big, very feeble lilac colours, very lustrous and perfectly trans- 

 parent crystals, evidently with a cleavage parallel to the vertical prism. 

 An analysis of Davis, made with the same material, gave the 

 following results : 



Impurities : 

 CaO '. 0,8 7„ MnO -. 0,1V I, 

 Na,0: 0,3 % mo : 0,06 V„ 

 ZnO : 0,447„ K,0 : 0,06 7, 

 Total: 0.78 7„. 

 The crystals show^ a strong fluorescence under the influence of 

 llöNïGEN-rays. 



The meltingpoint determinations gave, with thermoelement IV, the 

 following results: as a mean value of a greater number of obser- 

 vations, we found : 14683 M. V. ± 4 M. V.; as the correction of the 

 thermoelement at this temperature was — 8 M.V., the melting-point 

 is thus : 1428° C. (G. Th.). It is very sharply localised on the 

 heating-curves. 



