198 



University of California. 



I Vol. 3. 



A calculation of the seven new forms to correspond to Gold- 

 sehniidt's Winkeltabellen is given in the following table, based 

 on the elements derived by Zepharovich: 



,2 

 a 



& 



Letter. 



§ 



Miller. 



9 



P 



t 



So 



Vo 



t 



V 



x' 



(Prism) 



(x ■ V) 



y' 



d' 

 = tsp 



1 



1 



oo2 



120 



23° 34' 



90° 00' 



90°00' 



90° 00' 



23° 34' 



66° 26' 



0.4303 





QO 



GO 



2 



d 



-HO 



102 



90 00 



42 50 



42 50 



00 



42 50 



00 



0.9271 









0.9271 



3 



1c 



+£0 203 





49 02 



49 02 





49 02 



( I 



1.1515 







1.1515 



4 



X 



+ }0 



302 



t ( 



66 15 



66 15 





66 15 



1 1 



2.2732 





t ( 



2.2732 



5 



a 



+20 



201 





71 22 



71 22 





71 22 



i t 



2.9666 





1 1 



2.9666 



6 



j 



+|0 



DH4 



i i 



73 03- 



73 03- 





73 03- 



1 1 



3.2828 







3.2828 



7 



B 



+1 



332 



44 29- 



72 52 



66 15 



66 38 



42 02- 



42 58- 



2.2732 







3141 



3.2438 



Physical Properties. — The determination of the optical 

 properties gave results agreeing with those already determined. 

 A cleavage piece (parallel to the base) showed, with convergent 

 light, a biaxial interference figure, with a large angle. The 

 trace of the axial plane was parallel to the trace of the clinopina- 

 coid. Tests with the quartz wedge showed that this section was 

 normal to an axis of maximum elasticity, that is, it gave a nega- 

 tive sign. As, however, the obtuse bisectrix emerges on the 

 base, the mineral is positive with Bx a = C, nearly parallel to the 

 clino-axis. 



The cleavage is basal, perfect. The mineral is colorless to 

 very pale green. In its pyrognostic characters, it agrees well 

 with those already ascribed to melanterite. 



Chemical Properties. — Only a very small quantity of material 

 could be collected for an analysis, which, in consequence, is only 

 approximate and serves but to identify the mineral. It is worth 

 noting that no magnesia could be detected. The analysis gave: 



Analysis. Cale. for Melanterite. 



FeO 28.1 25.9 



S0 3 31.2 28.8 



H 2 42.0 45.3 

 CuO 1 



MgO } none 



101.3 



100.0 



