S(_'H ATjLER.] 



Minerals from Lcona Heights. 



1!).") 



COPPER. 



Native copper occurs very sparingly in a shaft sunk sonic 

 distance above the Alma Mine, as small arborescent groups con- 

 sisting of irregularly grouped, distorted crystals, possibly octa- 

 hedrons. 



MELANTERITE. 



General Description . — The ferrous sulphate, melanterite, 

 occurs rather widely distributed as an efflorescence, but only in 

 small quantities. In the mine it occurs as small prismatic crys- 

 tals, up to 2 mm. in size. A pale green mineral, probably 

 melanterite, occurs with a deposit of copiapite near the mine. 



CrystallograpMc Characters. — One specimen of loose crystals 

 of various minerals, collected in the mine, shows a few minute 

 well-formed crystals of melanterite, elongated in the direction of 

 the vertical axis and giving an extinction angle, with the direc- 

 tion of elongation, of about 20? The crystals measured average 

 in size about '2 mm. in length and \ mm. in thickness. Some 

 of the crystals are well developed, the faces, especially the 

 prism (110 1 ami the base (001^, giving perfect reflections. 



Fifteen forms, besides a few vicinal ones, were observed on 

 the nine crystals measured. Of these seven are new. These 

 forms are quoted below in two columns, those in the second 

 column being the new forms: 



Letter. 



Symb 



ot. 



Letter. 



Symbol. 





Grdt. 



Miller. 





Gelt 



Miller 



C 







001 



/ 



oo2 



120 



h 



Ooo 



oio 



d 



+}0 



102 



III 



00 



110 





+10 



203 



W 



+*o 



103 



.)• 



+ S0 



302 



V 



+ 10 



101 



q 



+20 



201 







01 



on 



j 



+«0 



904 



r 



+1 



111 



B 



+1 



332 



V 



—12 



12] 









The measured and calculated angles are given in the table 

 below for the forms observed on these crystals. 



