COLUMBATE8, rimsi'll.\Tl<.s, VANADATES 513 



l>. LiiiiMtites of Maine, MS M! Ilrlinm, Paris, and Aul)iini, where it is 

 a ociated with spodumeiie. Irpidolite, Mild 1 ouriiialine ; al-.i in 

 North Carolina, Mini at Pala, San Diego County, California, with 

 the same a nciated minerals. 



( 'hcinically some sodium may replace | he lithium, when the 

 Maine will I.e mixed with yellow. There has been a variety de- 

 scribed in which sodium occurs alone, without lithium, forming a 

 sodium amblygonite. 



OLIVENITE 



Olivenite. Cu 2 (OH)AsO 4 ; Basic copper arsenate; CuO = 

 "i<>.l, As 2 O 5 = 40.7, H 2 O = 3.2; Orthorhombic ; Type, Didigonal 

 Equatorial; a : b : c = .9396 : 1 : .6726 ; 100*110 = 43 13'; 001 A 

 101 = 35 36' ; 001 A 01 1 = 33 55' ; Common forms, a (100), b (010), 

 m (110), e (Oil), v (101) ; -Cleavage, m, b, and e in traces ; Brittle ; 

 Fracture, uneven; H. = 3; G. = 4.1; Color, shades of dark green 

 and brown ; Streak, green or brown ; Luster, vitreous ; Translucent 

 to opaque. 



B.B. Fuses easily, yielding a bluish green flame. On coal 

 yields an arsenical odor, and after roasting and reducing with soda, 

 borax, and coal dust yields metallic copper ; in the closed tube yields 

 water. Soluble in nitric acid. 



General description. Crystals small, acicular, prismatic, or 

 fibrous aggregates with a velvety surface. The brown varieties 

 are known as " wood copper." Olivenite is a secondary mineral 

 deposited in veins or cavities, associated with quartz in the oxidized 

 zone of copper mines. Found in the United States in the Tintic 

 district of Utah. 



LIBETHENITE 



Libethenite. Cu 2 (OH)PO 4 is the phosphate of copper isomor- 

 phous with olivenite, and the two are therefore often crystal li/ed 

 together. It differs from olivenite in that the cold nitrie acid 

 solution yields a yellow precipitate with ammonium molybdate, 

 (P 2 5 ). 



Adamite, Zn 2 (OH)AsO4, is the zinc member of the series; it is 

 associated with Hbethenite in the old zinc mines of Laurium in 

 Greece. 



2L 



