MINERALOGICAL NOTKS : NO. III. — ANDKHSON. 



141 



The agreement, especially for the important 0001 A 1011 and 

 0001 A 1121, is by no means close, but a considerable latitude 

 may be claimed on account of the poor quality of material and 

 the small number of observations, which were limited by my 

 desire to mutilate a handsome specimen (PL xxxii.) as little as 

 pDSsible. 



CROCOITE. 



Magnkt Mine, Tasmania. 



(Plate xxxi., fig. 5). 



Of this mineral I have examined five specimens with crystals 

 in situ, four lent by Mr. W. F. Petterd and one by Mr. G. W. 

 Cai^d, also a number of loose crystals belonging to Mr. Petterd. 



The matrix is a rather friable limonite in which the crocoite is 

 partly embedded. The largest specimen carries numerous crystals 

 averaging about 2 mm. in length ; in the other cases where in situ 

 the crystals are quite minute and had previously been referred to 

 carminite (arsenate of lead and iron) by Petterd,'^ who however 

 informed me in forwarding the specimens that he doubted 

 whether this identification was correct. Qualitative analysis 

 proves their cijmposition to be chromate of lead, and, like the 

 larger crystals, they agree morphologically with crocoite. Hence 

 carminite must be deleted from the list of Tasmanian minerals. 

 Of the loose crystals, which are all imperfect, some measure about 

 10 mm. in length. 



The habit is remarkably constant throughout, the crystals being 

 prismatic by extension along the zone axis b t (PI. xxxi., fig. 5). 

 This zone being the only well-developed one was made equatorial 

 and a stereogram constructed from the co-ordinate angles obtained ; 



11 Petterd— Proc, Koy. Soe. Tas., 1902 (1903), p. 20. 



