4 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
Pucherite has not heretofore been reported from Brazil and, since 
the crystal measured shows one form new to the mineral, the results 
are presented briefly. Crystallized pucherite has previously been 
known only from Europe, although earthy and puiverulent material 
has been found in Arizona and California. 
The present specimen is from a weathered pegmatite vein in Sao 
Jose de Bryauba in the Province of Minas Geraes, Brazil. The speci- 
men consists of a mass of pale yellow earthy bismutite which has a 
faintly woody structure, as though pseudo- 
morphous after some columnar mineral. 
The exterior of the specimen is partly coated 
with the crystalline pucherite, while some 
pucherite is also disseminated through the 
interior of the bismutite mass. The pu- 
cherite is dull dark brownish red in color and 
forms crusts of imperfect, intergrown, and 
somewhat bruised crystals. Only one crys- 
tai was measured, and very few of those 
on the specimen are suitable for measure- 
ment. The crystal measured had the form 
shown in orthographic and clinographic 
projections in Figure 6. The dominant 
planes are, as shown, the base c(001) and 
the pyramid ¢(121), with 2«(021) and 
ie k (122) as smaller faces. The basal pinacoid 
é c(001) gives an excellent signal, which 
Fic. 6._ORTHOGRAPHYC anp cuivo. Serves to orient the crystal in polar position. 
GRapHic prawines or a pucner- The dome 2(021) also gives very good 
ITE CRYSTAL FROM MINASGEBAES, sionals, while the pyramid ¢(121) is wavy 
and striated parallel with its imtersection 
with the base. The pyramid k (122) has not previously been recorded 
for this species. It occurs as relatively narrow faces giving only 
moderately good signals. The measurements on the crystal are 
tabulated below: 
Forms and angles on pucherite from Brazil. 
Measured. Calculated. 
Letter. | Miller. | Symbol. 
re) p ) p 
° / ° / ° 7 ° / 
Cc 001) OW plat ees Ope OO si s:.ce8 Peso 0 00 
c 021) 02 0 00 66 49 0 00 66 49 
e (121) 2, 43 14 72 40 43 11 72 40 
k (122) 41 43 34 58 49 43 11 58 O1 
