DEc., 1908. MINERALOGICAL NOTES scl 
centimeters, and possess a yellow tinge. They may be described as 
having a wedge-shaped form, this being chiefly produced by the 
development of the prism M (410). 
Another prismatic habit is characterized by a normally developed 
unit prism combined with extended basal and macropinacoids. 
Several pyramids also usually round the edge between the basal plane 
and prism. These crystals are as a rule transparent and colorless 
and rather small in size, their length in the direction of the vertical 
axis being about 4 millimeters, and in the direction of the macro- 
axis, about 7 millimeters. Fig. 1, Pl. XLV (Mus. No. M 9573) illus- 
trates this habit. 
The only remaining habit to be noted is a pyramidal one. Crys- 
tals of this habit are as a rule of simple development and are com- 
posed principally of the pyramid y (122) with minute basal planes and 
macro or brachydomes. One crystal of this type also shows small 
planes of the unit prism. These crystals have average lengths in the 
direction of the vertical axis of from 5s to 1o millimeters. On one 
specimen (Mus. No. M 9569) represented in Fig. 4, Pl. XLVI, the 
crystals have a milk-white color, while those of another specimen 
(Mus. No. M 9576) represented in Fig. 5, Pl. XVLI, are more nearly 
transparent and dark colored. The occurrence of the macrodome 
on one and brachydome on the other is also notable. One speci- 
men (Mus. No. M 9677) exhibits a single large crystal possessing a 
pyramidal habit, but owing to the rounded nature of the planes the 
symbol could not be determined. The crystal is 4.5 centimeters in 
length, partially opaque, and of a dark yellow color. Another habit 
of occasional occurrence is produced by a combination of a pyramid 
and prism in about equal proportions. Crystals of this type (Mus. 
No. M 9581) are illustrated in Fig. 6, Pl. XLVI. They are not asa 
rule doubly terminated, but are so occasionally. Generally they are 
small, about .7 of a centimeter being an average length. These crys- 
tals are also as a rule transparent and colorless. . 
A total list of the forms observed on the Eureka anglesites is as 
~ follows: 
a (100) 0 (230) T° (112) 
Um (O10) n (120) rah i aa 
Ean oot) o (oIr) t (22T) 
m (x10) d (102) p (324) 
M (410) . 1 (104) y (122) 
p (124) 
