MUSEUM BULLETIN NO. 27. 
38 
Crystal Forms of Diopside from Montreal Chrome Pit 
Letter 
c 
b 
Symbol 
Occurs on all 
crystals. 
Occurs on most 
crystals 
Rare; times 
observed 
Remarks 
001 
010 
x 
X 
Rare on tabular 
crystals. 
Usually very 
small. 
a 
X 
f 
g 
m 
i 
ft 
100 
510 
310 
210 
110 
130 
140 
x 
X 
X 
X 
X 
Always narrow. 
2 Very narrow. 
Always narrow. 
1 Perfect face on 
crystal of flat 
habit. 
e 
z 
F 
I 
M 
* 
P 
n 
Oil 
021 
301 
702 
401 
501 
101 
102 
x 
1 
1 
1 
1 
3 
1 
2 
See Figure 6, 
Very small, see 
Figure 13. 
Ill 
Til 
x 
x 
X 
X 
W 
221 
331 
441 
P 
T 
k 
332 
112 
312 
L 
121 
131 
552 
x 
x 
X 
X 
Rare on tabular 
crystals. 
2 
Several 
See Figures 7 
and 8. 
See Figure 11. 
Several See Figures 7, 8, 
9. 
Several 
1 
1 
Xi 
610 
Di 
13-0-4 
Ji 
902 
U 
701 
Y 
423 
r. 
15-4-10 
s. 
534 
Xi 
773 
<*1 
8-11*4. 
Nt 
1.9.1 
Oi 
10-13-3 
New Forms. 
3 
Several 
1 
1 
3 
Several 
Several 
1 
1 
1 
1 
See Figures 
and 8. 
See Figure 6. 
See Figure 6. 
7 
New Forms. The crystals are very perfect and the faces, including 
the basal plane, are unusually bright and yield single-image reflections. 
The averages of the measured angles agree exactly, or to within a few 
