NOTES ON LAWSONITE. 
By W. T. Schaller and W. F. Hillebrand. 
Crystals of lawsonite are very simple in their combinations, the 
common forms being- the prism, base, and brachydome. Two habits 
occur — tabular crystals with {001} and {110} and crystals with the 
forms {110} and {Oil}. The brachypinacoid and the brachydome {04m 
also occur. A large number of crystals from the typical locality in 
Marin County, CaL, were collected by the writer and carefully exam- 
ined with a hand lens for any additional forms. Only two new forms 
were determined. 
The forms observed on the six crystals measured are: 
e=0 =001 
£ = 0oo =010 
m—cc =110 
^=01=011 
.=01=041 
r= 2 = 221 
s= 3 = 331 
The angles measured, with those calculated for these forms, ar< 
quoted in the table following: 
No. 
Letter. 
sy 
nbol. 
Measured. 
Calculated. 
Gdt. 
Miller. 
</>• 
p- 
«/'• 
p- 
/ 

, 
/ 

1 
c 

001 

02 

00 
2 
h 
Geo 
010 
00 
1)0 
00 
00 
1)0 
00 
3 
m 
GO 
110 
56 22 
90 
00 
50 22 
DO 
00 
4 
d 
01 
011 
01) 
36 
36 
00 
36 
27 
5 
e 
04 
041 
00 
71 
18 
00 
71 
IS 
6 
r 
2 
221 
56 27 
01) 
10 
56 22 
69 
27 
7 
s 
3 
331 
5i; 22 
7(1 
21 
r^ 22 
75 
58 
58 
