Geology and Mineralogy. 341 
Si0, Fe,0; Al,0;  K,0 ne se sat P,0¢. Pe 50 
2433 0-20 «57-88 0-10 0°60 5°61 2°91=102°76 
loot. O:6or Pana 8-02-9944 
In calculating the formula the Fe,O, and P,O, are neglected as 
due to im mpurity, “dh the water is assumed to be basic since it 
st not go off at 270° C. The atomic ratte? for Si: (Al,): 
Sg Na): (©, F, ‘Cl)= 0°4055 : 0°5674 : 1-2208 : 3°1282 or nearly 
oe. 
‘Oo 
° 
eg 
oO 
hs 
a> ay 
° 
[= ae 
ak 
a | 
ie) 
et 
° 
2 
‘OS 
LD 
je 
% 
o3 
P 
nate 
oO. 
‘Z 
ws 
oo 
fae 
o 
Bo] 
7s 
Cad 
° 
oe 
eo 
= a 
® 
; The zunyite forms the gangue of an uncrystallized sulphide 
r ai and arsenic to which the name Guitermanite, “ Mr. 
ranklin Guiterman, has been given. When fresh it is of a 
bluish-gray color, possesses a slight metallic luster, a ree it 
of about °3 sud. § ge fa gravity of 5°94. Analyses on two 
Portions afforded: 
sn 8 As Pb Cu. Ag Fe Zunyite 
oh fous 13°40 63°60 «017 «002 043 1°77 = 99-06 
2 13°00 «61°63 OO1T) Ss (0028S 382Ss«C 05H = 99°63 
faitoting a little lead sulphate, free oe oe and pyrite there 
remain S 17°68, As 13°00, Pb 59°85, Cu 0°17=90°70, which leads 
to the provisional formula 3As,8,, 10PbS. 
Another article by Dr. Hillebrand describes the coors ence and 
Bee's analyses of several interesting minerals from the erican 
gle Mine, Tintic District, ee viz: ponies: in crystals, also 
sae Piloeearrs 
ftom the S Srobiiones Ming, 1 Red Mou ain, ae aa County, 
Colorado ; melonite trom Boulder County, clot 
10. On Colemanite, the see orate 0 me.—In any December 
minary n otis was given by Profes- 
Sor A. Wendell Jackson of i crystalline form of the new sae 
a lime from Hotes California, called Colemanite by 
va ublished an exhaustive 
f 
n pu 
subject in Bulletin ae 2 of the Celt 
erfection of the 
crystals, and the complexity of their forms. The crystals are 
generally clear and colorless with Lop gat a and vary for 
he most art from 5 or 6 mm. to 30 m paging In 
Some cases they line the cavitie es 0 teard poor n the massive 
mineral, for ming most anande mineralogical crabea Profes- 
Sor Jackson ainents the san | ratio in his monograph as was 
Siven in the notice referred rn viz: 
€:b: ex 0°774843 : 1: 0°540998 : B=69° 50’ 45”. 
