— 
Fes. 1900. New MINERAL OCCURRENCES—FARRINGTON. 225 
crystals which occur on a piece of the quartz gangue common at 
the mine. With the caledonite crystals are associated crystallized 
cerrusite, massive galena, linarite, and wulfenite. One of the crys- 
tals of caledonite is of good size, being 5 mm. in length in the 
direction of the vertical axis, and 3 mm. in length in the direction 
of the macrodiagonal axis. The other crystals are smaller. All 
are developed prismatically in the direction of the brachydiagonal 
axis, and are attached by its extremity. The crystals are of a deep 
bluish-green color and transparent. They are penetrated to some 
extent by cerrusite, which shows as darker spots when seen under 
a lens. These portions also turn brown when fragments of the 
mineral are heated in the closed tube. Other pyrognostic charac- 
ters of the mineral, noted by the writer, which may be added to 
those given by Dana, are: Intheclosed tubeit decrepitates, becomes 
black and opaque, and gives off water. Fuses easily B. B. with 
intumescence to a black globule. 
The crystals were fairly well suited for goniometric measure- 
ment, and the following forms were found, the position and letter- 
ing being that given by Dana: 
b (O10) x (201) 5.(223) 
¢ (OOT) J (012) Ne ay 
m (110) e (OIT) 
The development of the different crystals was found to be quite 
constant, the prominent forms being ¢, 4, mands. The most per- 
fect crystal was considerably striated parallel with the direction of the 
brachydomes, also in the direction of the zone of the pyramids and 
prism. Owing to these striations but few really accurate measure- 
ments could be obtained, but a few were secured which are of inter- 
est as supporting the correctness of the ratios obtained by Busz* 
from a study of the caledonite of Leadhills. The following are the 
measurements which it was possible to make with accuracy, and 
for comparison are given the values as calculated by Busz: 
Measured, Calculated. 
ME ICIDO EL BLO) 6. odd si0:s, shoo @ sie ee wie aa ossi eens 475290) 47. 252 30° 
OS 6a en re eee ein we ee 
ALO) es ok 5 ni gue, ooefos ny, d suslananhece 66° 35 66° 30’ 34” 
MT FOOT a disc ck's oo serene ne ww cds a ee. 7 hoe ew 
MEDAL IGT (5 ce odo 4 a vnc draiad. cane mews FAA oy 36° 14’ 
The crystals were carefully studied also in the hope that some 
measurements might be found which would throw some light on the 
*Neues Jahrbuch fur Min. Geol. u. Pal. 1895, Bana I, p. 111. 
