212 E. 8. Breidenbaugh—Minerals found at 
Al, O% being considered as replacing SiO,, the oxygen ratio 
for R, Si is 14°83: 3071. : 
Chondrodite—Of the mineral species found at this locality 
e r ndance, smal ains being widely and 
generally disseminated through the ore, forming what the 
miners > But, approaching seams in the ore 
bed, the proportion of chondrodite increases, until, in the seams, 
fissures or cavities, chondrodite occurs crystalline with rounded 
by transmitted light a red tinge; the powder is light gray, and it 
éldom shows marks of decomposition. Disseminated through 
the piece which was analyzed were some small but very per 
fect crystals of actinolite, showing under the microscope sharply 
defined angles. Sp. gr. 3:2. 
Red Chondrodite-—The second variety is cinnamon-red by 
reflected light ; transmitted light gives it a yellow tinge. The 
powder is reddish-gray. This is the prevailing color of the 
crystals and crystalline specimens which were examined. _ 
Grayish-brown Chondrodite.—The third variety has a grayish- 
brown color, shading into a honey-yellow, which is the prevail- 
ing color of the grains disseminated through the ore. It was 
found impossible to separate from the magnetite enough for an 
analysis, but it was proved to be chondrodite by its pyrognosti¢ 
characters. This variety may be merely an altered form of the 
red variety. Analysis of the brown variety gave— 
: I. Il. Mean. Oxygen. 
SiO, 35°21 35°64 35°42 18°86 
FeO 5°73 5°71 5°72 117 
MgO 54°23 54°21 54:22 21°49 
Fl ee ee 9°00 ---- 
: 1 
Equivalent of oxygen replaced by fluorine, 3°79 
100 
