quantity, 
hum, calcium, and natrium,” 
_Teported as occurring in Southern Cal- 
MALACHITE—Green carbonate of 
of about 71.9 r 
r cent car- 
or cuprite are the Colorado 
fo 
CA—The mica of commerce is a 
form of muscovite, but no mine in San 
Diego county has yet become a 
ducer. iotite, lepidolite, 
muscovite. 
MOLYBDENITE—Composed of 60 per 
cent molybdenum and 4 
‘O- 
and 
in 
and of a quality 
manufacture of fine w 
considerable 
Suitable for 
6 
ceurs on the Colorado des- 
. 2 © credited to the limits of 
the city of San Diego, but only the in- 
has been d 
_ ed as occurring in Beaver valley, Utah, 
some three miles from Granite Peak. 
lite. 
| See hyalite 
PECTOLITE—“A silicate of alumi- 
Has been 
: 
- ifornia. : 
_ PERIDOT—New Mexico. 
The West American Scientist. 
and Mojave deserts, and in Baja Cali-~ 
rnia. 
* 
24 
PLATINUM—This metal is found on- 
iti imes al- 
the largest 
e. 
an Ysidro, Baja Cali- 
fornia, associated with calcite. 
QUARTZ—A cubic f 
S number of varie- 
See agate, carnelian, chaleedony, 
jasper, etc. 
Rose quartz in magnificent masses 
has been found by the writer near 
Mesa Grande. 
radiations 
urma- 
found i county. The 
crystals measure two inches in 
ameter. 
RUBY: 
The so-called rubies of the placers of 
Baja California are not true rubies but 
only garnets, and seldom of value as 
ms, 
Pi) 
(4) 
True rubies occur in N. ©. and S.-€, 
RUTILE—This rare mineral was dis- 
covered by the writer at Mesa Grande 
SALT—See halite, 
SCHORL—Black tourmaline; quite 
common in San Diego county and in 
Baja California, disseminated ‘through 
