The West American Scientist. 
fis county (notably in Jamul valley) 
for the manufacture of cement. Thino- 
ates occuring on the Colorado desert, 
another form 
“Limestone occurs abundantly in var- 
—the most highly 
prized color este the ancients—oc- 
curs on the Colorado desert. 
Ophiolyte, or Verd- ne marble, 
occurs on the Mojave desert, where 
large quarries rh this beautiful and 
ied prized ornamental stone have 
peer rAawetobe 
RAR RI — “Ho rm silver’ 
rgplay # silver), composed of about 
75 cent rented and 24.7 per cent 
45 pounds veel cubic 
cece making a 
nOPy RITE rer es 
eg in large deposits in Baja Califor- 
, and a mine of this oe a now be- 
tae developed near Enc 
Beye arate of copper, 
r oxide, 
the Colorado river, d in wer Cal- 
ifornia. It is sometimes vecsvhan ‘ev for 
turquoise. 
* CINN satire FEY qi pee eave 86.2 per 
ent mercury, 13.8 per cent sulphur, 
pelehin ng 549 pounds per cubic feet per 
ton. This is the principal ore of geass 
fro 
dustry in this county is practically con- 
fined to California, the product in 1896 
being reported worth over one million it 
ITE—Red oxide of copper; red 
RITE — “Footprints of the 
; some beautiful specimens have 
been "collected io the Majave desert, 
by Mr. Ira J. Gra 
,ERYT THRITE_Oceurs at the Kelsey 
fm 
S rather entitled to a separate 
reported from the Colorado 
if 
ae near Compt Los Angeles 
county, Cal., as sapniatea with an ore 
of oa and of cobalt in dark colored © 
earthy masses 
in the fourth report, page 
bo bo ct 
~] 
SAB 
‘There are two localities of erythrite 
in the west which deserve mention. One ~ 
of these, near Lovelock’s, Nevada, has 
ielded considerable quantities of nickel 
and cobalt ore The cobalt bloom oc- 
curs in crusts and aggregations of very 
small crystals inthe seams of a calca. 
reous rock, containing also brilliant brass 
yellow acicular crystals of millerite. The 
ore as mined and shipped contains an 
unusually high ap pty | of both nickel 
an also masses of a 
black earthy aggre mie consisting large~ o% 
ly of black oxide of cobalt. emass- 
es do not appear to 
black oxide of cobalt, for which the 
name asbolite may be retained if the — 
description is amended so as to make 
the re of manganese unessential. : 
. P. Blake, in Am. Jour. Sci. 
t punt leas desert, 
massive form ee 
ALEN NA+ bead sulphide, composed | 
per cent lead, and 13.4 
in a 
desert, carrying a tea or less quant S| 
ty of gold and s aes 
ee to m 
baked, becomes quite ha 
nish ates with half a pint of oil, 
