Genth.] 116 {[Aug. 17, 
with a very faint purplish hue; frequently tarnished with purplish, blue 
and green colors. 
B. B. in a tube slightly decrepitates, fuses and yields an abundant 
sublimate of metallic mercury, also drops of tellurous oxide and, next to 
the assay, metallic tellurium. On charcoal it gives a greenish flame and 
white sublimate. Solubleinnitricacid. Veryrare. At the Keystone and 
Mountain Lion Mines, associated with native tellurium and quartz ; at the 
Smuggler Mine it is often mixed with native gold, resulting from syl- 
vanite, more or less completely decomposed, native tellurium and tellu- 
rite. It is probable that the admixture of sylvanite produces its colum- 
nar structure. 
I have endeavored by mechanical means to separate, as much as pos- 
sible, the pure coloradoite from the associated minerals, but was not 
successful. 
The best selected fragments from the Smuggler were first digested for 
some time with ammonic hydrate to remove the tellurite; the remain- 
ing impurities are gold, sylvanite and quartz. 
The analyses of the heaviest portions from the Keystone Mine, which 
have been obtained by levigation, show a higher percentage of mercury, 
the lighter a larger admixture of tellurium. The results leave no doubt 
that the pure coloradoite has the composition: Hg Te, corresponding 
with that of Cinnabar and Tiemannite, and containing : 
He = _ 60.98 
Te = 39.02 
The specimens from the Keystone Mine, after deducting quartz and 
gold, gave the following results : 
It Me lil. IV. Wi 
Quartz and Gold = [28.50] — [46.83] — [25.18] — [8.46] — [20.72] 
Hg = 56.33 — 52.28 — 51.48 — 49.80 — 45.63 
Te = 43.81 — 42.95 — 44.25 — 46.74 — 50.05 
Al,0,, Fe,O; == 2 AL } 
V0, —= 0.70 | 
MgO == Uh Ces a —— amen! | not determined. 
CaO = Obed eae 
K,O, Na,O 
100.14 99.32 
SMUGGLER MINE. 
War WANl 
Quartz = [2.90] —— [8.05 
Au = 3.46 — 7.67 
Ag es 2.42 — 7.18 
Hg = 55.80 — 48.74 
Cu = trace oo 0,16 
