1884.] Mineralogy. - 419 
Topaz IN NEVADITE FROM CoLorADO.—The “ nevadite” 9 Chalk 
mountain, Colorado, is a porphyritic rock showing large glassy 
sanidine and many smoky quartz crystals imbedded in a grayish 
ground-mass, and is an eruptive rock, of probably early Tertiary 
age. Mr. W. Cross finds in certain druses very perfect crystals 
of colorless, transparent topaz. Although these crystals are 
very small (% to 3 millimeters in length), they are interesting on 
account of their occurrence in an eruptive rock, all previously 
known occurrences being in granite, gneiss or some other meta- 
morphic rock. In the present case, as indicated by the associated 
minerals, the topaz may be a sublimation product. 
TELLUR-SULPHUR.—There has long been recognized in Japan, 
as being distinct from ordinary sulphur, a full orange-red variety 
under the name of seki-rin-seki (massive red sulphur). This has 
been examined by E. Divers and T. Shimidzu,! who find that 
while it is allied to the selen-sulphur of the Lipari islands, Naples 
and Hawaii, it differs from it in composition, being a tellurium 
sulphur. Analysis yielded 
Te Se As Mo S (by diff.) 
O.I 0.06 0,01 trace 99-76 
When the tellurium sulphur was treated with carbon bisulphide, 
the arsenic remained as sulphide. This red sulphur appears to 
occur at all the deposits of volcanic sulphur in Japan, having been 
ound at a number of localities. It contrasts strikingly with the 
associated yellow sulphur. It would be of interest could the 
chemical state of the tellurium be determined. Meanwhile the 
mineral may be regarded as a variety of sulphur, and might be 
known as tellur-sulphur. 
piney occur at the same locality, which promises to be of finan- 
ence regarding the production of material for gems. 
abo a locality for emeralds has been found in North Carolina, 
Out a mile south-west of the locality now worked at Stacy 
‘Sa The crystals are pale-green, and occur in decomposed 
F. Kase ® associated with quartz, rutile and hiddenite. Mr. J. 
EAR States that this new locality shows that the deposit of 
Gee North Carolina is not an accidental one, and that 
Sa encouragement for future exploration for gems in that 
y pa GICAL Nores.—During the year 1883 sixty mull 
| Ee pares were extracted from the Lake Superior mines. 
= Ozokerite thas been found in the Island Tscheleken in the 
Chem, News, Dec, 21, 1883. 
