ws, 
14, 
; 15. 
16. 
ANALYSES, 95 
ANALYSES. 
(61.) Granrre.—The white and bluish felspars represent respectively orthoclase and oligoclase, 
the latter showing faint striæ. These are associated with common black mica and quartz. 
The analysis is of the mass, as the felspars could not be separated,from each other. 
(99.) Eurrric Rock.—Consists of two felspars intermingled with quartz, so thoroughly mixed 
that a separate analysis of the felspars could not be made. One of them is striated; the 
analysis shows it to be oligoclase, In some portions of the specimen black mica was 
found (vide No. 100), which would bring the rock into the class designated by G. Rose as 
granitite, and by Fournet as miarolite. f 
(13.) FELSPAR Porrnyry.—The crystals rendering the mass porphyritic are yellow striated 
oligoclase and glassy non-striated orthoclase. The analysis of the matrix gives almost 
exactly the composition of oligoclase. Whether the small black specks which the rock 
occasionally contains are hornblende or schorl, which they most resemble, could not be 
determined, on account of their small quantity. 
(49.) SerreNTINe.—The analysis of the mass clearly proves the rock to be serpentine, closely 
resembling the serpentine from the Radau Valley in the Hartz Mountains: the fracture, 
showing that the rock has a tendency to turn into schiller-spar, has also its black color 
and its association with chrysctile. 
(64.) GREENSTONE (Diabase).—The analysis of the soluble and insoluble portions of this rock are 
given on page 17 of the Catalogue. The analysis in mass also tends to. prove the com- * 
position of the rock. From the appearance of the specimens of the rock it could not be 
clearly ascertained whether the greenish-black mineral associated with the felspathic 
component was augite or hornbiende. The analysis of the soluble portion proves it to be 
labradorite; and as this species of felspar is always associated with augite, the rock 
should be called diabase. The greenish element of the mass is probably chlorite. 
LSPAR FROM Diorrre.—The portion taken was perfectly separated from all matrix, and 
the analysis shows it to be albite. 
(70a, 70b.) Ertposrre.—The rock consists of quartz, epidote, and hornblende. The analysis 70a 
is of the rock with the hornblende separated, and resembles that given by Dr. Hunt of 
the epidosite of Canada. 70b was another portion, containing less free quartz; it hada 
specific gravity of from 3°21 to 3:26, and taking the specific gravity of epidote as 3°4, 
19 per cent. of the silica may be deducted as quartz, which will leave Si0,41—Al, 0,25 
—Fe, 0; 19—CaO 15, which is the composition of an iron epidote. 
(67.) FE 
(50.) OLDER Basatric CLay.—Color light brown ; 59 per cent. soluble in hydrochloric acid. The 
analysis is of the soluble portion. 
(51.) AmyepatomaL BASALTIC Cray.—A specimen closely resembling No. 51 gave the analysis; 
59 per cent. was soluble in hydrochloric acid. 
(56.) Rep Basauric Cray.—The analysis is from a specimen closely resembling No. 56; 58 per 
cent. was soluble in hydrochloric acid. The analysis is of the soluble portion. 
(60a-b.) The analysis is from a nodule which closely resembled the interior portions of No. 60; 
49 per cent. was soluble in hydrochloric acid, 60a is the soluble portion, 60b the 
insoluble, 
(6.) Newer Basattic.—Basalt (a) is the soluble portion, which is 24 per cent. of the whole; 
(b) is’the insoluble. 
(30.) Metamorriic Rock.—Color black, structure semi-crystalline ; closely resembling ordinary 
hornfels in appearance and composition. 
(18.) Stary SHALE (Mudstone).—Soft, free from grits; easily fused before the blowpipe. 
(7.) Wurre-Anp-YELLOw SANDsTONE,—Formed of white transparent quartz grains, cemented 
together by a white or yellow paste, 
(10.) Fine MICACEOUS SHALY SANDsTonr.—Easily cleaved. 
For other analyses of the Newer Volcanic, vide pages 23 and 28 of the Catalogue. 
