252 Third Supplement to Dana’s Mineralogy. 
has been analyzed by M. A. re and shown to be Chrysolite. He obtained 
(L’Institut, No, 1148, xxiv, 4, Jan. 1856): 
Si Ti Mg Fe Mn H 
36°30 530 49°65 6°00 0°60 1:95==99°80 
aay 18°85 211 19°50 1-79 0:13 173 
Pango have the oxygen ratio 1:1, as in chrysolite. po the 
sae: acid is not ascertained. [This mode of occ ce of 
~seh g is sb en to that of the Boltonite (chrysolite) in granular limectali 
2 ve Glinkite (another bebe in talcose slate. May it be that the titanium is 
a mixture with titani —p.| 
Nistoxire and Heppurre [p. 465, and Bouse 1t].—According to R. P. Greg, 
Ea. in a recent letter to the author, these two species, though curious in them- 
selves, have been found to be artificial. 
p. 887 and Suppl. 1].— Analysis of fibrous copiapite (stypticite) from 
one oni by E. Tobler (Ann, “chy Phar. xcvi, 383) : Saipbtins atid 31:49, 
sesquoxyd of iron 31:69, water 3682 = 
fp.8s 0].—Observed rather pee! by Scacchi about fumaroles 
after the eruption at Vesuvius in 1855 (op. cit., p. 195). = of it is in a brownish 
friable beats obtained by dissolving the maling crus ai —o essen in brownish- 
es hexago nal crystals. Also asa yellowis ish crust, in many parts tinged green, 
mpact in texture, and with a very bright ore in 5 tie fresh fracture. 
Crroute [p. 97 and Suppl. oy —J. W. Tayler, Esq., bas given a descript tion of 
the mode of occurrence of eryolite in Greenland, with wood cut Salve tia in the 
Quart. Jour. Geol. Soc. xii, 140. The locality is at Evigtok, about twelve m 
Arksut, on sed emits of that name. The rock is gneiss and granitic gnebil It is 
intersected by a vein of quartzrock containing coarsely crystallized feldspar, eryo- 
lite, and ores oe irom, pid ey he tantalum, ete., running about southwest, pee: 
other small olite; and de the east and Pach! there is a trap- 
dvke. The main mass of ray forms a be vein paralle strata 
nearly east and west, dipping S 45°, and is shout 80 feet thick ee 300 long. It is 
bounded along the walls by a band of spathic iron, quartz, and in seme parts by 
fluor and galena, while near the walls in the cryolite there are more or less galena, 
ssite i i 
copper and iron pyrites, ete Tantalite and cassiterite occur vg lite. The 
ena contains 45 oz ilver to the nd is worked. In low 
rege is black, and the white ros of the upper Pa is = airbus - pee re to 
heat. e author infers “that the trap now found a’ pee be vyolite ol 
tt Ai it, heating it ees ially and r vaaiotig 
CYANOCHROME, Seacchi—A sulphate of potash and copper, among the pro- 
cts of Vesuvius, at the eruption of 1855 (op. cit. p. 1 sitome blue crystals 
obtained by dissolving and evaporating the saline crust, from the lava of Vesuvius; 
also in azure blue spots upon the white crust. Com aa ey ak + 36a) ee 3H. 
Form of crystals monoclinic. C (or So of rates xis) = 75° 8 
Occurring planes, O, 14, 2i, iz, 1, Z 2 0: oa $04 0: nasties 56, 
O:1i=1419 47’, 0: 2i1= = 116° 49’, I: “fading 
Analysis of a ete op pe athe Chili, by E. Tobler (Ann. Ch. u 
xevi, 383): Sulphuric acid 32:41, — of iy te per 80°77, water rics loss) 36° v2=100, 
decomposition o cai ypyrite. 
Darnourre [p. 334 and Suppl. 1, a —- Schréder has made many n w measure: 
—_. of Sate it > epi ( Pogg i, 84) a“ concludes from: them that the 
the tan ORG of the axis, 90° 7’. He figures a a crystal 
os ot mtg in that table, 
