Geology and Mineralogy. 155 
soca ae eu 72°19 
Fixed ¢ 21°41 
6°40 
100-00 
The empirical formula calculated is C,,H,,O,,, which requires 
C 30:15, H 5°58, O+ N 64°32=1 
In physical characters this substance very closely resembles the 
dopplerite of Haidinger, from Aussee (see “Dana’s Min., p. - 
but is different in composition. Similar jelly-like hydrocarbons 
have been eceuiined By others. Lewis suggests that these jelly- 
like hydrocarbons may be grouped together under the name 
marconiitts Eee. but the new name seems very unnec- 
ssary.—Am. Phil. Soc. Philadelphia, Dee. 2 1881. 
12. Brief notices of some recently pa minerals.—BERGA- 
MASKITE is a variety of amphibole remarkable as containing no 
magnesia. It occurs in a caraoie hornblende-porphyry from 
Monte Altimo, Province of Bergamo, Italy. orms acicular 
net gee ihweny striated, with pr ismatic cleav age at an angle of 
Gud An analysis gave: —(%) SiO, 36°78, Al,O, 
15. 18, FeO, 14 46, FeO 22°89, CaO 5:14, MgO 0° 98, ne ‘0 4:00, 
K,O 0°42, loss 0-25==100. ars congrtt in Z. Kryst., 
‘Lrriproxr nitE.—E, Scacchi describes blue lapilli Be "Vesuvius, 
n analysis gave: SiO, 71°57, CuO 6-49, Fe O4 02, K,O 10° 92, 
Na,O 6:78=99-78. Fuses easily ; the eee consisting of au- 
gite, olivine, ete, is infusible. The author on the ground. of the 
fusibility regar Js the substance asa mixture of quartz and the 
carbonates of poly oe and sodiu Obviously the name given 
does not gic - aes definite oe species.— Rend. Accad. 
Napoli, Dee., 
ombs is covered with mica.—Acead. es. Trans., U1, v, 1881. 
go BLANOTERITE. —Massive, cleavable in two directions. H.= 
5. G.=5°73. Luster metallic to resinous. Color, black to 
blackiair ores, Opaque. Analysis gave: SiO, 17°32, Fe,O, 23:18, 
PbO 55-26, on 0°20, FeO 0°75, MnO 0°69, CaO 0- 02, MeO 0°59, 
K,0 0:24, Na,O 054, BaO 0-11 (2), CL 0°14, P,O, 0°07, ign. 0-93= 
100-04, The ‘calculated formula is Pb, Fe,Si ‘O.. Described by 
G. oe as occurring with native “lead, ‘magnetite and ies 
it 
low garnet at Longban, in Wermland, Sw eden. This loca 
has scam dee furnished ‘two other silicates of lead—hyaloteki ite 
and ganomalite.— Gf». Ak. Forh. Stockholm, xxxv, 6, 
13. Artificial Brcatite — Chrysolite, —M. St.’ Meunier has 
recently succeeded in forming artificially a variety of minerals by 
