1883.| Mineralogy. 781 
CONCRETIONS IN METEORITES.— Dr. J. L. Smith’ describes a 
number of nodular or globular concretions which occur in 
metecrites, and states that the presence of such concretions is 
the general rule in meteoric iron. 
e most common concretions are of troilite, a sulphide of iron. 
These have a dark bronze color and are numerous and often of 
large size. The troilite is often penetrated by a bright yellow 
mineral known as schreibersite, a phosphide of iron and nickle. 
Graphite also sometimes forms nodular concretions, and is com- 
monly mixed with troilite. Daubreelite is another interesting 
mineral mixed with troilite, being a sulphide of iron and chrom- 
ium. A concretion of chromite was found in one meteorite. The 
chromite was black, but a thin section under the microscope was 
of a deep red color. Lawrencite, a green protochloride of iron, 
and aragonite also occur in meteoric iron, the aragonite, however, 
being probably of secondary origin. 
Dr. Smith thinks that the presence of these concretions in- 
dicates a former plasticity of the iron, caused by great heat. 
MINERALOGICAL Notes.—A new edition of E. S. Dana’s Text 
book of Mineralogy has just been issued. The list of new 
minerals is brought up to date, and much important matter relat- 
ing to the crystallographic and optical characters of minerals and 
to new instruments has been added. A report on Virginia 
minerals by Mr. A. S. McCreath of Harrisburg, recently issued, 
contains numerous new analyses of ores, coals, &c., and will be 
of great value to practical men. A variety of wad, to which 
the name /epidophaite has been given, occurs in Thuringia 1a 
fibrous or scaly masses, with silky lustre. It has a reddish brown 
color and soils the fingers when touched. It contains eleven per 
cent of oxide of copper. Gonnard has described an occurrence 
of gedrite in the gneiss of Beauman, near Lyons. e mineral 
is in almond shaped masses, with lamellar or fibrous structure. 
The color is straw yellow to brown, and its characters are those 
of an anthophyllite containing alumina. An emerald from 
Paavo, in Finland, analyzed by F. J. Wiik, was surrounded by a 
zone of radiated red albite, and this again by a yera of muscovite. 
——Wollastonite has been obtained artificially by L. Bourgeois 
by melting together the required amounts of lime and silica at a 
right red heat and cooling for two days in a furnace. A mass 
of acicular crystals was obtained, which, however, had optical 
Properties unlike those of the natural mineral_——-Siderite of a 
light green color occurs on hematite in the Lake Superior dis- 
ict, and is often associated with calcite. It is found either in 
crusts or in single crystals. 7 
‘Amer. Fourn. Sc., June, 1883. 
