ee et et a ee i 
1886. } Mineralogy and Petrography. 455 
found to contain little rhombohedra of calcite. With twenty 
grams of calcium chloride rhombohedra were obtained, which 
gave on measurement an angle of 105° 46’. Several experi- 
ments were made, but in no case was any aragonite formed. 
Hemostilbite is described by Igelström’ as a new mineral 
from the iron mine of Sjoegrufvau, Grythyttan parish, Sweden. 
It is of a blood-red calor by transmitted light, and is found in 
a gangue of tephroite in fissures with calcite, in a bed of lime- 
Stone in granulite. An optical examination by Bertrand proved 
the mineral to be orthorhombic. The acute. bisectrix is negative 
and is perpendicular to the easy cleavage. The optical angle is 
small and the dichroism very pronounced. In hardness and gen- 
eral appearance it approaches haussmannite. An analysis 
yielded: 
Sb,0, MnO FeO Mg(Ca)O 
37.2 51.7 9.5 1.6 
This composition is represented by the formula, 8MnO, Sb.O,, or 
9Mn0O, Sb,O;, which is very near that of another mineral already 
described under the name of manganostilbite, with which the 
hemostilbite may be identical. 
rocks of the Grosse and Kleine Windgalle. Among the Jurassic 
schists an iron-odlite was found. This consists of'a reddish lime- 
stone containing odlites composed of magnetite, both massive and 
crystallized, in a groundmass of calcite and hematite, with a rim 
of a green fibrous mineral which the,author thinks might be the 
_ Chamosite of Bertier. The crystalline rocks are principally 
ee ware positively which of these is really the case. The paper is — 
| ; 
ranite or a di 
gneisses, hornblende rocks (including a peridotite and a porphy- 
ritic rock composed of large aggregates of hornblende in a coarse- 
Srained plagioclase in which is also a large amount of augite in 
Smaller granular aggregates) and quartz porphyries, which are 
divided into five types. As a result of the pressure to which 
. Pass over into a completely schistose rock in which the 
original constituents can be traced under the microscope by : 
means of their alteration products. From a study of the granit- 
Sa and porphyries from other localities in the same region, © 
chmidt concludes that the Windgille rock is either a facies of 
Stinct rock mass, and that it is not possible to de- 
lustrated by a map and five sections———Michel Lévy has- 
. i gee 
_ Bulletin de la Société Minéralogique, June, 1885, p. 143- i 
eues Jahrb. für Mineralogie, etc., Beil. Bd., 1v, 1886, p. 388. A a 
