1895.] Petrography. 997 
enes—a hypersthene and an augite, both of which are pleochroic in the 
same tints parallel to B and C, a difference of color being noticeable 
only in the direction of A. The author notes that the volcanoes on 
the principal fissures have eruptive andesites, while the others have 
yielded basalts. 
Rock Classification.—A new classification of in organic rocks, 
based on the nature and past history of their components, is pro- 
posed by Milch The original rocks are the archaiomorphie, 
embracing those whose constituents have separated from a molten 
magma. Through alteration processes these have given rise to the 
neomorphie rocks, including the three groups: anthi-lytomorphic, allo- 
thi-stereomorphie and anthi-neomorphice. The first of these groups in- 
cludes those rocks whose material was originally in some other condi- 
tion, but whose constituents possess forms independent of outside 
influences, as, for instance, the chemical precipitates. The second 
group embraces those whose material has been transported and been 
laid down with its own form to produce a rock different from the 
original one, as the mechanical sediments. The third group compre- 
hends rocks whose material is in its original position, but in a different 
condition from the original one, as in the case of the residual and 
metamorphic rocks. 
Miscellaneous.—Levy and Lacroix! describe a Carboniferous 
leucite-tephrite from Clermain, that is associated with micaceous 
porphyrites. The tephrite contains large leucites and pyroxenes in a 
groundmass composed of biotite, augite, plagioclase and leucite. All 
of this latter mineral, whether in large or small crystals, is transformed 
into aggregates of albite. 
Palache® announces the discovery of riebeckite and aegerine in the 
8 Neues Jahrb. f. Min., etc., 1895, I, p. 100. 
Forellen granulite of the Gloggnitzer Berges, near Wiener-Neustadt in 
Austria. The rock is a typical granulite, consisting of a quartz-plagio- 
clase aggregate in which are imbedded acicular crystals and grains of 
the amphiboloids mentioned. 
® Neues Jahrb. f. Min., etc., B. B., ix, p. 129. 
7 Bull. Soc. Franc. d. Min., xviii, p. 24. 
