�y��vlog

In early years as ing�nieur des mines he investigated and described various new minerals; he proceeded afterwards to the study of rocks, devising new methods for their determination, and giving particular descriptions of melaphyre, arkose, porphyry, syenite, &c.

Apophyllite is a mineral of secondary origin, commonly occurring, in association with other zeolites, in amygdaloidal cavities in basalt and melaphyre.

In China, at the close of the period, there were enormous eruptions of melaphyre, porphyrite and quartz-porphyry.

Melaphyre is a name given to the very dark varieties of altered augitic lavas, rich in magnetite and chlorite.

In the older rocks, basalt has often undergone decomposition into melaphyre; and amongst the metamorphic rocks it has been changed into diorite or hornblende rock; the augite having been converted into hornblende.