Microscopical petrography 6
Book digitized by Google and uploaded to the Internet Archive by user tpb. Half-title: Professional papers of the Engineer department, U.S. army. no. 18 .. Introductory letter.--Letter to the geologist in charge.--Introductory.--Crystalline schists and related rocks.--Granite and granite-porphyry.--Felsite-porphyry and syenite.--Diorite, hornblende-porphyry, diabase, melaphyre, gabbro.--Propylite, quartz-propylite, hornblende-andesite, dacite.--Trachyte, rhyolite.--Basalts.-Leucite rocks.--Clastic rocks
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