Igneous Rocks by Texture - Aphanitic Rocks, Ophitic Rocks, Phaneritic Rocks, Porphyritic Rocks, Pegmatite, Rhyolite, Lamprophyre, Diabase (Paperback)

Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Aphanitic Rocks, Ophitic Rocks, Phaneritic Rocks, Porphyritic Rocks, Pegmatite, Rhyolite, Lamprophyre, Diabase, Andesite, Dacite, Picrite Basalt, Aplite, Basanite, Icelandite, Aphanite, Alkali Basalt, Ankaramite, Rhyodacite, Hawaiite, Mugearite. Excerpt: Lamprophyres (Greek (lamprs) = "bright" and (phro) = to mix) are uncommon, small volume ultrapotassic igneous rocks primarily occurring as dikes, lopoliths, laccoliths, stocks and small intrusions. They are alkaline silica-undersaturated, ultramafic rocks with high magnesium oxide,