Pegmatitic metagabbro in which pyroxene has been altered to hornblende. The Seiland igneous province. Width of sample 9 cm.
Skarn is a metasomatic rock composed of calc-silicate minerals. Skarn is formed at the contact zone between carbonate rocks and silicic magma. Skarn is often rich in hydrothermal ore minerals.
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Breccia is a rock formed from angular gravel and boulder-sized clasts cemented together in a matrix. The angular nature of the clasts indicates that they have not been transported very far from their source. There are several modes of formation for breccia. Some represent consolidated material accumulated on steep hill slopes or at the foot of cliffs. Cataclastic breccias are produced by the fragmentation of rocks during faulting. Volcanic breccias (agglomerates) comprise blocks of lava in…
Granodiorite is a granitoid (quartz-rich plutonic rock) in which the dominant feldspar is plagioclase. Granodiorite is compositionally between other granitoids granite and tonalite. Granodiorite contains more quartz than diorite. This rock type is frequently misidentified as granite.
Ignimbrite is a fiery rock. It is a pyroclastic rock formed by very hot ground-hugging cloud of volcanic ash, blocks, and gases known as pyroclastic flow or pyroclastic density current. Ignimbrite is synonymous with flood tuff, welded tuff, ash-flow tuff and pyroclastic flow deposit
Phlogopite and apatite with enstatite in pegmatite