2023年1月12日 · Texture: The texture of greenschist can vary, but it often exhibits a foliated or layered appearance due to the alignment of platy minerals like chlorite. Color: As the name suggests, greenschist is characterized by its green color, which is a result of the abundance of green minerals like chlorite.

Greenschist is a general field petrologic term for metamorphic or altered mafic volcanic rock. In Europe, the term prasinite is sometimes used. A greenstone is sometimes a greenschist but can also be rock types without any schistosity, especially metabasalt (spilite).

Greenschist is a fine- to medium-grained foliated metamorphic rock dominated by chlorite, actinolite and epidote, with or without albite, quartz and calcite.

Greenschist is a metamorphic rock that is formed under lowest temperatures and pressures and is usually produced by regional metamorphism. Greenschist is available in dark greenish - grey, green colors.

2000年10月25日 · Greenschist is associated with major mountain building events when mafic igneous rocks (basalts or gabbros) are metamorphosed through depth of burial, and proximity to batholiths (click picture for larger version). The next rock in the sequence is amphibolite.

2006年3月28日 · The greenschist is a bright to dark olive-green fine-grained generally evenly foliated rock with fine-scale compositional layering. In the vicinity of Bacon Peak most of this rock is an actinolite-chlorite schist with small amounts of epidote.

Greenschist is a medium-to-coarse-grained foliated metamorphic rock with a schistose texture, meaning it has scales or flakes that can be easily broken apart. It typically contains large amounts of minerals of chlorite, epidote, and serpentine which give it its characteristic greenish color.

Horn Head greenschist with blastomylonitic texture and chlorite porphyroblasts. This greenschist-facies metabasite sample was collected from a narrow, attenuated layer of dark green rock within psammites on the cliff-top near Horn Head.

The thin section of greenschist shows the heteroblastic texture, consist of chlorite, quartz, opaque, calcite, and locally epidote, fine in crystals size. The feldspar grains present as blasto-porpyroblasts, elongate in crytals shape, up to 0.5 mm in size.

2019年3月17日 · Greenschist is a fine-grained to medium-grained foliated metamorphic rock. It is dominated by chlorite (ClO2-), actinolite (Ca2 (Mg,Fe)5Si8O22 (OH)2), and epidote (Ca2 (Al,Fe)2 (SiO4)3 (OH)). Greenschists form by regional metamorphism of mafic igneous rocks, usually basaltic rocks, under greenschist facies metamorphism.