词汇 | albite |
释义 | BETA Examples of albitealbite isn’t in the Cambridge Dictionary yet. You can help! The mineral assemblage of the studied calcschist (sample 1435) comprises calcite, quartz, phengite, chlorite, albite and graphite. These aquatic conditions support the formation of albite because of a high volatile content in the water. This present fabric is made of a phengite-chlorite foliation and recrystallized albite- and quartz-rich ribbons. The mineral assemblage includes quartz (30-40 %), alkali-feldspar (30-55 %), albite (5-20 %), muscovite (1-8 %) and garnet (1-5 %). The granite is foliated, whereas the albite granite is unfoliated. Lath-shaped plagioclase is albite in composition and pyroxene has been mainly replaced by tremolite. The final metamorphic stage in both units is post-kinematic, and involves static growth of albite porphyroblasts and chlorite. In schist intercalations within the marbles mineral assemblages include chlorite, calcite, albite, phengite and quartz. The granite and albite granite are medium-grained, whereas the microgranite is relatively fine-grained, and all facies show hypidiomorphic granular textures. Both shear directions relate to growth of greenschist-facies minerals (albite-chlorite). In a few samples faint syntaxial growth of quartz (on quartz grains) and of albite on oligoclase grains was detected. Accessory phenocrysts include untwinned albite of < 8 %, magnetite < 4 % and zircon in trace, as well as replacement pyrite of < 12 % and chalcopyrite in trace. |
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