Ad
related to: What is plagioclase feldspar?Find deals on plagioclase feldspar on Amazon. Browse & discover thousands of brands. Read customer reviews & find best sellers
Search results
4 days ago · This technique enabled them to measure the magnetization of feldspar plagioclase crystals from a 591-million-year-old rock formation in Passo da Fabiana Gabbros, Brazil. These crystals are common in the Earth’s crust and contain minute magnetic inclusions that record, with high fidelity, the intensity of the Earth’s magnetic field at the ...
1 day ago · Plagioclase is generally smaller (up to 3 mm in length) and less abundant than quartz. Plagioclase occurs between quartz crystals and as veins with exhibiting Carlsbad and albite twinning. Chlorite is developed in quartz and plagioclase or in their interstitial boundaries as fine euhedral crystals of < 0.4 mm in length (Fig. 6 C).
2 days ago · The alkali feldspars are most commonly in a series between potassium-rich orthoclase and sodium-rich albite; in the case of plagioclase, the most common series ranges from albite to calcium-rich anorthite. Crystal twinning is common in feldspars, especially polysynthetic twins in plagioclase and Carlsbad twins in alkali feldspars.
1 day ago · In the latter case, any relevant assimilation of quartz-bearing crustal rocks or crustally-derived melts would shift the melts to silica-richer compositions and therefore force the magma evolution towards Si-rich side of the feldspar thermal divide and to the granite minimum, even if the original primary melt was strongly silica-undersaturated ...
5 days ago · Petrography: (M. Hutson, A. Ruzicka, Cascadia): Much of the thin section is composed of a groundmass of angular grains of pyroxene and feldspar surrounding clasts with poorly defined boundaries. There are a handful of small monomineralic pyroxene clasts rimmed and veined by fayalitic olivine.
4 days ago · plagioclase: 1 n any of a series of triclinic feldspars that form rocks Synonyms: oligoclase Types: albite , white feldspar a widely distributed feldspar that forms rocks anorthite rare plagioclastic feldspar occurring in many igneous rocks Type of: feldspar , felspar any of a group of hard crystalline minerals that consist of aluminum ...
5 days ago · Chondrule mesostases throughout all of the section, with the exception of a single readily discerned clast ~4 × 2 mm in area, is glassy and crystallite-filled. The single clast has a well-integrated texture with barely discernable chondrules and chondrule fragments. All plagioclase feldspar grains observed in this clast are <50 µm across.
