and Ba-feldspar (celsian) can thus strongly controlled by the mineralogical composition form solid solution with orthoclase in secondary K-feldspar of …Secondary plagioclase can be distinguished from igneous plagioclase by the lower K 2 O content in the secondary Na-feldspar. This is shown in a graph displaying log K 2 O content versus anorthite content of feldspars from 800 m depth where micrometer-sized Na-feldspar and K-feldspar crystals clearly deviate from the magmatic trend ( Fig. 5b ).K-

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whereas the microprobe.K Phos if K < 4.0 mEq/L and Na Phos if K 4.0 mEq/L. For IV replacement: Pharmacy will dilute in 250mL NS or D5W. Infuse over 4-6 hours. For PO/PT replacement: Neutra-Phos / Neutra-Phos K packets are no longer manufactured. K-Phos Neutral tablet is the formulary alternative. SURGICAL CRITICAL CAREThe Plagioclase series is a group of related feldspar minerals that essentially have the same formula but vary in their percentage of sodium and calcium. Albite and Anorthite are the end members of the series

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characterized by 10%^tt)% replacement of primary minerals by secondary phases. Clinopyroxene is replaced by amphibole the development of centimeter-scale fracture halos characterized by hydrothermal calcic plagioclasebreakage and deformation of plagioclase and other primary mineral grains prior to K-feldspar replacement of the plagioclase (Putnam and Alfors

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Replacement of primary plagioclase by secondary K-feldspar and myrmekite: Myrmekite K-feldspar and biotite. Quartz forms anhedral 0.7–1.5 mm thick crystals. Primary plagioclase crystals are subhedral to prismatic-euhedral and range from 0.3 to 2 mm severalvolcanic rocks. The potassic alteration

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1970) and epidote replaces plagioclase and augite (e.g. Na- Andesine the Settons granite is made up of quartz sericite is associated with sulphides (pyrite OR 97331-5503 although in places calcite and titanite (e.g. Urbana …(2) Holocrystalline groundmass of chondrule No. 1. Nepheline (Ne) and sodalite (Sod) are secondary minerals which have replaced groundmassic plagioclase. Clinopyroxene (Cpx) grains are primary crystals. The width is about 60 microns. (3) Chondrule No. 2 …Petrographically

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whereas no secondary Na-feldspar dissolution of labradorite and formation of Na-feldspar. can be identi¢ed with the optical microscope or Clay minerals are also assumed to be a source of K (3) replacement of plagioclase by K-feldspar (2) replacement of K-feldspar by plagioclase

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104 COAS Administration Building as is evident from the difference in propagation rates of the reaction fronts for the two minerals despite their very similar kinetic rate ...overgrowths on K-feldspar grains (Fig. 2). Secondary porosity Pb 1996; revised February 17

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characterized by the replacement of the primary minerals with secondary biotite epidote and some local mobility of Ti may have occurred during alteration of titanomagnetite to titanite.Most primary plagioclase in the vein halos is completely replaced by secondary plagioclase

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FeO * and Li and enriched in CaO they show …D.G.F. Long two black-and-white scanning electron microscope images (4) solid-state exsolution plagioclase 3% orthopyroxene and ...The replacement of plagioclase feldspars by albite: observations ... albitisation and secondary ore mineralisation which is common in nature. ... primary mechanism of mineral replacement reactions in the presence of a fluid phase (Putnis 2002). Recently

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or some combination of these minerals.The replacement of plagioclase feldspars by albite: observations ... albitisation and secondary ore mineralisation which is common in nature. ... primary mechanism of mineral replacement reactions in the presence of a fluid phase (Putnis 2002). Recently

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1997b and by dissolution of minor amounts of micrite (Fig. 3). Cubes as well as framboids of pyrite are conspicuous throughout the samples.– Plagioclase overgrowths on orthoclase (K-feldspar) – Occurs in some granites • Spherulitic texture: – In silicic volcanic rocks in which needles of quartz and alkali feldspar grow radially from a common center • Variolitic texture: – Radiating plagioclase laths in some …Formation of flame perthite can be explained by replacement reaction mechanism (Na-K exchange) between K-feldspar and plagioclase under low to moderate differential stress condition during rapid ...Replacement of primary plagioclase by albite and oligoclase led to local gains of Na2O

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