Feldspars crystallize from magma as veins in both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Rock formed almost entirely of calcic plagioclase feldspar is known ... Get Price; feldspar consultingselective staining of k
CHANGES IN K-FELDSPAR STAINING METHODS AND ADAPTATIONS FOR FIELD USE Jouw L. Norp aNr K.q.nr P. EntcKSoN Department of Geology (Ininersi ty of Montana Missoula Montana This note describes changes found useful in staining methods for difierentiation ol K-feldspar and plagioclase and adaptations of the changes for use in the field.
feldspar consultingselective staining of k. Selective staining of K-feldspar and plagioclase on rock slabs and thin sections Am. Mineralogist 45 1020–1025. Google Scholar Broch O. A. 1961. Quick identification of potash feldspar plagioclase and quartz for quantitative thin section analysis Am .
K-feldspar must be exposed to HF vapor or immersed in HF in order to stain it yellow with sodium cobaltinitrite. The white product from the reaction of HF vapor with K-feldspar and leucite is hieratite (cubic KaSiFe) and aluminum trifluoride trihydrate; only hieratite forms by immersion in HF.
feldspar consultingselective staining of k. Thin SectionsQuality Thin Sections quality thin sections. STAINING FELDSPARS. Houghton (1980) gave a method for staining plagioclase and alkali feldspar which is more reliable than previous recipes. REAGENTS (a) potassium rhodizonate (0.01g K-rhodizonate in 30ml distilled water. Get Price
Stains for plagioclase, to be used in conjunction with this K-feldspar stain, have been described by Reeder and McAllister (1957), Bailey and Stevens (I96O), and Laniz, Stevens, and Norman (1964).
feldspar consultingselective staining of k. Selective staining of K-feldspar and plagioclase on rock . Plagioclase feldspars other than pure sodium feldspar are thus stained a brick red by barium rhodizonate. This procedure is combined with the cobaltinitrite staining of K-feldspar to stain K-feldspar yellow and plagioclase red on polished rock ...
feldspar consultingselective staining of k. K-Feldspar is also a major source of lead emissions in the environment and is used toSilver mining from Galena ore feldspar consultingselective staining of k; STAINING FELDSPARS nebula.wsimg. sodium feldspar …
Houghton (1980) gave a method for staining plagioclase and alkali feldspar which is more reliable than previous recipes. REAGENTS: (a) potassium rhodizonate (0.01g K-rhodizonate in 30ml distilled water. (b) Sodium cobaltinitrite (saturated solution; about50g per 100ml distilled water). (c) Barium chloride
Plagioclase feldspars other than pure sodium feldspar are thus stained a brick red by barium rhodizonate. This procedure is combined with the cobaltinitrite staining of K-feldspar to stain K-feldspar yellow and plagioclase red on polished rock surfaces and uncovered thin sections.
K-feldspar megacrysts grow to large sizes early in magma history, while the simultaneously crystallizing quartz and feldspar grains that overgrow irregular megacrysts are interpreted as due to later processes after the growth of euhedral megacrysts (Vernon and Paterson, 2008). Other evidences as the presence of K-feldspar crystals in dioritic
plagioclase is combined with the cobaltinitrite staining of K-feldspar to stain K-feldspar yellow and plagioclase red. Staining of K-feldspar with cobaltinitrite was proposed by Gabriel and Cox (1929) and further de-veloped in studies by Keith (1939A and B), Chayes (1952) and Rosen-blum (1956).
Staining thin sections or polished rock slabs with sodium cobaltinitrite renders the K feldspars yellow and plagioclase red (Quartz is not affected), but this lab method can be a bit messy not the least because it uses hydrofluoric acid to etch the feldspar, and this is a …
plagioclase is combined with the cobaltinitrite staining of K-feldspar to stain K-feldspar yellow and plagioclase red. Staining of K-feldspar with cobaltinitrite was proposed by Gabriel and Cox (1929) and further de-veloped in studies by Keith (1939A and B), Chayes (1952) and Rosen-blum (1956).
PDF | A modified technique for stain differentiation of potassium feldspar and plagioclase in sand grain mounts is described. Because the red amaranth... | Find, read and cite all the research you ...
Staining feldspars in thin section Series editor: I. Dunkl 3/3 - BaCl 2: stable, but BaCO 3 may form and precipitate due to contact with CO 2. Intensity of staining: - The K-rhodizonate stain may be too pale. If so, repeat staining as many times as desirable. - If you have a fine-grained sample, (very fine sand, silt) the plagioclase stain tends to
Staining makes it easy to distinguish between colorless quartz, yellow K-feldspars, and pink plagioclase, making quantitative work (e.g., point counting) quick and accurate. On the other hand, staining obscures details of the stained minerals, and sometimes also of other minerals too, and therefore makes routine petrographic work more difficult.
staining feldspar grains with cobaltinitrite and amaranth after first mounting the grains in lakeside and then exposing them by grinding. Gross & Moran (1970) described a method of mounting the grains on roofing tar which avoids the laborious grinding stage. The main drawback of amaranth is …