How To Use Orthoclase In A Sentence
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The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars.
Feldspar
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The biotite-granite continues these trends of increasing orthoclase over plagioclase and biotite over homblende, to produce a coarse-grained pink porphyritic rock in which orthoclase phenocrysts dominate.
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Perhaps 75\% of this is the plagioclase feldspars (mostly albite, oligoclase and labradorite) with the remainder as potassium feldspars (mostly microcline and orthoclase).
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Quartz, microcline or orthoclase and plagioclase are ubiquitous in the Everest granites, which also contain varying amounts of tourmaline, muscovite, biotite and garnet.
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It depends on the felspar present -- _i. e._, whether it is orthoclase, oligoclase, or albite -- whether the soil will be rich in potash or not.
Manures and the principles of manuring
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Amazonite crystals sometimes have white to buff-colored overgrowths of intermediate microcline, sanidine, and/or orthoclase preferentially coating the basal pinacoid and/or various prism faces.
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The mineral occurs with smoky quartz, aegirine, and orthoclase.
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A pomegranate is not a species of granular crystalline rock consisting essentially of quartz, orthoclase-feldspar, and mica, as I spelled it.
There's no "I" in inspiration... wait, what?
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Leucosomes generally plot on the high orthoclase side of the leucogranites and Grampian Granites plot on the low side.
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The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars.
Feldspar
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Associated minerals are white orthoclase, milky quartz, and muscovite.
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He mentions that the amazonite occurred in association with orthoclase (almost certainly microcline), smoky quartz, specular hematite, and rare anhydrite.
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The mica does not everywhere present this coarsely crystalline appearance, but in flexures and lines of union with the quartz and orthoclase is degraded to a mica schist upon whose surfaces appear uranates of lime and copper (autunite and torbernite), and in which are inclosed garnet crystals of considerable size and beauty.
Scientific American Supplement No. 822, October 3, 1891
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(K2O · Al2O3 ·6SiO2), exists as minerals named orthoclase and microcline, melting at 1200°C.
13. Glaze oxides
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In the vein's central vug, ferroaxinite overlies a selvage (fault gouge) of quartz, orthoclase, and microcline feldspar and is followed by fine-grained calcite.
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The central potassic zone is characterized by the presence of potassium-bearing minerals such as orthoclase (a potassium feldspar) and biotite.
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Unfortunately I didn't have enough cobaltite to make all the blue gears on the upper deck so I used orthoclase instead.
Boing Boing
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A slightly bluish-gray feldspar, probably either microcline or orthoclase, without polysynthetic twinning lines occurs as crystals to 2 cm across.
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(Common orthoclase feldspar, which is frequently of a brownish pink or flesh color, will do.)
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public
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The proportions of the constituent minerals which form granite, according to Prof. Phillips, are twenty parts of potash feldspar (orthoclase), five parts of quartz, and two parts of potash mica (muscovite), and a survey of Mr. Wilson's quarry exhibits these approximate relations with surprising force.
Scientific American Supplement No. 822, October 3, 1891
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Calcic amphiboles, including hornblende and actinolite are abundant, and probably are alteration products, which also include albite, orthoclase and rare pyrite.
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The minerals anorthite, albite, and orthoclase named in this figure are all feldspars; sylvite and halite are chlorides of potash and soda.
The Economic Aspect of Geology
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Orthoclase occurred as remnant phenocrysts in a groundmass of chloritic material resulting from alteration of iron-rich felsite cobbles.
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The mica does not everywhere present this coarsely crystalline appearance, but in flexures and lines of union with the quartz and orthoclase is degraded to a mica schist upon whose surfaces appear uranates of lime and copper (autunite and torbernite), and in which are inclosed garnet crystals of considerable size and beauty.
Scientific American Supplement No. 822, October 3, 1891
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In the vein's central vug, ferroaxinite overlies a selvage (fault gouge) of quartz, orthoclase, and microcline feldspar and is followed by fine-grained calcite.
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Feldspars are added as orthoclase in order to reduce the devitrification of the glass.
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Of these, alkali feldspar, particularly orthoclase, is the most common.
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Calcic amphiboles, including hornblende and actinolite are abundant, and probably are alteration products, which also include albite, orthoclase and rare pyrite.
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He further stated that the lithophysae are lined with orthoclase and quartz, and the cavities are partially filled with calcite, quartz, and chlorite.
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Two-feldspar thermometry fails to retrieve peak temperatures from these rocks owing to late stage unmixing reducing the albite content of orthoclase.
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There are, for instance, several different minerals commonly classified under the name of felspar, which have been distinguished by mineralogists by the names of orthoclase, albite, oligoclase, and labradorite; and there are at least two sorts of mica, two of hornblende, and many varieties of zeolites.
Elements of Agricultural Chemistry
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Orthoclase occurred as remnant phenocrysts in a groundmass of chloritic material resulting from alteration of iron-rich felsite cobbles.
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The microgranite has a felsitic groundmass containing microphenocrysts of albite and orthoclase along with phenocrysts of corroded quartz and sporadic dihedral garnet.
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Both the quartz and orthoclase contain dust inclusions and crystallites, while the evidences of shearing and crushing are abundant.
The Long Labrador Trail
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Blocks of anorthoclase - and clinopyroxene-bearing micorgaphic granophyre (click for photo) were ejected with rhyolitic pumice during a late-Pleistocene eruption at the Alid volcanic center, Eritrea.
Granophyre.html
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Some larger grains also occur, and most grains are slightly perthitic showing variable degrees of transformation from orthoclase to microcline.
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Orthoclase is a polymorph of other minerals that share the same chemistry, but have different crystal structures.
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The microgranite has a felsitic groundmass containing microphenocrysts of albite and orthoclase along with phenocrysts of corroded quartz and sporadic dihedral garnet; zircon and apatite are conspicuous accessory minerals.
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Another example is Moonstone - a variety of orthoclase mineral that, when polished, has chatoyant optical property that allows light to show as a crescent in the stone.
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Examples of silicates include quartz, orthoclase, and olivine.
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Those yielded by orthoclase must generally abound in potash, while albite and labradorite, containing little or none of that element, must produce soils in which it is deficient.
Elements of Agricultural Chemistry
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Most of the intrusion comprises a coarse-grained, pink gneissic granite containing numerous augen of recrystallized perthitic orthoclase up to 1.25 cm across.
