Orthoclase

It occurs as nitrate in nitre (KNO_ {3}), and as silicate in many minerals, such as orthoclase (or potash-felspar) and muscovite (or potash-mica). ❋ Cornelius Beringer (1886)

The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars. ❋ Unknown (2008)

A pomegranate is not a species of granular crystalline rock consisting essentially of quartz, orthoclase-feldspar, and mica, as I spelled it. ❋ Unknown (2006)

(K2O · Al2O3 ·6SiO2), exists as minerals named orthoclase and microcline, melting at 1200°C. ❋ Unknown (1993)

(Common orthoclase feldspar, which is frequently of a brownish pink or flesh color, will do.) ❋ Frank Bertram Wade (N/A)

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. ❋ Various (N/A)

For upon the most cursory inspection of the vein, the eye is arrested at once by the large masses of crystalline orthoclase, the heavy beds of a gray, brecciated quartz and the zones and columns of large leaved mica. ❋ Various (N/A)

Other kinds of felspar, even orthoclase, may however also show the aventurine appearance. ❋ Various (N/A)

In this way I have melted beryl, orthoclase, and quartz. ❋ Various (N/A)

It is usually rich in potash, the predominating felspar being orthoclase, but somewhat deficient in nitrogen and phosphoric acid. ❋ Albert H. Benson (N/A)

It stands to reason that as the presence of potash in a soil is one of the distinguishing features of its fertility, much will depend on the extent to which the orthoclase felspar is present; and also, not only on the extent, but on the state and degree of its disintegration. ❋ Charles Morton Aikman (N/A)

Granite containing orthoclase felspar produces a fairly fertile soil. ❋ Charles Morton Aikman (N/A)

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. ❋ Thomas Anderson (N/A)

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. ❋ Various (N/A)

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. ❋ Thomas Anderson (N/A)

It must be remembered, however, that it is only the orthoclase or potash felspars which contain large quantities of potash -- other felspathic rocks, such as oligoclase and labradorite, being comparatively poor in it. ❋ Charles Morton Aikman (N/A)

This change may be illustrated by quoting the analysis of a kaolin clay formed by the disintegration of orthoclase felspar. ❋ Charles Morton Aikman (N/A)

Granite is a mixture of quartz, felspar, and mica in variable proportions, and the quality of the soil it yields depends on whether the variety of felspar present be orthoclase or albite. ❋ Thomas Anderson (N/A)

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. ❋ Charles Morton Aikman (N/A)

The minerals anorthite, albite, and orthoclase named in this figure are all feldspars; sylvite and halite are chlorides of potash and soda. ❋ Unknown (1915)