Among the mineral productions is a kind of felspar, which, when polished, exhibits a display of brilliant and beautiful colours.    From Wordnik.com.  [Travels in North America, From Modern Writers With Remarks and Observations; Exhibiting a Connected View of the Geography and Present State of that Quarter of the Globe] Reference

To this period belong the felspar, syenites, and porphyries.    From Wordnik.com.  [Journey to the Interior of the Earth] Reference

Granite containing orthoclase felspar produces a fairly fertile soil.    From Wordnik.com.  [Manures and the principles of manuring] Reference

In this instance the decomposition of the felspar had reached its limit.    From Wordnik.com.  [Elements of Agricultural Chemistry] Reference

It was composed of black and vitreous lava, mixed with fragments of felspar.    From Wordnik.com.  [Twenty-Thousand Leagues Under the Sea] Reference

The west arm of the pier is built on a vein of felspar porphyry, visible at low water.    From Wordnik.com.  [The Cornwall Coast] Reference

Other kinds of felspar, even orthoclase, may however also show the aventurine appearance.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon"] Reference

Some of the heights are of greenish-yellow chloritic felspar, well adapted for brick-making.    From Wordnik.com.  [The Land of Midian] Reference

It has a base of dark green with angular crystals of felspar of a lighter green imbedded in it.    From Wordnik.com.  [Roman Mosaics Or, Studies in Rome and Its Neighbourhood] Reference

On the sea beach I found masses of conglomerate formation, and in the trap occasional lamina of felspar.    From Wordnik.com.  [Narrative of an expedition undertaken for the exploration of the country lying between Rockingham Bay and Cape York] Reference

According as the base potash, soda, or lime predominates, the felspar is known as Orthoclase, Albite, and.    From Wordnik.com.  [Manures and the principles of manuring] Reference

Clays are formed by the disintegration of any of the crystalline rocks; the purest clays being formed from felspar.    From Wordnik.com.  [Manures and the principles of manuring] Reference

All clays contain more or less free silica in the form of sand, and usually a small percentage of undecomposed felspar.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"] Reference

This change may be illustrated by quoting the analysis of a kaolin clay formed by the disintegration of orthoclase felspar.    From Wordnik.com.  [Manures and the principles of manuring] Reference

The four kinds of felspar which have been already named are compounds of silica with alumina, and another base which is either potash, soda, or lime.    From Wordnik.com.  [Elements of Agricultural Chemistry] Reference

The purest clays are produced by the decomposition of felspar, but almost all the crystalline rocks may produce them by the removal of their alkalies, iron, lime, etc.    From Wordnik.com.  [Elements of Agricultural Chemistry] Reference

Owing to the small quantity of felspar which it contains, and the abundance of the difficulty decomposable mica, the soils formed by its disintegration are generally inferior.    From Wordnik.com.  [Elements of Agricultural Chemistry] Reference

"Only very fine, hard granite, with scarcely a grain of felspar," he said.    From Wordnik.com.  [The Crystal Hunters A Boy's Adventures in the Higher Alps] Reference

In green felspar there were small flat discs, hawks, and hippopotamus heads.    From Wordnik.com.  [El Kab] Reference

What lovely pictures you would have made in the old butterfly times, of opal and felspar!.    From Wordnik.com.  [Hortus Inclusus Messages from the Wood to the Garden, Sent in Happy Days to the Sister Ladies of the Thwaite, Coniston] Reference

I observed in Mexico a very singular agglomerated felspar formation superposed upon (perhaps inclosed in) red sandstone, near.    From Wordnik.com.  [Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3] Reference

Thus she contrives to intenerate the granite and felspar, takes the boar out and puts the lamb in and keeps her balance true.    From Wordnik.com.  [Essays — First Series] Reference

On the floor of the square well lay a fragment of a flint bracelet, and some pieces of green felspar, alabaster, and malachite.    From Wordnik.com.  [El Kab] Reference

At length I came upon one -- a flake of felspar of a dull cream-color -- hollowed enough on one side to hold a pint or upwards.    From Wordnik.com.  [Left on Labrador or, The cruise of the Schooner-yacht 'Curlew.' as Recorded by 'Wash.'] Reference

Will Marion at once, and depended greatly upon him for help in his business transactions over the kaolin and felspar upon his land.    From Wordnik.com.  [Menhardoc] Reference