felspars

The upper part of the Fiumara also showed abundant scatters of water-rolled stones, serpentines, and hard felspars, whose dove-coloured surface was streaked with fibrils and at times with regular veins of silvery lustre, as if brought out by friction of the surface.

The Land of Midian 2003

If potassium and sodium are found in the chemical analysis, but the compounds are not water soluble, they may indicate the presence of fluxes such as the felspars or micas.

Chapter 5 1984

Beyond this point the allowable thickness must depend on the nature of the rock; a good general rule is to get the section just so thin that felspars show the yellow of the first order in a polarising, microscope.

On Laboratory Arts Richard Threlfall

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.

Manures and the principles of manuring Charles Morton Aikman

It is observed that different felspars undergo decomposition with different degrees of rapidity but after a certain time they all begin to lose their peculiar lustre, acquire a dull and earthy appearance, and at length fall into a more or less white and soft powder.

Elements of Agricultural Chemistry Thomas Anderson

These reagents will attack the bisilicates and felspars.

Getting Gold: a practical treatise for prospectors, miners and students

The flows from Kibo include nepheline and leucite basanite lavas rich in soda felspars.

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Various

According as these various felspars are present in a soil, so will the quality of the soil be.

Manures and the principles of manuring Charles Morton Aikman

The name was afterwards applied by G. Tschermak to those plagioclase felspars which lie between labradorite and anorthite; and this has been generally adopted by petrologists.

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various

The felspars are composed of silica and alumina, along with potash, soda, and lime, with traces of iron and magnesia.

Manures and the principles of manuring Charles Morton Aikman