Research Results For 'Feldspar'

SPODE

Spode is a variety of porcelain. Josiah Spode began to make feldspar porcelain at Stoke-on-Trent in 1770, and introduced crushed bone into the composition which was a soft paste giving a very transparent body to his pottery.
Research Spode

ADULARIA

Adularia (Moonstone) is a semi-precious, clear, transparent, glassy form of potash feldspar which is found mainly in the crevices of crystalline schists and gneisses, often in beautifully perfect crystals. It has sometimes a pearly, opalescent reflection or play of colours. It derives its name from Adula, a mountain peak in Switzerland, where fine specimens are found.
Research Adularia

AGGREGATE

In geology, aggregate is a term applied to rocks composed of several different mineral constituents capable of being separated by mechanical means, such as granite, where the quartz, feldspar, and mica can be separated mechanically.
Research Aggregate

ALBITE

Albite or soda-feldspar is a widely distributed, rock-forming mineral present in pegmatite dikes and may be found in crystals. It has the formulae NaAlSi3O8 and a relative hardness of 7. Albite is a form of feldspar, and is usually white in colour, hence its name, but is occasionally bluish, grayish, greenish, or reddish white.
Research Albite

ALUNITE

Alunite (alum stone) is a hydrated aluminium and potassium sulphate secondary mineral usually formed by sulphuric acid solutions acting on rocks rich in alkalic feldspar. It is used in the production of alum, the manufacture of styptic pencils, as a dye fixer in the treatment of leather and as a white pigment in paint. It has the formulae KAl3(SO4)2(OH)6 and a relative hardness of 4. Alunite was mined since the 15th century, but was only identified as a distinct mineral in 1824.
Research Alunite

ANDESINE

Andesine is a kind of triclinic feldspar found in the Andes. It has the formulae NaAlSi3O8 and a relative hardness of 6.
Research Andesine

ANDESITE

Andesite is a crystalline igneous rock, occurring mostly in lava flows, but sometimes in dykes and veins. It consists principally of plagioclase feldspar, and is often porphyritic, showing large crystals of feldspar scattered through a fine-grained mass, usually of small feldspar crystals, but often containing much glassy material. Andesite forms most of the recent volcanic rock of the Andes, and is thus named after the Andes.
Research Andesite

ANORTHITE

Anorthite is a widely distributed and abundant rock-forming feldspar. It has the formulae (Na,Ca) AlSi3O8 and a relative hardness of 7.
Research Anorthite

ANORTHOCLASE

Anorthoclase is a feldspar closely related to orthoclase, but triclinic. It is chiefly a silicate of sodium, potassium, and aluminium.
Research Anorthoclase

APHANITE

Aphanite is a very compact, dark-coloured rock, consisting of hornblende, or pyroxene, and feldspar, but neither of them in perceptible grains.
Research Aphanite

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