1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Feldspar 5) Felspar 6) Gemstone 7) Gemstone mineral 8) Jewel 9) Jewel mineral 10) Mineral jewel 11) Mineral gemstone 12) Potassium mineral 13) Polished jewel 14) Polished mineral 15) Precious gem 16) Prized mineral 17) Prized stone 18) Precious gemstone
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Orthoclase (endmember formula KAlSi3O8) is an important tectosilicate mineral which forms igneous rock. The name is from the Greek for `straight fracture,` because its two cleavage planes are at right angles to each other. Alternate names are potassium feldspar and K-feldspar. The gem known as moonstone (see below) is largely composed of orthocl.....
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http://en.wikipedia.org/wiki/Orthoclase
• (n.) Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.
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http://thinkexist.com/dictionary/meaning/orthoclase/
common alkali feldspar mineral, a potassium aluminosilicate (KAlSi3O8); it usually occurs as variously coloured, frequently twinned crystals in ... [4 related articles]
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http://www.britannica.com/eb/a-z/o/33
A common mineral in igneous rocks, consisting of potassium aluminum silicate (KAlSi
2O
8); it occurs in the form of vitreous crystals of various colors. Orthoclase is one of the end-members (pure compounds) of the feldspar group. See also microcline.
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http://www.daviddarling.info/encyclopedia/O/orthoclase.html
Or'tho·clase noun [
Ortho- + Greek ... to break.]
(Min.) Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See
Feldspar .
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http://www.encyclo.co.uk/webster/O/34
Orthoclase has the formulae KAlSi3O8 and a relative hardness of 6. It is used in the manufacture of porcelain and for other industrial purposes.
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http://www.probertencyclopaedia.com/browse/HO.HTM
A common constituent of most granites and other felsic igneous rocks. Alternate names are alkali feldspar and potassium feldspar. It has the general formula (K,Na)AlSi3O8.
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http://www.scientificpsychic.com/etc/geology-glossary.html
[
n] - a white or colored monoclinic feldspar
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http://www.webdictionary.co.uk/definition.php?query=orthoclase
noun a white or colored monoclinic feldspar
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https://www.encyclo.co.uk/local/20974
a common white or pink mineral of the feldspar group, KAlSiO, having two good cleavages at right angles, and found in silica-rich igneous rocks: used in the manufacture of porcelain.
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https://www.infoplease.com/dictionary/orthoclase
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