Lexic.us

Definition of Orthoclase

1. Noun. A white or colored monoclinic feldspar.

Definition of Orthoclase

1. n. Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.

Definition of Orthoclase

1. Noun. (minerology) Potassium aluminum silicate, KAlSi₃O₈, a common feldspar of igneous, plutonic, and metamorphic rocks. Orthoclase is the main feldspar of pegmatite occurrences, where it is most commonly flesh-colored. Orthoclase is used in the ceramic and glass industries and as a decorative gravel. ¹

¹ Source: wiktionary.com

Definition of Orthoclase

1. [n -S]

Medical Definition of Orthoclase

1. Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar. Origin: Ortho- + Gr. To break. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Orthoclase

Literary usage of Orthoclase

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Roman Comagmatic Region by Henry Stephens Washington (1906)
"Soda-orthoclase.—A constant feature of the alkali-feldspars of the region is that pure orthoclase seems never to occur, notwithstanding the highly potassio ..."

2. A System of Mineralogy: Descriptive Mineralogy, Comprising the Most Recent by James Dwight Dana, George Jarvis Brush (1868)
"orthoclase is an essential constituent of many rocks. 1. Granular crystalline. Granite and gneiss, which consist of orthoclase, quartz, ..."

3. A System of Mineralogy: Descriptive Mineralogy, Comprising the Most Recent by James Dwight Dana, George Jarvis Brush (1890)
"Albitic granite, a granite containing albite as well as orthoclase. ... The finest and largest crystals of orthoclase occur in granitic or feldspathic veins ..."

4. Elements of Chemical and Physical Geology by Gustav Bischof (1855)
"White or grey transparent \ orthoclase crystals from the I Delesse f . ... orthoclase crystals from Baveno V. Grey orthoclase from the Quarry ville granite, ..."

5. Mineralogy: An Introduction to the Scientific Study of Minerals by Henry Alexander Miers (1902)
"At many localities in Cornwall the granite contains large porphyritic crystals of orthoclase; Carlsbad twins are very frequent, and the crystals are often ..."

6. The Americana: A Universal Reference Library, Comprising the Arts and ...edited by Frederick Converse Beach, George Edwin Rines edited by Frederick Converse Beach, George Edwin Rines (1912)
"A part of the potash of orthoclase may be replaced by soda. ... Such an orthoclase is called soda-orthoclase. Soda- orthoclase has a chemical composition ..."

7. Geology of Wisconsin: Survey of 1873-1879 by Wisconsin Chief Geologist (1880)
"We observe in a thin section streaks and clusters of a reddish dust-like matter strewn through the colorless substance of orthoclase. Under a high objective ..."

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