Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A whitish gray, pink or green triclinic mineral of the potassium feldspar group that forms from relatively low-temperature magmas.
from The Century Dictionary.
- noun A feldspar identical in composition with orthoclase, but belonging to the triclinic system.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) A mineral of the feldspar group, like orthoclase or common feldspar in composition, but triclinic in form.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A common
feldspar ofigneous ,plutonic , andmetamorphic rocks , made of potassium aluminum silicate, with thechemical formula K Al Si 3O 8. Microcline is the main feldspar ofgranite . The bluish-green variety is calledamazonstone , and is sometimes of gem quality. Used inceramics , ceramicglazes , and as a scouring powder.
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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Shimmering with dazzling soft lavender, violet or lilac luster to a deeper dark and mysterious purple with whirling patterns of black Augite, microcline feldspar lucid crystals tinged with orange Tinaksite describes the rare and recently discovered mineral gem Charoite.
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The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars.
Feldspar 2008
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(K2O · Al2O3 ·6SiO2), exists as minerals named orthoclase and microcline, melting at 1200°C.
13. Glaze oxides 1993
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Various mineral localities occur throughout the county, of which some of the most important occur on the shore at Portsoy, as for example the gabbro masses in Portsoy Bay with enstatite, hypersthene and labradorite, the graphic granite with microcline, muscovite and tourmaline at East Head, the chiastolite-schist west of the marble quarry, the mottled serpentine with strings of chrysotile.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" Various
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The principal minerals are, plagioclase, biotite and microcline, with smaller quantities of quartz, iron oxide, pyroxene and garnet.
The Long Labrador Trail Dillon Wallace 1901
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Plagioclase, microcline and quartz are the predominating minerals, while biotite, titanite, epidote, apatite, zircon and garnet are present in smaller quantities.
The Long Labrador Trail Dillon Wallace 1901
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Radioactivity is continuous and mineralization is concentrated in the quartz-rich veins with accessory microcline, albite and zircon.
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Perhaps 75\% of this is the plagioclase feldspars (mostly albite, oligoclase and labradorite) with the remainder as potassium feldspars (mostly microcline and orthoclase).
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