Micro-cline

microcline

[mahy-kruh-klahyn]
noun
a mineral of the feldspar group, potassium aluminum silicate, KAlSi 3 O 8 , identical in composition with orthoclase but having triclinic instead of monoclinic crystals, used in making porcelain.

Origin:
1840–50; micro- + -cline < Greek klī́nein to lean1, referring to the angles between its cleavage planes, which differ slightly from 90°

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World English Dictionary
microcline (ˈmaɪkrəʊˌklaɪn)
 
n
a white, creamy yellow, red, or green mineral of the feldspar group, found in igneous, sedimentary, and metamorphic rocks: used in the manufacture of glass and ceramics. Composition: potassium aluminium silicate. Formula: KAlSi3O8. Crystal structure: triclinic
 
[C19: from German Mikroklin, from mikro-micro- + Greek klinein to lean; so called because its cleavage plane is slightly different from 90°]

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American Heritage
Science Dictionary
microcline   (mī'krō-klīn')  Pronunciation Key 
A white, pink, red-brown, or green type of potassium feldspar. It is dimorphous with orthoclase feldspar, differing from it in shape and in the fact that it forms at lower temperatures.Chemical formula: KAlSi3O8.
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