Microcline (KAlSi 3 O 8) is an important igneous rock -forming tectosilicate mineral. It is a potassium -rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase.

2023年4月23日 · Microcline is one of the most common feldspar minerals. It can be colorless, white, cream to pale yellow, salmon pink to red, or bright green to blue-green. Microcline forms short prismatic or tabular crystals that are often of considerable size: single crystals can weigh several tons and reach yards in length.

Microcline. Comments: Opaque blocky tan crystal of microcline. Location: Moat Mountain, near Conway, Carroll County, New Hampshire, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species

Microcline forms in more slowly cooled rocks like granite pegmatites, whilst Sanidine forms in rapidly cooled volcanic rocks (eg. Rhyolite ) and some high level intrusive dykes. Orthoclase is the most common member of the series, being the dominant K-feldspar in most granite and other plutonic rocks, with an intermediate cooling regime.

Detailed description, properties, locality information guide about the potassium feldspar mineral microcline and amazonite.

Microcline is the form of potassium feldspar that is stable at the lowest temperatures. Its structure differs from that of orthoclase because of a different distribution of silicon and aluminum atoms in its aluminosilicate crystal framework. Microcline exhibits a variation in symmetry.

Commonly cross-hatched twin pattern (tartan/gridiron) formed by intersecting albite and perthite twins. It may be untwinned or have simple twins: commonly Carlsbad, Baveno and Maneback twins. Exsolved albite may form lamellae, irregular ribbons and blebs to form perthite.

Microcline (KAlSi 3 O 8) is the triclinic low-temperature K–feldspar stable at temperatures lower than 500 °C. It is usually formed by recrystallization from feldspar, and sometimes by direct crystallization from magma and hydrothermal processes.

The meaning of MICROCLINE is a triclinic mineral of the feldspar group that is like orthoclase in composition.

2014年6月7日 · Microcline (KAlSi 3 O 8) is an important igneous rock-forming tectosilicate mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase.