Formula: K(AlSi₃O₈)

Species:

Colour: White, grey, greyish yellow, yellowish, tan, salmon-pink, bluish green, green.

Lustre: Vitreous

Hardness: 6 – 6½

Specific Gravity: 2.54 – 2.57

Crystal System: Triclinic

Member of: K Feldspar Group > Alkali Feldspar Group > Feldspar Group

Name: Name given in 1830 by Johann Friedrich August Breithaupt to a reddish to brownish feldspar from Arendal, Norway, and a feldspar with bluish schiller from Stavern (formerly Fredrichsvärn), Norway, from the Greek μικρός (little) and κλινειν (to incline), in allusion to the small departure from monoclinic symmetry.

Co-Type Localities: Arendal, Agder, Norway, Stavern (Fredriksvärn), Larvik, Vestfold og Telemark – Norway

Polymorph of: Kokchetavite, Orthoclase, Sanidine