Silicate minerals, such as K-feldspar, leucite, nepheline, kalsilite
, muscovite, biotite and phlogopite, can readily provide K to plants.
A series of crystalline phases summarized by the reaction sequence kaolinite K-chabazite zeolite K-F unidentified potassium aluminosilicate phase kalsilite
+ leucite was identified in the system [K.sub.2]OSi[O.sub.2]-[Al.sub.2][O.sub.3]-[H.sub.2]O by Rios (2008).
Name: For the relationship with kalsilite
the most common form of KAlSi[O.sub.4] in nature; the prefix mega (from the Greek [mu][epsilon][gamma][alpha][zeta]) alludes to the much higher unit cell volume of this mineral (2403 [[Angstrom].sup.3]) compared to that of kalsilite
Relationship to other species: It has some structural similarities to kalsilite
, KAlSi[O.sub.4], and beryllonite, NaBeP[O.sub.4].