The presence of syngenite, as seen in XRD patterns, suggests possible pre-hydration or cement storage issues as it generally represents a reaction between arcanite (or other alkali sulfates) and gypsum.
Syngenite may form from a reaction between gypsum and one of the forms of potassium sulfate during storage of a cement .
On the other hand, syngenite
[[K.sub.2]Ca(S[O.sub.4])2-[H.sub.2] O] found at several sites in the Ralska pahorkatina and the Bohemian Paradise (Schweigstillova et al., 2009) was not encountered by the present study.
They include carnallite, cuprite, dolomite, gypsum, halite, hematite, magnesite, pyrite, quartz, rectorite, rinneite, sylvite and syngenite
It was obtained that the best conditions of reaction for the production of potassium sulphate are: temperature of reaction 5[grados]C; the crucial factor in the system studied is the effect of the ammonia which both promotoes the formation of potassium sulphate and also hinders its conversion to syngenite
, the initial solvent composition 32% by weight ammonia in water; weight ratio of gypsum to solvent of 1:5 and size of 75 smaller grain of mehs.
Most of the unusual species described below, including anhydrite, boracite, ericaite, hilgardite, magnesite, rectorite and syngenite were identified by X-ray powder diffraction at Manchester University.
Syngenite [K.sub.2]Ca[(S[O.sub.4]).sub.2][multiplied by][H.sub.2]O
Syngenite occurs as radiating aggregates of white acicular crystals to 1 mm.