According to the valid STN, a semi-product is as a suitable manure containing magnesium and calcium after removing the fraction above 0.5 mm. On average, the semi-products and raw materials analysed contain 86.64% MgC03 and 8.30% CaC03, which corresponds to 46.46% MgO and 4.65% CaO. They are also suitable for organic agriculture, which demands sufficient contents of magnesium in farm products. An essential portion of magnesium is bound in carbonates, complemented by magnesium in silicate forms. The products have relatively high contents of manganese (1643,68 mg kg-1), although its mobilisable percentage is barely 0.3%. Other controlled microelements (Cu, Zn, Co) are also present in forms unsuitable for vegetables.