REFERENCE MATERIAL;, COAL MATRIX;, PHYSICAL STATE: SOLID;, FORMAT: PO;, COMPOSITION: SILICON 60,54PCT ALUMINIUM 19,91PCT FERRIC OXIDE 9,44PCT CALCIUM OXIDE 0,5PCT MAGNESIUM OXIDE 1,48PCT POTASSIUM OXIDE 3,55, QUALITY CERTIFICATE: WITH CERTIFICATE;, REFERENCE/MANUFACTURER: AR-2781/ALPHA RESOURCE;