CPV code 44920000 designates Limestone, gypsum and chalk in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
44920000 sits under 44900000 (Stone for construction, limestone, gypsum and slate) and groups 2 more specific sub-codes. When classifying a tender, choose the narrowest code that still covers the full subject of the contract.