A lubricant grease is described comprising at least one base oil, at least one main thickening agent, and optionally one or more additives comprising a second thickening agent in smaller quantities than said main thickening agent and a polymer additive, wherein said main thickening agent is one or more spent bleaching earths, and is present in a quantity up to 80%-90% by weight relative to the weight of the total composition of the grease, and wherein the base oil is fossil oil or oil of biological origin, renewable oil and/or biodegradable oil, or combinations thereof, preferably Group I mineral base oils (GPI), said lubricant grease being an infusible grease and classifiable according to the NLGI scale.