NOVELTY - The mineral gas adsorber comprises naturally occurring layer silicates with three layer structure, naturally occurring holloysite and/or modified layer silicates with three layer structure. The naturally occurring layer silicate is smectite-rich clays/bentonites. The modified layer silicate is smectite-rich clays/bentonites that are acid activated or soda activated. The mineral gas adsorber is agglomerated three layer silicates with uniform particle seam in the particle size of 1-5 mm and is crushed grains or granulates, whose specific surface is 100-800 m2/g.    USE - Mineral gas adsorber useful in a filter module for purifying crude biogas, for the protection from damages of conversion unit of gas processing plant, for the protection from damages of biogas- and/or landfill gas plant and for the security/stabilization of gas quality (all claimed).    ADVANTAGE - The mineral gas adsorber ensures rapid purification of crude biogas by effectively removing harmful gas components from the biogas.    DETAILED DESCRIPTION - The mineral gas adsorber comprises naturally occurring layer silicates with three layer structure, naturally occurring holloysite and/or modified layer silicates with three layer structures, as active component for removing harmful or undesired gas component such as hydrogen sulfide and ammonia from the crude biogas. The naturally occurring layer silicate is smectite-rich clays/bentonites. The modified layer silicate is smectite-rich clays/bentonites that are acid activated or soda activated. The mineral gas adsorber is agglomerated three layer silicates with uniform particle seam in the particle size of 1-5 mm and is crushed grains or granulates, whose specific surface is 100-800 m2/g and cation exchange capacity of greater than 50 mval/100 g. The agglomerates or granulates are naturally occurring or modified smectite-rich clays/bentonites with montmorillonite portion of greater than or equal to 75%. The mineral gas adsorber is naturally occurring halloysite of type 7 Angstrom or 10 Angstrom and is distributed in granulate form (0.1-5 mm). The adsorber has a nanopore volume of 30%. The portion of mineral halloysite is greater than 5%. The adsorber consists of additional active charcoal as an active component for removing the gas component. INDEPENDENT CLAIMS are included for:    (1) a filter;    (2) a filter module; and    (3) a method for removing harmful or undesired gas component from crude biogas.    DESCRIPTION OF DRAWING(S) - The figure shows a graph of a result for smectite-rich clays in a long-term test.