минералогия перлит, жемчужный блеск (разновидность вулканического стекла с перлитовой структурой)
перлит; перлитный
noun Etymology: French perlite, from perle pearl the lamellar mixture of ferrite and cementite in slowly cooled iron-carbon alloys occurring normally as a principal constituent of both steel and cast iron • pearlitic adjective