{"id":292,"count":0,"description":"La pizarra es una roca metam\u00f3rfica y esquistosa de color gris oscuro. Es una piedra que se puede dividir f\u00e1cilmente en placas delgadas y muy regulares. Es una piedra ligera, impermeable y resistente a los agentes atmosf\u00e9ricos y poco gelificante.\r\nMuy com\u00fan en muchas partes de Europa, la pizarra siempre se ha utilizado como material para techos y como revestimiento repelente al agua. Se utiliza no solo para la producci\u00f3n de pizarras y bandejas de billar, sino tambi\u00e9n como material de revestimiento para interiores y exteriores, gracias a su facilidad en el tratamiento, y para la restauraci\u00f3n de edificios hist\u00f3ricos.\r\nLa pizarra generalmente se extrae de la cantera y se prepara en bloques regulares. 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