"Pottery and porcelain: \u00CDndice adicional"@es . . "Quartz"@es . . . "Quartz or Quartz Sand. Like Lynn or silver sand. This mineral is pure silica and free from lime, al- though the sands may contain some small percentage of iron. Used much like flint for bedding or with alkaline fluxes for the finest glazes."@es . "Quartz or Quartz Sand. Like Lynn or silver sand. This mineral is pure silica and free from lime, al- though the sands may contain some small percentage of iron. Used much like flint for bedding or with alkaline fluxes for the finest glazes."@es . "Quartz (Pottery, for artists)"@es . . "Quartz"@es . .