Mingder minerals ore color sorter, ccd color sorting machine for mineral stones like calcite, feldspars, quartz ore etc --Hefei Mingder Optoelectronic Technology CO., LTD www.hefeimd.com/en Mob/whatsapp: 008613966725592 Skype: dianahongsmile Email: dianahong@hefeimd.com Tel: 0086-551-62578095