紅こう銀ぎん鉱こうMeanings1nounruby silver oremineralogyTechnical mineralogy term for a silver ore with a red color, specifically pyrargyrite or proustite.紅こう銀ぎん鉱こうは銀ぎんの重じゅう要ような鉱こう石せき鉱こう物ぶつの一ひとつである。Ruby silver ore is one of the important silver ore minerals.