砂さ鉄てつ

noun

iron sand; magnetite sand

Refers to black sand rich in magnetite, historically used in Japanese iron smelting (tatara).

• 砂さ鉄てつから鉄てつを作つくる伝でん統とう的てきな方ほう法ほうがある。

  There is a traditional method of making iron from iron sand.