铁镁质

Traditional form:

鐵鎂質

Pinyin (reading):

tiěměizhì

Definitions:

• mafic rock (containing magnesium and iron, so comparatively heavy, making oceanic plates)

Characters:

• 铁 - iron; strong, solid, firm
• 镁 - magnesium
• 质 - essence, nature; material, substance

Traditional characters:

• 鐵 - iron; strong, solid, firm
• 鎂 - magnesium
• 質 - essence, nature; material, substance