それが何であるか
The zirconium mineral, mined from the same beach sands as ilmenite. Individual crystals are the oldest known fragments of Earth, over 4.3 billion years old.
鉱石鉱物
Zircon
The zirconium mineral, mined from the same beach sands as ilmenite. Individual crystals are the oldest known fragments of Earth, over 4.3 billion years old.
Zircon-tuc1001b ·
Robert M. Lavinsky ·
CC BY-SA 3.0
· Wikimedia Commons
