Assertion: zircon | /r/HasProperty | one of the oldest minerals
Facets:
value: in the world
type: LOCATION
value: of all the precious gems
type: OTHER
value: on earth
type: LOCATION
Source sentences:
text: Zircon is also of interest to geologists because it is one of the oldest minerals on earth.
text: What this means is that zircon is in fact the oldest thing on earth; the oldest samples are even older than the moon, which formed about 4 billion years ago.
text: Of all the precious gems, zircon is one of the oldest.
text: Zircon is actually the oldest mineral discovered on Earth.
text: • Zircon is the oldest known mineral in the world.
text: Zircon is also of interest to geologists because it is one of the oldest minerals on earth.