Assertion: opal's meaning | /r/AtLocation | use
Facets:
value: for thousands of years
type: TEMPORAL
value: by man
type: OTHER
Source sentences:
text: Spiritual Meaning of Chrysocolla Chrysocolla has been in use by man for thousands of years and got its name around 300 BC when the Ancient Greek philosopher and botanist, Theophrastus, noticed its resemblance to a borax based material which was used as a flux for welding gold pieces –