Assertion: lead | /r/AtLocation | the mineral
Facets:
Source sentences:
text: As a result, newly-formed zircon deposits will contain no lead, meaning that any lead found in the mineral is radiogenic.
text: Rarely found free in nature, lead is present in several minerals, but all are of minor significance except the sulfide , PbS ( galena , or lead glance), which is the major source of lead production throughout the world.