A mineral, typically greenish-yellow and fluorescent, consisting of a silicate of zinc.
- Associated minerals can include cerussite, anglesite, pyromorphite, smithsonite, hemimorphite, wulfenite, willemite, vanadinite, descloizite, caledonite, and others.
- Hemimorphite, cerussite, willemite, and chrysocolla occur in all the mines.
- Local collectors had tentatively identified it as willemite or smithsonite, based perhaps on the occurrence of botryoidal blue hemimorphite at the same locality.
Mid 19th century: from the name of Willem I (1772–1843), king of the Netherlands, + -ite1.
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