description Willemite Overview
Willemite is a zinc silicate mineral with the chemical formula Zn2SiO4 and a minor source of zinc ore. It occurs in several colors and forms, but specimens from the Franklin and Sterling Hill zinc deposits in New Jersey are especially associated with bright green fluorescence under shortwave ultraviolet light. The mineral is named after William I of the Netherlands and is collected both for its mineralogical properties and for fluorescent displays.
help Willemite FAQ
What is willemite's chemical formula?
Willemite is a zinc silicate mineral with the chemical formula Zn2SiO4. It can also occur as a minor source of zinc ore.
Why is willemite famous among fluorescent mineral collectors?
Willemite from the Franklin and Sterling Hill zinc deposits in New Jersey is especially known for bright green fluorescence. Under suitable ultraviolet light, that fluorescence can make otherwise ordinary-looking specimens glow strongly.
What colors can willemite be?
Willemite occurs in several colors and forms, although fluorescent green New Jersey specimens are particularly famous. Color alone is not enough for identification because associated minerals and impurities can change its appearance.
Where are classic willemite specimens found?
The Franklin and Sterling Hill zinc deposits in New Jersey are classic localities for willemite. These deposits are well known for fluorescent mineral specimens, especially those showing bright green willemite.
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