Willemite vs Zoisite
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Willemite
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 mi...
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Zoisite
Zoisite is a calcium aluminum hydroxyl sorosilicate mineral belonging to the epidote group. It naturally occurs in a range of colors and is notably recognized for its transparent blue-violet gemstone variety, known as tanzanite. This highly valued gem variety was first identified near Mount Kilimanjaro in the Merelani Hills of Tanzania. Additionally, a green zoisite matrix associated with red ruby...
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