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Zaratite (emerald nickel), named after General Zarata of Spain, is a hydrous carbonate of nickel occurring as an emerald-green incrustation on chromite.
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Zarnich is native sulphide of arsenic, including sandarach, or realgar, and orpiment.
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Zechstein is the upper division of the Permian (Dyas) of Europe. The prevailing rock is a magnesian limestone.
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Zeolites are a group of complex silicate minerals mostly occurring in cavities in basic volcanic rocks. They are usually colourless or white and are relatively soft. Formerly used as water softeners, they are used as molecular sieves in the petroleum industry and as drying agents.
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Zietrisikite is a mineral wax, very similar to ozocerite. It is found at Zietrisika, Moldavia, hence its name.
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Zincite is native zinc oxide. It is a brittle, translucent mineral, of an orange-red colour and has the formulae (Zn,Mn)O and a relative hardness of 5. It is an ore of zinc and used in the production of zinc oxide.
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Zinkenite, named after Zinken, director at one time of the Hanoverian mines, is a steel-grey coloured metallic mineral, a sulphide of antimony and lead.
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Zinnwaldite, named after Zinnwald, in Bohemia, where it occurs, is a kind of mica containing lithium, often associated with tin ore.
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Zircon (zirconium silicate) has the formulae ZrSiO4 and a relative hardness of 8. It is a common accessory mineral found in all types of igneous rocks. When transparent it's used as a gemstone.
Zircons contain abundant radioactive isotopes of uranium and so are useful for uranium-lead dating to determine the ages of rocks.
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Zoisite, named after its discoverer its discoverer, Von Zois, an Austrian mineralogist, is a greyish or whitish mineral allied to epidote, occurring in orthorhombic, prismatic crystals, also in columnar masses and formed in high temperature metamorphic rocks. It is a silicate of alumina and lime has the formulae Ca2Al3 (Si3O12)(OH) and a relative hardness of 7.
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Zunyite is a fluosilicate of alumina occurring in tetrahedral crystals in Colorado.
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Abbreviations
Rocks & Minerals
