hydrozincite


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Related to hydrozincite: smithsonite

hydrozincite

(ˌhaɪdrəʊˈzɪŋkaɪt)
n
(Minerals) a white carbonate mineral containing zinc
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The nanometric ZnO was obtained as a product of hydrozincite ([Zn.sub.5][(C[O.sub.3]).sub.2][(OH).sub.6]) calcination at 500[degrees]C for five minutes in air.
For this sample (Figure 1(e)), diffraction peaks correspond well to hydrozincite ([Zn.sub.5][(C[O.sub.3]).sub.2][(OH).sub.6]) phase (JCPDS-ICDD 19-1458).
Also, newly formed products such as hydrozincite ([Zn.sup.5][(C[O.sub.3]).sub.2][(OH).sub.6]), smithsonite (ZnCO3), and zinc sulfide (ZnS) are possible in the presence of an appropriate concentration of carbonate and sulfide and under suitable pH conditions [19-23].
The common secondary zinc minerals are smithsonite (ZnC[O.sub.3]), zincite (ZnO), hydrozincite [Z[n.sub.5][(OH).sub.6][(C[O.sub.3]).sub.2], willemite (Z[n.sub.2]Si[O.sub.4]) and hemimorphite [Z[n.sub.4]S[i.sub.2][O.sub.7] [(OH).sub.2] [H.sub.2]O] also known as calamine.
In atmospheric corrosion, zinc oxidizes to form hydrozincite {[Zn.sub.5][(C[O.sup.3]).sub.2][(OH).sub.6]} and smithsonite (ZnCO3) which passivate the zinc surface; that is, these oxidized species protect the metal from further corrosion.
The tablets were mainly made of the zinc carbonates hydrozincite and smithsonite, echoing the widespread use of zinc-based minerals in today's eye and skin medications.
The standards selected for Zn were ferrihydrite adsorbed Zn (Zn-[Fe.sub.5][O.sub.3][(OH).sub.9]), franklenite (Zn,[Mn.sup.2+],[Fe.sup.2+]) [([Fe.sup.3+],[Mn.sup.3+]).sub.2][O.sub.4]), hopeite ([Zn.sub.3][(P[O.sub.4]).sub.2].2([H.sub.2]O)), hydrozincite ((Zns[(C[O.sub.3]).sub.2][(OH).sub.6]), scholzite (Ca[Zn.sub.2][(P[O.sub.4]).sub.2].
(1993) Brianyoungite, a new mineral related to hydrozincite, from the north of England orefield.
They detected different types of hydroxycarbonate phases such as hydrotalcite [[(Cu,Zn).sub.6] [Al.sub.2]C[O.sub.3][(OH).sub.16].4[H.sub.2]O], rosarite [[(Cu,Zn).sub.2] C[O.sub.3](OH).sub.2], aurichalcite [[(Cu,Zn).sub.5][(CO3).sub.2][(OH).sub.6]] and hydrozincite [[Zn.sub.5][(C[O.sub.3]).sub.2][(OH).sub.6]].
Hakusui Chemical, whose shares are traded on over-the-counter market in Japan, is an inorganic chemicals producer known for zinc products (such as zinc powders and hydrozincite), titanium oxide and silica powders (white carbon black).
Hydrozincite [Zn.sub.5][([CO.sub.3].sub.2])([OH.sub.6])