Both ZnO 30 and ZnO 40 display diffraction peaks characteristics of zincite
, at the angular values of 31.8[degrees], 34.6[degrees], and 36.2[degrees].
The ZnO synthesized by both the coprecipitation and the hydrothermal methods had the same XRD pattern corresponding to zincite
(S3, S4, S5, and S6; Table 1).
The dominant phases identified by XRD analysis are zincite
, franklinite and magnetite.
In the oxidation zone, zincite
is widespread as brownish yellow earthy fillings.
Other associated minerals are: smithsonite, zincite
, greenockite and quartz.
Harter (1928), for instance, reported franklinite and zincite
Of course, interesting crystal growth may also happen accidentally, sometimes as a byproduct of industrial operations, as in the case of the artificial zincite
crystals from Poland which appeared on the mineral market in the early 1990's (Robinson and King, 1991; Cooper, 1993).
The following standards were used: sanidine (K K[alpha]), cuprite (Cu K[alpha]), diopside (Ca K[alpha]), nichromite (Ni K[alpha]), zincite
(Zn K[alpha]), synthetic [Cd.sub.5][([PO.sub.4].sub.3](OH) (Cd L[alpha]), gehlenite (Al K[alpha]), synthetic V[P.sub.2][O.sub.7] (V K[alpha]), apatite (P K[alpha]) and phlogopite (F K[alpha]).
All of the determined peaks belong to zincite
(PDF card number 01-079-0208) .
183, Munich 81735), where the specialty item was man-made zincite
. Next to that came an offering of colored alabaster nightlights; then began a group of Moroccan dealers and meteorite sellers.
The zinc aluminate coatings remain in the amorphous state when deposited at substrate temperatures up to 400[degrees]C (Figure 2(a)); as the substrate temperature is increased to 450[degrees]C, some peaks corresponding to hexagonal phase of ZnO (zincite
, ICCD Card File no.
In the first half of the 19th century, to the extent that Franklin and Sterling Hill were thought of as zinc mines, the most avidly sought of their ore species was the bright red zincite
(ZnO) that was often found as large masses and lenses in black franklinite, particularly at Sterling Hill.