nacrite


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nacrite

(ˈneɪkraɪt)
n
(Minerals) a clay mineral of the kaolinite group
References in periodicals archive ?
The minerals of the kaolin group comprises kaolinite, dickite, nacrite, and halloysite with kaolinite being the most common (Murray, 2007).
2]), clay minerals (montmorillonite, nacrite, kaolinite) and iron and manganese oxides were identifiable phases throughout the profile (Table 1).
1989) argue that the FT-IR spectrum as described above could be an indicative of the existence of dickite and nacrite instead of a disordered kaolinite.
The minor minerals like glauconite, chamosite, chlorite and nacrite could be due to the influx of shallow marine water.
Nacrite (the monoclinic polymorph of kaolinite and halloysite) was tentatively identified in vugs by Mark Bandy (1944) as white hexagonal-tabular microcrystals with pearly luster, especially in younger veins.
The generalized succession scheme according to Kaspar (1939) is (from oldest to youngest): older carbonates (siderite, ankerite, dolomite), barite, sulphides, whewellite, nacrite, young carbonates (calcite) and secondary minerals (sulphates).
Other, less common mineral species that have been reported from the Klein Spitzkoppe occurrences include bixbyite, chabazite, columbite, euxenite-(Y), gibbsite, nacrite, opal (hyalite), pyrophyllite, talc, ferberite and zircon.
1989, Infrared study of structural OH in kaolinite, dickite, nacrite and poorly crystalline kaolinite at 5 to 600K.
arsenic, arsenopyrite, arsenosulvanite, barite, (*) berndtite, bismuthinite bournonite, calcite, cassiterite, chalcopyrite, chlorargyrite, diaphorite, franckeite, freibergite galena, goethite (iridescent), goslarite, halotrichite, hematite, jamesonite, jarosite, matildite, melanterite, miargyrite, nacrite, (*) ottemannite, phosphophyllite, pickeringite, pyrargyrite, pyrite, pyrostilpnite, quarz, siderite, sideronatrite, siderotil, silver, smitsonite, sphalerite, stannite, stephanite, stibnite, tetrahedrite, valentinite, voltaite, wavellite, wolframite, wurtzite Cerro San Pedro Large orthoclase phenocrysts, often replaced by quartz, chlorite, siderite, etc.
Dickite and nacrite are chemically identical to kaolinite but have their layers stacked in alternative regular sequences.
Nacrite, a clay mineral, occurs in the Veta Potosi as 1-mm spherules composed of minute, radiating, pearly white crystal plates.