nacrite


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nacrite

[′nā‚krīt]
(mineralogy)
Al2Si2O5(OH)4 A crystallized clay mineral of the kaolinite group; structurally distinct in being the most closely stacked in the c-axis direction.
References in periodicals archive ?
The XRD and FT-IR indicate the existence of kaolinite poorly ordered, monoclinic, mixed with others mineral, such as halloysite, dickite, nacrite, quartz, illite, feldspars.
nacrite and poorly crystalline kaolinite at 5 to 600[degrees]K.
In the present study, a similar calcination process is adopted to a Tunisian "nacrite" sample in order to elaborate a novel metastable synthetic material, commonly named "metanacrite."
Nacrite belongs to the kaolin polymorph and was previously described in the works of Ben Haj Amara et al.
Key words: Mineralogical, petrographical, lithofacies, Salt Range, Permian, Cretaceous, kaolinite, goethite, boehmite, gibbsite, dickite, glauconite, chamosite, chlorite, nacrite, micrite, microclasts.
The dehydroxylation temperature of most kaolinites ranges from 498 [degree]C to 605 [degree]C, whereas the dehydroxylation of dickite and nacrite occurs at 680 [degree]C.
Nacrite, a clay mineral, occurs in the Veta Potosi as 1-mm spherules composed of minute, radiating, pearly white crystal plates.
The value 7.16 [Angstrom] for the kaolinite monoclinic polytypes dickite (2[M.sub.1]) and nacrite (2[M.sub.2]) counts for [d.sub.002].
A kaolinite-group mineral similar to nacrite was tentatively identified by XRD.
The variety of marl found in mines and quarries is not used by farmers since it occurs in small quantities." It is evident from the context (etymology and reported typical occurrence) that here marga is used--for the first time in the literature--in the sense of nacrite (i.e.
Mineralogists of the 19th century were much more successful in the description of new layer hydrosilicates: allophane, amesite, antigorite, aspidolite, batavite, biotite /a series name/, celadonite, chamosite, chrysotile /a series name/, clinochlore, corundophyllite, cronstedtite, delessite, diabantite, ephesite, glauconite /a series name/, halloysite, kaolinite, muscovite, nacrite /a polytype/, nontronite, palygorskite, paragonite, penninite /or pennine/, phengite /a series name/, phlogopite, polylithionite, pyrophyllite, ripidolite, roscoelite, saponite, sauconite, sepiolite, serpentine, siderophyllite, stevensite, tainiolite, thuringite, vermiculite /trioctahedral and dioctahedral, distinguished in the 20th century/, volkonskoite, zinnwaldite /a series name/.
Special prizes: Highest Game - Lahiru De Silva -- 601 points, Highest Word -- Sonny Hemachandra - NACRITES - 149 points, Highest 'J' word - Sonny Hemachandra JOGS/SUCKING - 89 points.