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 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.
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.
Key words: Mineralogical, petrographical, lithofacies, Salt Range, Permian, Cretaceous, kaolinite, goethite, boehmite, gibbsite, dickite, glauconite, chamosite, chlorite, nacrite, micrite, microclasts.
Origin of Constituting Minerals in Lithofacies of the Hangu Formation Lithofacies-I (laterite / bauxite / kaolinite): The petrographic results show that the principal clay minerals include kaolinite (50-65 (Percent) , boehmite (40-50 (Percent) , gibbsite (upto 30 (Percent) , neoformed clay (chamosite upto15 (Percent) and iron rich clay (glauconite 9-15 (Percent) alongwith nacrite / clinochlore (upto 85 (Percent) at Kalra Wahan) and chlorite (upto 5 (Percent) .
Kaolinite clay group, including kaolinite, gibbsite, boehmite, dickite and nacrite, is abundantally present in laterite / bauxite facies of the study area.
A kaolinite-group mineral similar to nacrite was tentatively identified by XRD.
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.
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/.
1933, The crystal structure of nacrite and a composition of certain optical properties of the kaolin group with its structures.
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