celadonite


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celadonite

[′sel·ə·də‚nīt]
(mineralogy)
A soft, green variety of mica having high iron content and containing silicates of magnesium and potassium.
References in periodicals archive ?
These two sets of data point to two dioctahedral mica populations, glauconite and celadonite, as will be discussed later.
In fact, the most mature glauconitic micas compositionally reach celadonite composition in view of the current nomenclature (Rieder et al.
Qualitative XRD analysis led to identifying a variety of zeolite species, including analcime, as the dominant zeolytic phase, followed by chabazite, natrolite, thomsonite, wairakite, stilbite, stilbite-Ca, phillip-site and stellerite-Na, thomsonite-Ca, chabazite-Ca and chabazite-Na, with minor stellerite, laumontite, levyne, phillipsite-Na, and gyrolite Other secondary minerals associated with zeolites were celadonite (Fe-rich mica), nontronite (Fe-rich smectite), greigeite (iron sulide mineral), koninckite or bobierrite (phosphates), alunite (sulphate), truscottite (silicate), calcite or dolomite, and quartz Nontronite occurred in most samples.
The secondary minerals nontronite and locally celadonite represent the first crystallised species lining the outer part of the cavities Other mineral phases occurring during the early stage were calcite and cryptocrystalline silica Nontronite was probably formed by basalt devitrification due to hydration, although ferromagnesian mineral phases present in the basalts might have also contributed to its formation.
Spatial and temporal variability in crystallization of celadonites within the Troodos ophiolite, Cyprus: implications for low temperature alteration of the oceanic crust.
Amygdaloidal basalt flows have amygdale fillings principally of celadonite and silica minerals, with minor amounts of zeolite.
Celadonite, silica minerals, "heulandite," analcime, and chabazite predominate in amygdales in the basalt flows and in basalt clasts in the McCoy Brook Formation, suggesting that these minerals were "early" (Fig.
99; all iron is taken as divalent) show a relatively high substitution through the celadonite molecule.
Consulting our Indian Zeolites issue, we see that Shakur is the locality for the well-known cloudy greenish gray heulandite and stilbite crystals which also owe their color to minute, wormlike inclusions of celadonite.
A last item from India: quarries around Sakur (or Shakur), about 90 km southeast of Nasik, have lately produced another large batch of heulandite crystal specimens tinted pale apple-green to dark green by fine-grained inclusions of celadonite.
The geode contact with the country rock is delimited by a very fine-grained celadonite rim.
Existing mineral nomenclature already displays a number of examples of unfortunately similar names that are easily confused; names such as celadonite and caledonite, or mallardite and malladrite can easily be misspelled; names such as rhodesite, rhodizite and rhodusite are euphonically very similar.