Aluminoceladonite

Mineral

(repeating unit)K(Mg,Fe²⁺)Al(Si₄O₁₀)(OH)₂IMA symbolAcel^[1]Strunz classification9.EC.15Dana classification71.02.02a.06dCrystal systemMonoclinicCrystal class2/mIdentificationColorColorless when pure, green when ferrous iron-bearingFractureMicaceousOptical propertiesBiaxial (-)Birefringence0.0190-0.0240References^[2]^[3]

Aluminoceladonite is a low-temperature potassium dioctahedral mica mineral which is an end-member in the illite-aluminoceladonite solid solution series. The chemical formula for aluminoceladonite is K(Mg,Fe²⁺)Al(Si₄O₁₀)(OH)₂.^[4]

Occurrence

Aluminoceladonite is often referred to as a rare mineral, though its actual abundance may be underestimated due to difficulty of identification. Aluminoceladonite, along with other phyllosilicate minerals in the illite-aluminoceladonite solid solution series, has been observed mainly among finely dispersed, mostly inter-layer-deficient, aluminium-rich potassium-dioctahedral mica varieties occurring in sedimentary rocks.^[5]

References

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ "Aluminoceladonite: mineral information, data and localities". Retrieved March 18, 2019.
^ "Aluminoceladonite mineral data". Retrieved March 18, 2019.
^ Drits, Victor A.; Zviagina, Bella. B; McCarty, Douglas K; Salyn, Alfred L. (2010). "Factors responsible for crystal-chemical variations in the solid solutions from illite to aluminoceladonite and from glauconite to celadonite". American Mineralogist. 95 (2–3): 348–361. Bibcode:2010AmMin..95..348D. doi:10.2138/am.2010.3300. S2CID 62881038.
^ Zviagina, Bella B.; Drits, Victor A; Środoń, Jan; McCarty, Douglas K.; Dorzhieva, Olga V. (2015). "The illite–aluminoceladonite series: distinguishing features and identification criteria from x-ray diffraction and infrared spectroscopy data". Clays and Clay Minerals. 63 (5): 378–394. Bibcode:2015CCM....63..378Z. doi:10.1346/ccmn.2015.0630504. S2CID 100485107.