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Aluminoceladonite
Aluminoceladonite
	Heulandite with aluminoceladonite inclusions from Nashik District, Maharashtra, India (Dimensions: 14.8 cm x 10.2 cm x 6.5 cm)
General
Category	Phyllosilicate
Formula; (repeating unit)	K(Mg,Fe2+)Al(Si4O10)(OH)2
IMA symbol	Acel
Strunz classification	9.EC.15
Dana classification	71.02.02a.06d
Crystal system	Monoclinic
Crystal class	2/m
Identification
Color	Colorless when pure, green when ferrous iron-bearing
Fracture	Micaceous
Optical properties	Biaxial (-)
Birefringence	0.0190-0.0240
References

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.