Aluminoceladonite

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.[3]

Aluminoceladonite
Heulandite with aluminoceladonite inclusions from Nashik District, Maharashtra, India (Dimensions: 14.8 cm x 10.2 cm x 6.5 cm)
General
CategoryPhyllosilicate
Formula
(repeating unit)		K(Mg,Fe2+)Al(Si4O10)(OH)2
Strunz classification9.EC.15
Dana classification71.02.02a.06d
Crystal systemMonoclinic
Crystal class2/m
Identification
ColorColorless when pure, green when ferrous iron-bearing
FractureMicaceous
Optical propertiesBiaxial (-)
Birefringence0.0190-0.0240
References[1][2]

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, aluminum-rich potassium-dioctahedral mica varieties occurring in sedimentary rocks.[4]

References
  1. "Aluminoceladonite: mineral information, data and localities". Retrieved March 18, 2019.
  2. "Aluminoceladonite mineral data". Retrieved March 18, 2019.
  3. 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. doi:10.2138/am.2010.3300.
  4. 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. doi:10.1346/ccmn.2015.0630504.
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