aluminoceladonite
{{Short description|Phyllosilicate mineral in the mica group}}
{{Infobox mineral
| name = Aluminoceladonite
| category = Phyllosilicate minerals, mica group, celadonite subgroup
| image = Aluminoceladonite-Heulandite-Ca-345165.jpg
| imagesize =
| caption = Heulandite with aluminoceladonite inclusions from Nashik District, Maharashtra, India (Dimensions: 14.8 cm x 10.2 cm x 6.5 cm)
| formula = K(Mg,Fe2+)Al(Si4O10)(OH)2
| molweight =
| strunz = 9.EC.15
| dana = 71.02.02a.06d
| system = Monoclinic
| class = 2/m
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| color = Colorless when pure, green when ferrous iron-bearing
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| fracture = Micaceous
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| opticalprop = Biaxial (-)
| birefringence = 0.0190-0.0240
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| references = {{cite web|url=https://www.mindat.org/min-6795.html|title=Aluminoceladonite: mineral information, data and localities|access-date=March 18, 2019}}{{cite web|url=http://webmineral.com/data/Aluminoceladonite.shtml#.XI-trRNKh1M|title=Aluminoceladonite mineral data|access-date=March 18, 2019}}
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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.{{cite journal|last1=Drits|first1=Victor A.|last2=Zviagina|first2=Bella. B|last3=McCarty|first3=Douglas K|last4=Salyn|first4=Alfred L.|year=2010|title=Factors responsible for crystal-chemical variations in the solid solutions from illite to aluminoceladonite and from glauconite to celadonite|journal=American Mineralogist|volume=95|issue=2–3|pages=348–361|doi=10.2138/am.2010.3300|bibcode=2010AmMin..95..348D|s2cid=62881038}}
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.{{cite journal|last1=Zviagina|first1=Bella B.|last2=Drits|first2=Victor A|last3=Środoń|first3=Jan|last4=McCarty|first4=Douglas K.|last5=Dorzhieva|first5=Olga V.|year=2015|title=The illite–aluminoceladonite series: distinguishing features and identification criteria from x-ray diffraction and infrared spectroscopy data|journal=Clays and Clay Minerals|volume=63|issue=5|pages=378–394|doi=10.1346/ccmn.2015.0630504|bibcode=2015CCM....63..378Z|s2cid=100485107}}
References
{{reflist}}
{{commons category|Aluminoceladonite}}
{{Phyllosilicates}}