Aluminoceladonite | |
---|---|
General | |
Category | Phyllosilicate |
Formula (repeating unit) | K(Mg,Fe2+)Al(Si4O10)(OH)2 |
IMA symbol | Acel [1] |
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 | [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]
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]