Indigirite

General Information: Chemical Formula:Mg2Al2(CO3)4(OH)2·15(H2O) Composition:(Molecular Weight = 646.85 gm)Magnesium 7.51 % MgAluminum 8.34 % AlHydrogen 4.99 % H Carbon 7.43 % C Oxygen 71.73 % O  Empirical Formula: Mg2Al2(CO3)4(OH)2·15(H2O) Environment:Alteration zone. IMA Status:Approved IMA 1971 Locality:Sarylakh Au-Sb deposit, Indigirka River, northeastern Yakutia, Russia. Name Origin:Named after the locality.Physical Properties: Color:snow white. Density:1.6 Diaphaniety:Translucent Habits:Acicular - Occurs as needle-like crystals., , Hardness:2 - Gypsum Luster:Vitreous - Silky Streak:whiteMore details...

Mg2Al2(CO3)4(OH)2 15(H2O)