General Information:
Chemical Formula:CaAl2(CO3)2(OH)4·3(H2O)
Composition:(Molecular Weight = 336.13 gm)Calcium 11.92 %
CaAluminum 16.05 %
AlHydrogen 3.00 %
H Carbon 7.15 %
C Oxygen 61.88 %
O Empirical Formula: CaAl2(CO3)2(OH)4·3(H2O)
Environment:Secondary mineral associated with allophane.
IMA Status:Accepted IMA 1976
Locality:Khakassky district, Russia.
Name Origin:Named after its chemical composition.
Physical Properties: Cleavage:[100] Perfect, [010] Imperfect
Color:chalky white, bluish white, violet, light yellow, or gray.
Density:2.23
Diaphaniety:Transparent to subtranslucent
Habits:Spherical - Spherical, rounded aggregates., Acicular - Occurs as needle-like crystals., Massive - Fibrous - Distinctly fibrous fine-grained forms.
Hardness:2.5 - Finger Nail
Luster:Vitreous (Glassy)
Streak:white
More details...
CaAl2(CO3)2(OH)3 3(H2O) Alumopharmacosiderite KAl4(AsO4)3(OH)4 6.5(H2O)
