General Information:
Chemical Formula:
CaY4(CO3)7·9(H2O)
Composition:
(Molecular Weight = 977.90 gm)
Calcium 4.10 % Ca
Yttrium 36.37 % Y
Hydrogen 1.86 % H
Carbon 8.60 % C
Oxygen 49.08 % O
Empirical Formula:
CaY4(CO3)7·9(H2O)
Environment:
Alteration product of rare-earth minerals.
IMA Status:
Approved IMA 1987
Locality:
Pyoronmaa pegmatite, Kangasala, Finland.
Name Origin:
Named after Lauri Lokka (1875-1966), mineralogist and chief chemist, Geological Survey of Finland.
Physical Properties:
Color:
snow white.
Density:
2.92
Habits:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Aggregates - Made of numerous individual crystals or clusters.,
Luster:
Vitreous (Glassy)
Streak:
white
More details...