General Information:
Chemical Formula:
Sr(La,Ce)(CO3)2(OH)·(H2O)
Composition:
(Molecular Weight = 381.87 gm)
Strontium 22.95 % Sr
Lanthanum 27.28 % La
Cerium 9.17 % Ce
Hydrogen 0.79 % H
Carbon 6.29 % C
Oxygen 33.52 % O
Empirical Formula:
SrLa0.75Ce0.25(CO3)2(OH)·(H2O)
Environment:
In hydrothermal veins in nepheline syenites.
IMA Status:
Approved IMA (Dana # Added)
Locality:
Marchenko Peak, Mount Kukisvumchorr, Khibina massif, Kola Peninsula, Russia.
Name Origin:
Named for the composition and from the Greek "curved," in allusion to the rounded and distorted character of the crystals.
Physical Properties:
Cleavage:
None
Color:
yellow or yellowish brown.
Density:
3.88
Diaphaniety:
Translucent
Habits:
Crystalline - Fine - Occurs as well-formed fine sized crystals., Pyramidal - Crystals are shaped like pyramids.,
Hardness:
4-4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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