Ancylite is a group of hydrous strontium carbonate minerals containing cerium, lanthanum and minor amounts of other rare-earth elements. The chemical formula is Sr(Ce,La)(CO3)2(OH)·H2O with ancylite-Ce enriched in cerium and ancylite-La in lanthanum.[2][3]
Ancylite | |
---|---|
General | |
Category | Carbonate mineral |
Formula (repeating unit) | Sr(Ce,La)(CO3)2(OH)·H2O |
IMA symbol | Anc[1] |
Strunz classification | 5.DC.05 |
Dana classification | 16b.1.1.1 |
Crystal system | Orthorhombic |
Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
Space group | Pmcn |
Identification | |
Color | Light yellow, orange-yellow, yellow-brown, grey |
Cleavage | None |
Fracture | Splintery |
Tenacity | Brittle |
Mohs scale hardness | 4–4.5 |
Luster | Dull |
Streak | White |
Diaphaneity | Translucent |
Density | 3.95 g/cm3 |
Ancylite was first described in 1899 for an occurrence in the Narsarsuk pegmatite in west Greenland and named from the Ancient Greek: αυκιλος for curved in reference to its rounded or distorted crystal form.[2][4]
References
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