Ancylite information

Ancylite
Ancylite
	Nenadkevichite with ancylite crystals on the side
General
Category	Carbonate mineral
Formula; (repeating unit)	Sr(Ce,La)(CO3)2(OH)·H2O
IMA symbol	Anc
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 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 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]

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ ^a ^b http://webmineral.com/data/Ancylite-(Ce).shtml Webmineral data Ancylite-Ce.
^ http://www.handbookofmineralogy.org/pdfs/ancylitela.pdf^{[permanent dead link]} Handbook of Mineralogy.
^ http://www.mindat.org/min-216.html Mindat.

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[Webmin-2] ttp://webmineral.com/data/Ancylite-(Ce).shtml Webmineral data Ancylite-Ce.

[Handbook-3] ttp://www.handbookofmineralogy.org/pdfs/ancylitela.pdf^{[permanent dead link]} Handbook of Mineralogy.

[Mindat-4] ttp://www.mindat.org/min-216.html Mindat.

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