ancylite

{{Short description|Group of hydrous strontium carbonate minerals}}

{{Infobox mineral

| name = Ancylite

| image = Nenadkevichite-Ancylite-20236.jpg

| alt =

| caption = Nenadkevichite with ancylite crystals on the side

| category = Carbonate mineral

| formula = {{chem2|Sr(Ce,La)(CO3)2(OH)*H2O}}

|IMAsymbol=Anc{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}

| molweight =

| strunz = 5.DC.05

| dana = 16b.1.1.1

| system = Orthorhombic

| class = Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)

| symmetry = Pmcn

| unit cell =

| color = Light yellow, orange-yellow, yellow-brown, grey

| colour =

| habit =

| twinning =

| cleavage = None

| fracture = Splintery

| tenacity = Brittle

| mohs = 4–4.5

| luster = Dull

| streak = White

| diaphaneity = Translucent

| gravity =

| density = 3.95 g/cm³

| polish =

| opticalprop =

| refractive =

| birefringence =

| pleochroism =

| 2V =

| dispersion =

| extinction =

| length fast/slow =

| fluorescence =

| absorption =

| melt =

| fusibility =

| diagnostic =

| solubility =

| impurities =

| alteration =

| other =

| prop1 =

| prop1text =

| references =

}}

Ancylite is a group of hydrous strontium carbonate minerals containing cerium, lanthanum and minor amounts of other rare-earth elements. The chemical formula is {{chem2|Sr(Ce,La)(CO3)2(OH)*H2O}} with ancylite-Ce enriched in cerium and ancylite-La in lanthanum.http://webmineral.com/data/Ancylite-(Ce).shtml Webmineral data Ancylite-Ce.http://www.handbookofmineralogy.org/pdfs/ancylitela.pdf{{dead link|date=October 2016 |bot=InternetArchiveBot |fix-attempted=yes }} Handbook of Mineralogy.

Ancylite was first described in 1899 for an occurrence in the Narsarsuk pegmatite in west Greenland and named from the {{langx|grc|ἀγκύλος}} for curved in reference to its rounded or distorted crystal form.http://www.mindat.org/min-216.html Mindat.