Aeschynite-(Ce)

{{short description|Oxide mineral}}

{{Infobox mineral

| name = Aeschynite-(Ce)

| image =

| alt =

| caption =

| category = Oxide minerals

| formula = {{chem2|(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6}}

|IMAsymbol=Aes-Ce{{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}}

| strunz = 4.DF.05

| dana = 08.03.06.01

| system = Orthorhombic
Dipyramidal class

| symmetry = H-M symbol: (2/m 2/m 2/m)
Space group: Pmnb

| unit cell = a = 11.08, b = 7.56
c = 5.37 [Å]; Z = 4

| molweight = 305.70 g/mol

| color = Brown, light brown, brownish black, yellow, black

| colour =

| habit = Acicular, massive

| twinning =

| cleavage = None

| fracture = Brittle - conchoidal

| tenacity = Brittle

| mohs = 5 - 6

| luster = Adamantine, resinous to waxy, sub-metallic; dull when altered

| streak = Nearly black to brown

| diaphaneity = Transparent to translucent

| gravity = 4.52

| density = 5.19

| polish =

| opticalprop = Isotropic when metamict

| refractive = 2.26

| birefringence =

| pleochroism =

| 2V =

| dispersion =

| extinction =

| length fast/slow =

| fluorescence =

| absorption =

| melt =

| fusibility =

| diagnostic =

| solubility =

| impurities =

| alteration =

| other = 25px Radioactive

| prop1 =

| prop1text =

| references = {{cite web|title=Aeschynite-(Ce) Mineral Data|url=http://www.webmineral.com/data/Aeschynite-%28Ce%29.shtml|publisher=webmineral.com|accessdate=2011-10-18}}{{cite web|title=Aeschynite-(Ce): Aeschynite-(Ce) mineral information and data|url=http://www.mindat.org/min-37.html|publisher=mindat.org|accessdate=2011-10-18}}{{cite web|title=Aeschynite-(Ce)|url=http://database.iem.ac.ru/mincryst/s_carta.php?AESCHYNITE-%28Ce%29+34|accessdate=2011-10-18}}{{cite web|title=Aeschynite-(Ce) (Ce, Ca, Fe, Th)(Ti,Nb)2(O, OH)6|url=http://rruff.geo.arizona.edu/doclib/hom/aeschynitece.pdf|accessdate=2011-10-18}}{{cite web|title=Aeschynite-(Ce) |url=http://www.mineralatlas.com/mineral%20optical%20descriptions/A/aeschyniteceopt.htm |publisher=mineralatlas.com |accessdate=2011-10-18 |url-status=usurped |archiveurl=https://web.archive.org/web/20120424021424/http://www.mineralatlas.com/mineral%20optical%20descriptions/A/aeschyniteceopt.htm |archivedate=2012-04-24 }}

}}

Aeschynite-(Ce) (or Aschynite, Eschinite, Eschynite) is a rare earth mineral of cerium, calcium, iron, thorium, titanium, niobium, oxygen, and hydrogen with chemical formula {{chem2|(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6}}. Its name comes from the Greek word αισχύνη ("aeschyne") for "shame" because early chemists had difficulty with separations of titanium from zirconium.{{cite web|title=Aeschynite-(Ce): Aeschynite-(Ce) mineral information and data|url=http://www.mindat.org/min-37.html|publisher=mindat.org|accessdate=2018-11-18}}

The "-(Ce)" means it has more cerium than the yttrium variety aeschynite-(Y). Its Mohs scale rating is 5–6.