pecoraite

{{Short description|Nickel phyllosilicate mineral of the serpentine group}}

{{Infobox mineral

| name = Pecoraite

| category = Silicate mineral

| boxwidth =

| image = Pecoraite, Eden Vermont.jpg

| caption = Pecoraite from Eden, Vermont

| formula = {{chem2|Ni3(Si2O5)(OH)4}}

| IMAsymbol = Pco{{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 = 9.ED.15

| system = Monoclinic
Unknown space group

| class =

| symmetry =

| color = Green, blue-green yellow-green

| mohs = 2.5–3

| luster = Waxy, earthy

| streak = Pale green

| gravity = 3.084

}}

Pecoraite is a nickel silicate mineral and a member of the serpentine group. It was named after geologist William Thomas Pecora. It is monoclinic and has a chemical composition of {{chem2|Ni3(Si2O5)(OH)4}}. It is associated with the weathering-and-or oxidation of meteorites or nickel sulfide minerals such as millerite. It is also found in altered ultramafic rocks.{{cite web|title=Mineralogy Database|url=http://www.mindat.org/min-3139.html|work=Mindat|accessdate=2013-03-21}} Pecoraite is typically a green, lime green, or bluegreen mineral with a waxy, or earthy luster and a mohs hardness of 2.5.{{cite web|title=Webmineral|url=http://webmineral.com/data/Pecoraite.shtml|accessdate=2013-03-21}} Common textural habits associated with pecoraite are curved plates, spirals and tubes. It can also be granular and massive.