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Epidote

UNB-2016-0517Minerals » Silicates

Description

Sample with granular green Epidote. Epidote (Ca2Al2FeOSiO4Si2O7(OH)) can be yellowish green or brownish black mineral. Lustre is vitreous and streak is colourless to grey. Hardness is 6 to 7 and cleavage is perfect in one direction, lengthwise. Epidote usually occurs as long, slender grooved prismatic crystals that are commonly terminated by two faces. Epidote can also be thick tabular crystals, massive, columnar, divergent, acicular or granular.

Specifications

Object nameEpidote
IDUNB-2016-0517
Legal statusPermanent collection
CategoryMineral
Classification
Mineral group:
Silicates
Composition
  • Ca2(Al,Fe)3(SiO4)3(OH)
  • (Al,Fe2+,Fe3+Li,Mg,Mn,Ni)5−6(Al,Fe3+,Si)4(O,OH)18
  • K(Fe,Mg)3AlSi3O10(OH)2
  • BaTiSi3O9
  • (Mg,Fe)2Al3(Si5AlO18)
  • (Ca,Fe,Mg)3Al2BO3Si4O12(OH)
  • Be3Al2(Si6O18)
  • MgSiO3
  • (Mg,Fe2+)5Al(Si3Al)O10(OH)8
  • Na2Fe2+5[Si12O30]
  • (Na,Ca)Fe3+Si2O6
  • NaFe3+Si2O6
  • NaFe3+Si2O6
  • A0-1B2C5T8O22(OH,F,Cl)2
  • (Al,Fe)SiO4
  • Various (e.g., Muscovite - KAl2(AlSi3O10)(OH)2)
  • Al2Si2O5(OH)4
  • Be3Al2(Si6O18)
  • K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
  • NaAlSi2O6
  • Mg2Si2O6
  • Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
  • Na15Ca6(Fe2+,Mn2+)3Zr3Si25O733(CO3)
  • CaMgSi2O6
  • CaFeSi2O6
  • Ca2Al3(SiO4)3(OH)
  • CaSiO3
  • Ca2(Mg,Fe2+,Fe3+,Al)5(Si,Al)8O22(OH)2
  • (Ca,Na)19(Al,Mg,Fe)13(SiO4)10(Si2O7)4(OH,F,O)10
  • Na2AlSi3O8·H2O
  • Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2
  • (Na,Ca)(Fe,Mg,Li,Al)3Al6(BO3)3(Si6O18)(OH)4
  • Ca2Al3(SiO4)3(OH)
  • LiAlSi2O6
  • MnSiO3
  • (Mn,Fe)SiO3
  • ADSi2O6
  • Ca2Al(AlSi3O10)(OH)2·H2O
  • (Ca,Na)(Mg,Fe)Si2O6
  • NaCa2Si3O8(OH)2H2O
  • LiAlSi4O10
  • NaAl2(AlSi3O10)(OH)2
  • Mg2Mg5Si8O22(OH)2
  • D3[Si2O5](OH)4
  • Mg3(Si2O5)(OH)4
  • Be₃Al₂(SiO₃)₆
  • A(D3)G6(T6O18)(BO3)3X3Z
  • (Mg,Al)8(Al,Si)6O20
  • SiO2 with variable amounts of water
  • KAl2(AlSi3O10)(F,OH)2
  • Al2(SiO4)O
OriginUnknown
Pieces1
PartialNo
Measurements
  • 4cm x 9.5cm x 6.5cm

Publications

  • Chesterman, C.W. 1979. Audubon Society, Field Guide to North American Rocks and Minerals. Knopf.