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Chlorite

UNB-2017-0030Minerals » Silicates » Phyllosilicates

Description

Large dark green to black sample of vitreous chlorite that is tabular/foliated in appearance. Chlorite ((Mg,Fe)6(AlSi3)O10(OH)8) can be light to dark green or black in colour. Lustre varies from pearly, vitreous or dull and streak is colourless. Hardness is 2 to 2 1/2 and cleavage is perfect in one direction. Chlorite is usually found as tabular forms that are six-sided pseudohexagonal crystals but can also be foliated, scaly, granular or compact.

Specifications

Object nameChlorite
IDUNB-2017-0030
Legal statusPermanent collection
CategoryMineral
Classification
Mineral group:
Silicates
Sub-group:
Phyllosilicates
Composition
  • (Al,Fe2+,Fe3+Li,Mg,Mn,Ni)5−6(Al,Fe3+,Si)4(O,OH)18
  • K(Fe,Mg)3AlSi3O10(OH)2
  • (Mg,Fe2+)5Al(Si3Al)O10(OH)8
  • Various (e.g., Muscovite - KAl2(AlSi3O10)(OH)2)
  • Al2Si2O5(OH)4
  • K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
  • Na2AlSi3O8·H2O
  • LiAlSi4O10
  • NaAl2(AlSi3O10)(OH)2
  • D3[Si2O5](OH)4
  • Mg3(Si2O5)(OH)4
  • KAl2(AlSi3O10)(F,OH)2
OriginUnknown
Pieces1
PartialNo
Measurements
  • 1.5cm x 7cm x 6.5cm

Publications

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