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Pegmatite with Petalite

UNB-2020-0285Minerals » Silicates » Phyllosilicates

Description

Large sample from a pegmatite with tabular prismatic white Petalie crystals. Petalite (LiAlSi4O10) can be colourless, grey, yellow, pink to white. Lustre is vitreous and pearly on the cleavage and streak is colourless. Hardness is 6 to 6 1/2 and cleavage is perfect in one direction Petalite usually occurs as tabular prismatic crystals or columnar masses.

Specifications

Object namePegmatite with Petalite
IDUNB-2020-0285
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
OriginOntario, Canada
Pieces1
PartialNo
Measurements
  • 6.9cm x 10.4cm x 8.4cm

Map of Origin