Doyleite

Doyleite
General
CategoryMineral
Formula
(repeating unit)
Al(OH)3
IMA symbolDoy[1]
Strunz classification4.FE.10
Dana classification6.3.4.1
Crystal systemTriclinic
Space groupP1 or P1
Unit cell104.37
Identification
Formula mass78
ColorWhite, creamy-white, bluish-white
CleavagePerfect on {010}
Distinct on {100}
Mohs scale hardness2.5 - 3
LusterVitreous
StreakWhite
Optical propertiesBiaxial (+)
Refractive indexnα = 1.545
nβ = 1.553
nγ = 1.566
Birefringence0.021
2V angleMeasured: 77°
Calculated: 78°
DispersionNone

Doyleite is a rare aluminum trihydroxide mineral named in honor of its discoverer, the Canadian physician Earl Joseph (Jess) Doyle. It was first definitively described in 1985 (although a partial description was published in 1979)[2] and it is approved by the IMA.[3] It was described from Mont Saint-Hilaire, where it is extremely rare.[4]

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Joseph Anthony, Mandarino; Violet, Anderson (31 March 1989). Monteregian Treasures: The Minerals of Mont Saint-Hilaire, Quebec. CUP Archive. ISBN 9780521326322.
  3. ^ "Doyleite". www.mindat.org. Retrieved 2021-10-25.
  4. ^ "Doyleite (TL)". Saint-Hilaire. Retrieved 2021-11-15.