Bayleyite Explained

Bayleyite
Category:Carbonate mineral
Formula:Mg2(UO2)(CO3)3·18(H2O)
Imasymbol:Byy[1]
Strunz:5.ED.05
System:Monoclinic
Class:Prismatic (2/m)
(same H-M symbol)
Symmetry:P21/c
Unit Cell:a = 26.65 Å, b = 15.31 Å,
c = 6.53 Å; β = 93.07°; Z = 4
Color:Sulfur yellow
Habit:Clusters of prismatic crystals, crusts
Fracture:Conchoidal
Mohs:2–2.5
Luster:Vitreous
Diaphaneity:Semitransparent
Gravity:2.05
Opticalprop:Biaxial (−)
Refractive:nα = 1.453 – 1.455 nβ = 1.490 – 1.492 nγ = 1.498 – 1.502
Birefringence:δ = 0.045 – 0.047
Pleochroism:Visible: X = Pinkish, Y = Light yellow, Z = Light yellow
2V:Measured: 30°
Fluorescence:Weak; yellow-green to pale greenish under LW and SW
Other: Radioactive
References:[2] [3] [4]

Bayleyite is a uranium carbonate mineral with the chemical formula: Mg2(UO2)(CO3)3·18(H2O). It is a secondary mineral which contains magnesium, uranium and carbon. It is a bright yellow color. Its crystal habit is acicular but is more commonly found as crusts on uranium bearing ores. It has a Mohs hardness of about 2–2.5.[2]

Occurrence

It was first described in 1948 for an occurrence in the Hillside mine, north of Bagdad, Yavapai County, Arizona and named for mineralogist William Shirley Bayley (1861–1943) of the University of Illinois. It occurs as an efflorescence or coating on other secondary minerals and often is deposited on mine walls and workings. It occurs with schrockingerite, andersonite, swartzite and gypsum in the Hillside mine; with schrockingerite and gypsum in the Hideout mine in Utah; and with tyuyamunite, uranophane, liebigite and carnotite in the Powder River Basin in Wyoming.[4]

Notes and References

  1. Warr. L.N.. 2021. IMA–CNMNC approved mineral symbols. Mineralogical Magazine. 85. 3. 291–320. 10.1180/mgm.2021.43. 2021MinM...85..291W. 235729616. free.
  2. http://www.mindat.org/min-582.html Bayleyite on Mindat.org
  3. http://www.webmineral.com/data/Bayleyite.shtml Bayleyite on Webmineral
  4. http://rruff.geo.arizona.edu/doclib/hom/bayleyite.pdf Handbook of Mineralogy