Hellenica World

Wavellite

Wavellite. Collected by John Rice, August, 1987, from Montgomery County, Arkansas. Mineral collection of Bringham Young University Department of Geology, Provo, Utah. Photograph by Andrew Silver. BYU index 9-3038a, Al3(PO4)2(OH,F)3·5H2O. United States Geological Survey

Wavellite
Wavellite from Poland
General
Category Phosphate mineral
Chemical formula Al3(PO4)2(OH,F)3·5H2O
Identification
Color Green to yellowish-green and yellow, brown, white and colorless
Crystal habit spherical, radial aggregates; striated prisms; crusty to stalactitic
Crystal system Orthorhombic - Dipyramidal
Cleavage [110] Perfect, [101] Good
Fracture Fibrous
Mohs Scale hardness 3.5 - 4
Luster Vitreous to resinous, pearly.
Refractive index nα = 1.518 - 1.535 nβ = 1.524 - 1.543 nγ = 1.544 - 1.561
Optical Properties Biaxial (+)
Birefringence δ = 0.026
Pleochroism Weak
Streak White
Specific gravity 2.3 - 2.4
Diaphaneity Translucent
References [1][2][3]

Wavellite is a phosphate mineral, normally translucent green. It is found in fractures in aluminous metamorphic rock, in hydrothermal regions and in phosphate rock deposits.

Named after William Wavell (?-1829) of England who discovered the mineral in a quarry in Devon, England in 1805. It is found in a wide variety of locations notably in the Mount Ida, Arkansas area in the Ouachita Mountains.

Hydrated aluminium phosphate has the chemical formula:

Al3(PO4)2(OH,F)3·5H2O

See also

* List of minerals

References

  1. ^ http://rruff.geo.arizona.edu/doclib/hom/wavellite.pdf Mineral Handbook
  2. ^ http://webmineral.com/data/Wavellite.shtml Webmineral
  3. ^ http://www.mindat.org/min-4250.html Mindat


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