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Crystal System:
Named in honor of the American mineral dealer and collector Bryan K. Lees (born 1957)

The second purely K-U oxide/hydroxide mineral after compreignacite.

A synthetic Na analogue is known.

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Classification of LeesiteHide

Approval Year:

Chemical Properties of LeesiteHide

IMA Formula:
K(H2O)2[(UO2)4O2(OH)5] · 3H2O

Crystallography of LeesiteHide

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cell Parameters:
a = 14.866(7) Å, b = 14.126(7) Å, c = 16.772(8) Å
a:b:c = 1.052 : 1 : 1.187
Unit Cell V:
3,522.07 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:

Type Occurrence of LeesiteHide

Place of Conservation of Type Material:
Cotypes: mineralogical collections of (1) the Natural History Museum of Los Angeles County, Los Angeles, USA (catalogue numbers 66285, 66286 and 66287), and (2) the New Mexico Bureau of Geology and Mineral Resources Socorro, USA (catalogue number 19029)

Synonyms of LeesiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for LeesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Olds, T.A., Haynes, P., Kampf, A. R., Spano, T., Plášil, J., Carlson, S.M., Burns, P.C., Simonetti, A., Mills, O.P. (2016): Leesite, IMA 2016-064. CNMNC Newsletter No. 34, December 2016, page 1316; Mineralogical Magazine: 80: 1315–1321
Olds. T.A., Plášil, J., Kampf, A.R., Spano, T., Haynes, P., Carlson, S.M., Burns, P.C., Simonetti, A., Mills, O.P. (2018): Leesite, K(H2O)2[(UO2)4O2(OH)5]∙3H2O, a new K-bearing schoepite-family mineral from the Jomac mine, San Juan County, Utah, U.S.A. American Mineralogist, 103, 143–150.

Internet Links for LeesiteHide

Localities for LeesiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Utah
    • San Juan Co.
      • White Canyon District
        • White Canyon
Olds, T.A., Haynes, P., Kampf, A. R., Spano, T., Plášil, J., Carlson, S.M., Burns, P. C., Simonetti, A. and Mills, O.P. (2016) Leesite, IMA 2016-064. CNMNC Newsletter No. 34, December 2016, page 1316; Mineralogical Magazine, 80, 1315–1321
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