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Honey-yellow, yellow, reddish yellow
2½ - 3
Specific Gravity:
7.39 - 7.95
Crystal System:
After the locality of Loretto, Tennessee, USA.
Shown to be man-made material (White, 1979). Subsequently identified to occur in additional locations.
Can be confused with asisite.
See also chubutite (now considered a synonym of lorettoite) and Unnamed (Pb Oxide-Chloride).

Originally reported from both Loretto, Lawrence Co., Tennessee, USA and
Pick's Delta Mine (Delta Mine; Pick's Mine), Delta, San Rafael District (San Rafael Swell), Emery Co., Utah, USA.

Classification of Lorettoite


5 : Am(O,OH)pXq

Physical Properties of Lorettoite

Honey-yellow, yellow, reddish yellow
2½ - 3 on Mohs scale
7.39 - 7.95 g/cm3 (Measured)    

Optical Data of Lorettoite

Uniaxial (-)
RI values:
nω = 2.400 nε = 2.330
Max Birefringence:
δ = 0.070
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of Lorettoite


Crystallography of Lorettoite

Crystal System:

Synonyms of Lorettoite

Other Language Names for Lorettoite

Other Information

Soluble in hot dilute nitric acid. Dissolves more slowly in HCl and H2SO4. Not appreciably soluble in water.
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 Lorettoite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Wells and Larsen (1916) Journal of the Washington Academy of Science: 6: 669.
Corti (1918) Anales soc. quim. argentina: 6: 65 (as Chubutite).
Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 56.
White, J. S. (1979): Lorettoite discredited and chubutite reviewed. Am. Mineral. 64, 1303-1305.
Lapis (1986): 11: 25.
Edwards, R., Gillard, R. D., Williams, P. A., and Pollard, A. M. (1992): Studies of secondary mineral formation in the PbO-H2O-HCl system. Mineral. Mag. 56, 53-65.

Internet Links for Lorettoite URL:
Please feel free to link to this page.

Localities for Lorettoite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
  • Chubut
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 56.
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian, Laurion: The Minerals in the Ancient Slags; Schnorrer-Köhler, G. (1986): Neufunde in den Schlacken von Laurion. Lapis, 11 (6), 25-29; 42.
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
Red asisite from the Kombat Mine has been erroneously sold as "chubutite" or "lorettoite".
  • Tennessee
    • Lawrence Co.
Palache et al (1944), Dana's System of Mineralogy, 7th. ed., vol. II: 56.
  • Utah
    • Emery Co.
      • San Rafael District (San Rafael Swell)
        • Delta
[Clark, 1993 - "Hey's Mineral Index", p407]
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