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Lorettoite

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Formula:
Pb7O6Cl2
Colour:
Honey-yellow, yellow, reddish yellow
Lustre:
Adamantine
Hardness:
2½ - 3
Specific Gravity:
7.39 - 7.95
Crystal System:
Orthorhombic
Name:
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.





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Classification of LorettoiteHide

Discredited
10.5.12.1

10 : OXYHALIDES AND HYDROXYHALIDES
5 : Am(O,OH)pXq

Physical Properties of LorettoiteHide

Adamantine
Colour:
Honey-yellow, yellow, reddish yellow
Streak:
Yellow
Hardness:
2½ - 3 on Mohs scale
Density:
7.39 - 7.95 g/cm3 (Measured)    

Optical Data of LorettoiteHide

Type:
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 LorettoiteHide

Formula:
Pb7O6Cl2

Crystallography of LorettoiteHide

Crystal System:
Orthorhombic

Synonyms of LorettoiteHide

Other Language Names for LorettoiteHide

Other InformationHide

Notes:
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 LorettoiteHide

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 LorettoiteHide

Localities for LorettoiteHide

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.
Argentina
 
  • 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.
Greece
 
  • 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.
Namibia
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
Red asisite from the Kombat Mine has been erroneously sold as "chubutite" or "lorettoite".
USA
 
  • 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]
Mineral and/or Locality  
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