Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Lorettoite

This page is currently not sponsored. Click here to sponsor this page.
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.





Classification of Lorettoite

Discredited
10.5.12.1

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

Physical Properties of Lorettoite

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 Lorettoite

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 Lorettoite

Formula:
Pb7O6Cl2

Crystallography of Lorettoite

Crystal System:
Orthorhombic

Synonyms of Lorettoite

Other Language Names for Lorettoite

Other Information

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 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

mindat.org URL:
https://www.mindat.org/min-2437.html
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.
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  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2017, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: July 26, 2017 23:46:13 Page generated: July 26, 2017 03:09:41
Go to top of page