Lorettoite Mineral Data
General Lorettoite Information
Chemical Formula:
Pb7O6Cl2
Composition:
Molecular Weight = 1,617.30 gm
Lead 89.68 % Pb 96.61 % PbO
Chlorine 4.38 % Cl 4.38 % Cl
- %
Cl -0.99 % -O=Cl2
Oxygen 5.94 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Pb7 O6 Cl2
Environment:
Oxidized lead ores associated with ancient lead slags. Shown to be a man made equivalent of cubutite at the type locality.
IMA Status:
Discredited IMA 1979
Locality:
Loretto, Tennessee, USA. Laurium, Greece. Chubut, Argentina. Link to MinDat.org Location Data.
Name Origin:
Named in 1916 for its original locality.
Lorettoite Image
Images:
Lorettoite Crystallography
Axial Ratios:
a:b:c =0.2397:1:0.2401
Cell Dimensions:
a = 5.49, b = 22.9, c = 5.5, Z = 2; V = 691.47 Den(Calc)= 7.77
Crystal System:
Orthorhombic Space Group: pseudo-TET
X Ray Diffraction:
By Intensity(I/Io ): 2.98(1), 2.77(0.8), 1.642(0.7), 1.993(0.7), 2.25(0.6), 2.31(0.6), 3.49(0.6), 3.86(0.6),
Physical Properties of Lorettoite
Cleavage:
{001} Perfect
Color:
Honey yellow, Reddish yellow.
Density:
7.6 - 7.77, Average = 7.68
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Adamantine
Magnetism:
Nonmagnetic
Optical Properties of Lorettoite
Gladstone-Dale:
CI meas = -0.248 (Poor) - where the CI = (1-KPDmeas /KC ) CI calc = -0.234 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1757,KPDmeas = 0.1776,KC = 0.1423 Ncalc = 2.08 - 2.11
Optical Data:
Uniaxial (-), e=2.33, w=2.4, bire=0.0700.
Calculated Properties of Lorettoite
Electron Density:
Bulk Density (Electron Density)=6.30 gm/cc note: Specific Gravity of Lorettoite =7.77 gm/cc.
Fermion Index:
Fermion Index = 0.19 Boson Index = 0.81
Photoelectric:
PELorettoite =1,697.37 barns/electronU=PELorettoite x r Electron Density=10698.90 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Lorettoite is Not Radioactive
Lorettoite Classification
Dana Class:
10.05.12.01 (10) Oxyhalides and Hydroxyhalides
(10.05) where Am (O,OH)p Xq
(10.05.12) Dana Group
10.05.12.01 Lorettoite ? Pb7O6Cl2 pseudo-TET Ortho
Strunz Class:
03.XX.00 03 - Halogenides
03.X - Unclassified Strunz Halogenides
03.XX -Oxyhalide
03.XX.00 Hydrophilite ? CaCl2 Pnnm 2/m 2/m 2/m
03.XX.00 Hydromolysite ? FeCl3•6(H2O) C 2/m 2/m
03.XX.00 Lorettoite ? Pb7O6Cl2 pseudo-TET Ortho
03.XX.00 Yttrocerite * CaF2(Y,Ce)F3 Unk Cubic
03.XX.00 IMA2009-014 SrF2 F m3m 4/m 3 2/m
03.XX.00 IMA2009-015 NaSrCeF6 P 63 /m 6/m
Other Lorettoite Information
References:
NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Dana)
See Also:
Links to other databases for Lorettoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
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Lorettoite
Pb7O6Cl2
Dana No: 10.05.12.01 Strunz No: 03.XX.00
Locality:
Notes:
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