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:

Pb₇O₆Cl₂

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

Comments: Orange crystalline lorettoite in matrix.
Location: Kombat Mine, Kombat, Otjozondjuba, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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:

OrthorhombicSpace Group: pseudo-TET

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_Lorettoite=1,697.37 barns/electron
U=PE_Lorettoite x rElectron 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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Ask about Lorettoite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Print or Cut-and-Paste your Lorettoite Specimen Label here :

Lorettoite

Pb7O6Cl2
Dana No: 10.05.12.01 Strunz No: 03.XX.00
Locality:

Notes: