Mendipite Mineral Data
General Mendipite Information
Chemical Formula:
Pb3Cl2O2
Composition:
Molecular Weight = 724.50 gm
Lead 85.80 % Pb 92.42 % PbO
Chlorine 9.79 % Cl 9.79 % Cl
- %
Cl -2.21 % -O=Cl2
Oxygen 4.42 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Pb3 Cl2 O2
IMA Status:
Valid Species (Pre-IMA) 1839
Locality:
Mendip Hills, Somersetshire, England. Link to MinDat.org Location Data.
Name Origin:
Named after its locality.
Name Pronunciation:
Mendipite + Pronunciation
Synonym:
ICSD 23521
PDF 25-448
Mendipite Image
Images:
Images:
Images:
Mendipite Crystallography
Axial Ratios:
a:b:c =0.7966:1:0.4912
Cell Dimensions:
a = 9.52, b = 11.95, c = 5.87, Z = 4; V = 667.79 Den(Calc)= 7.21
Crystal System:
Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 21 21 21
X Ray Diffraction:
By Intensity(I/Io ): 3.09(1), 2.78(0.7), 3.04(0.7),
Physical Properties of Mendipite
Cleavage:
{010} Distinct, {100} Distinct
Color:
Colorless, White, Gray, Yellowish, Bluish.
Density:
7 - 7.2, Average = 7.1
Diaphaneity:
Translucent
Fracture:
Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Habit:
Columnar - Forms columns
Habit:
Fibrous - Crystals made up of fibers.
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Hardness:
2.5-3 - Finger Nail-Calcite
Luster:
Adamantine - Pearly
Streak:
white
Optical Properties of Mendipite
Gladstone-Dale:
CI meas = -0.166 (Poor) - where the CI = (1-KPDmeas /KC ) CI calc = -0.148 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1766,KPDmeas = 0.1793,KC = 0.1538 Ncalc = 2.08 - 2.11
Optical Data:
Biaxial (+/-), a=2.24, b=2.27, g=2.31, bire=0.0700, 2V(Calc)=84, 2V(Meas)=90.
Calculated Properties of Mendipite
Electron Density:
Bulk Density (Electron Density)=5.89 gm/cc note: Specific Gravity of Mendipite =7.21 gm/cc.
Fermion Index:
Fermion Index = 0.18 Boson Index = 0.82
Photoelectric:
PEMendipite =1,612.60 barns/electronU=PEMendipite x r Electron Density=9,500.44 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Mendipite is Not Radioactive
Mendipite Classification
Dana Class:
10.03.01.01 (10) Oxyhalides and Hydroxyhalides
(10.03) where (A)3 (O,OH)2 Xq
(10.03.01) Dana Group
10.03.01.01 Mendipite Pb3Cl2O2 P 21 21 21 2 2 2
Strunz Class:
03.DC.70 03 - HALIDES
03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
03.DC -With Pb (As,Sb,Bi), without Cu
03.DC.70 Mendipite Pb3Cl2O2 P 21 21 21 2 2 2
Other Mendipite Information
References:
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
See Also:
Links to other databases for Mendipite :
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 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Mendipite Specimen Label here :
Mendipite
Pb3Cl2O2
Dana No: 10.03.01.01 Strunz No: 03.DC.70
Locality:
Notes:
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