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:

Pb₃Cl₂O₂

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:

Mendipite Crednerite

Comments: Sooty, deep-black, granular to platy crednerite with mendipite.
Location: Mendip Hills, Somerset, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Mendipite Chloroxiphite Crednerite

Comments: Green, opaque granular chloroxiphite with mendipite and black crednerite.
Location: Higher Pitts Farm, Priddy, Mendip Hills, Somerset, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Mendipite Crednerite Chloroxiphite

Comments: Radiating compact with clear to white crystalline mendipite with black crednerite and green chloroxiphite.
Location: Mendip Hills, Somerset, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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 - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 3.09(1), 2.78(0.7), 3.04(0.7),

Crystal Structure:

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Krivovichev S V , Burns P C , European Journal of Mineralogy , 13 (2001) p.801-809, Crystal chemistry of lead oxide chlorides. I. Crystal structures of, synthetic mendipite, Pb3O2Cl2, and synthetic damaraite, Pb3O2(OH)Cl

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:

PE_Mendipite=1,612.60 barns/electron
U=PE_Mendipite x rElectron 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 2₁2₁2₁ 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 2₁2₁2₁ 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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Ask about Mendipite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: