Mendipite Mineral Data

Mendipite Mineral Data +

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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.

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

Diaphaniety:

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

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:

r_electron=5.89 gm/cc
note: r_Mendipite=7.21 gm/cc.

Fermion Index

Fermion Index = 0.18963
Boson Index = 0.81037

Photoelectric:

PE_Mendipite=1,612.60 barns/electron
U=PE_Mendipite x r_electron=9,500.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mendipite is Not Radioactive

Mendipite Classification

Dana Class:

10.3.1.1 (10)Oxyhalides and Hydroxyhalides

(10.3)where (A)3 (O,OH)2 Xq

(10.3.1)Dana Group

10.3.1.1 Mendipite Pb3Cl2O2 P 2₁2₁2₁ 2 2 2

Strunz Class:

III/D.11-10 III - Halogenides

III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds

III/D.11 - Mendipite - Onoratoite series

III/D.11-10 Mendipite Pb3Cl2O2 P 2₁2₁2₁ 2 2 2

III/D.11-15 Damaraite Pb3O2(OH)Cl Pmc2 mm2

III/D.11-17 Chubutite* Pb7O6Cl2 Unk Ortho

III/D.11-20 Penfieldite Pb2Cl3(OH) P 6/mmm 6/m 2/m 2/m

III/D.11-30 Blixite Pb2Cl(O,OH)2 Unk Ortho

III/D.11-35 Mereheadite! Pb2O(OH)Cl C 2/c 2/m

III/D.11-40 Sundiusite Pb10(SO4)Cl2O8 C 2,Cm,C 2/m Mono

III/D.11-50 Asisite Pb12(SiO4)O8Cl4 I 4/mmm 4/m 2/m 2/m

III/D.11-55 Parkinsonite (Pb,Mo,[])8O8Cl2 I 4/mmm 4/m 2/m 2/m

III/D.11-60 Thorikosite Pb3(Sb,As)O3(OH)Cl2 I 4/mmm 4/m 2/m 2/m

III/D.11-65 Philolithite! Pb12O6Mn(Mg,Mn)2(Mn,Mg)4(SO4)(CO3)4Cl4(OH)12 P 4₁/nnm 4/m 2/m 2/m

III/D.11-70 Pinalite Pb3(WO4)OCl2 Amam 2/m 2/m 2/m

III/D.11-80 Nadorite PbSbO2Cl Bmmb 2/m 2/m 2/m

III/D.11-90 Perite PbBiO2Cl Bmmb 2/m 2/m 2/m

III/D.11-100 Heliophyllite Pb6As2O7Cl4 Unk Ortho

III/D.11-110 Ecdemite Pb6As2O7Cl4 Unk Tetra

III/D.11-120 Onoratoite Sb8O11Cl2 C 2/m 2/m

Other Mendipite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Print or Cut-and-Paste your Mendipite Specimen Label here :

Mendipite

Pb3Cl2O2
Dana No: 10.3.1.1 Strunz No: III/D.11-10
Locality:

Notes: