Mendipite Mineral Data

Mendipite Mineral Data +

We specialise in top quality, fine minerals from Morocco, Namibia,
South Africa, Pakistan, Democratic Republic of Congo (ZaÃƒï¿½Ã‚Â¯re) and China
Worldwide Fine Minerals by B & C GOBIN

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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)

Search for Mendipite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Mendipite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Mendipite Mineral Data :

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

Notes: