Ecdemite Mineral Data + Say ECDEMITE

T G Fine Minerals
[Newest Minerals] [Rare Minerals] [Past Sale Items] [About Us] [A-Rocks Auctions]
T G Fine Minerals sells Australian Minerals from all the classic and current localities
We are one the most comprehensive sellers of these (Aussie) minerals in the world
Broken Hill specimens are our specialty along with fine worldwide minerals, Australian opals, fossils & gems

General Ecdemite Information

Help on Chemical  Formula: Chemical Formula: Pb6As+++2O7Cl4
Help on Composition: Composition: Molecular Weight = 1,646.85 gm
   Arsenic    9.10 %  As   12.01 % As2O3
   Lead      75.49 %  Pb   81.32 % PbO
   Chlorine   8.61 %  Cl    8.61 % Cl
               -   %  Cl   -1.94 % -O=Cl2
   Oxygen     6.80 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb6As2O7Cl4
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1877
Help on Locality: Locality: Langban and Harstig mines, Varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for "unusual", in reference to the composition.
 

Search for Ecdemite Images

Click Here To Search Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

  

Ecdemite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.37222
Help on Cell Dimensions: Cell Dimensions: a = 10.8, c = 25.62, Z = 8; V = 2,988.32 Den(Calc)= 7.32
Help on Crystal System: Crystal System: TetragonalSpace Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.85(1), 2.72(0.8), 3.66(0.8),
 

Physical Properties of Ecdemite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Green yellow, Yellow, Orange.
Help on Density: Density: 6.9 - 7.1, Average = 7
Help on Diaphaniety: Diaphaniety: Translucent
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: light yellow
 

Optical Properties of Ecdemite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.122 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.073 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1755,KPDmeas= 0.1836,KC= 0.1636
Help on Optical Data: Optical Data: Uniaxial (-), e=2.25, w=2.32, bire=0.0700.
 

Calculated Properties of Ecdemite

Help on Electron Density: Electron Density:

relectron=6.06 gm/cc
note: rEcdemite =7.32 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.16686
Boson Index = 0.83314
Help on Photoelectric: Photoelectric:

PEEcdemite =1,406.90 barns/electron
U=PEEcdemite x relectron=8,529.71 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ecdemite is Not Radioactive

 

Ecdemite Classification

Help on  Dana Class: Dana Class: 46.2.1.1 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites
  (46.2)with miscellaneous formulae
  (46.2.1)Dana Group
 
46.2.1.1 Ecdemite Pb6As2O7Cl4 Unk Tetra
Help on  Strunz Class: Strunz Class: III/D.11-110 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 Ecdemite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Ecdemite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

Search for Ecdemite using:

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

Visit our Advertisers for Ecdemite :
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 Ecdemite Mineral Data :

Ask about Ecdemite 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 Ecdemite Specimen Label here :

Ecdemite

Pb6As+++2O7Cl4
Dana No: 46.2.1.1 Strunz No: III/D.11-110
Locality:

 

Notes:

 

 
   
 
Go To Webmineral Home Crystallography X-Ray D-Spacing Table Chemical Composition
Dana Classification Strunz Classification Table of Mineral Properties Alphabetical Listing of Minerals
Search Webmineral Photo Gallery of Mineral Images Help Files Links