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General Mimetite Information
Help on Chemical Formula: Chemical Formula: Pb5(AsO4)3Cl
Help on Composition: Composition: Molecular Weight = 1,488.21 gm
   Arsenic   15.10 %  As   23.17 % As2O5
   Lead      69.61 %  Pb   74.99 % PbO
   Chlorine   2.38 %  Cl    2.38 % Cl
               -   %  Cl   -0.54 % -O=Cl2
   Oxygen    12.90 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb5(AsO4)3Cl
Help on Environment: Environment: Secondary mineral in lead ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1835
Help on Locality: Locality: Treue Freundschaft Mine, Johanngeorgenstadt, Erzgebirge, Saxony, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek mimethes - "imitator" , because of its resemblance to pyromorphite.
Help on Synonym: Synonym: Arsenopyromorphite
  Campylite
  ICSD 64826
  Mimetesite
  PDF 19-683
  Prixite
 

Mimetite Image

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Mimetite   Duftite-alpha

Comments: Mimetite crystals are replaced by Duftite-alpha on a gossanous matrix.
Location: Mt. Bonnie Mine, Northern Territory, Australia. Scale: Crystal size to 3mm.
© John Veevaert
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Mimetite   Cerussite

Comments: Creamy white crystal of cerussite measuring 11 x 22 mm in size nestled nicely in a vug which is lined by bright-yellow, lustrous, prismatic mimetite crystals. The mimetites average 5 mm in length.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: 3.5 x 4.5 x 2.5 cm.
© Dan Weinrich
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Mimetite

Comments: Crystals of tan colored Mimetite. The largest crystal is 1 cm across.
Location: Mt. Bonnie Mine, Northen Territory, Austalia. Scale: 2.9 x 1.7 cm.
© John Veevaert
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Mimetite   Plumbogummite

Comments: White, fuzzy aggregates of plumbogummite covering lime green mimetite (campylite) crystals.
Location: Caldbeck Fells, Cumbria, England. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals
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Mimetite   Wulfenite

Comments: Gemmy, pale yellow mimetite crystal with brownish-orange wulfenite. Former James and Dawn Minette Collection.
Location: Gem Pocket 1971, Tsumeb, Namibia. Scale: 2 x 1 x 1 cm.
© Rob Lavinsky

Mimetite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.71128
Help on Cell Dimensions: Cell Dimensions: a = 10.46, c = 7.44, Z = 2; V = 704.96 Den(Calc)= 7.01
Help on Crystal System: Crystal System: Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 63/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.06(1), 3.01(0.95), 2.96(0.65),
Help on Forms: Forms:

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Forms: [ 1 1 1] [ 1 0 1] [ 0 1 0] [ 0 0 1]

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Yongshan D , Hughes J M , Moore P B , The Canadian Mineralogist , 29 (1991) p.369-376, The crystal structures of mimetite and clinomimetite, Pb5(AsO4)3Cl, Locality: Durango, Mexico

 

Physical Properties of Mimetite

Help on Cleavage: Cleavage: [1011] Imperfect
Help on Color: Color: White, Yellow, Orange, Brown, Red.
Help on Density: Density: 7.1 - 7.24, Average = 7.17
Help on Diaphaniety: Diaphaniety: Subtransparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Adamantine - Resinous
Help on Streak: Streak: white
 

Optical Properties of Mimetite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.095 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.12 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1621,KPDmeas= 0.1585,KC= 0.1448
Help on Optical Data: Optical Data: Uniaxial (-), e=2.129, w=2.144, bire=0.0150.
 

Calculated Properties of Mimetite

Help on Electron Density: Electron Density:

relectron=5.99 gm/cc
note: rMimetite =7.17 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.1539
Boson Index = 0.8461
Help on Photoelectric: Photoelectric:

PEMimetite =1,290.30 barns/electron
U=PEMimetite x relectron=7,733.29 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mimetite is Not Radioactive
 

Mimetite Classification
Help on Dana Class: Dana Class: 41.8.4.2 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.8)where (A)5 (XO4)3 Zq
  (41.8.4)Dana Group
 
41.8.4.1 Pyromorphite Pb5(PO4)3Cl P 63/m 6/m
 
41.8.4.2 Mimetite Pb5(AsO4)3Cl P 63/m 6/m
 
41.8.4.3 Vanadinite Pb5(VO4)3Cl P 63/m 6/m
Help on Strunz Class: Strunz Class: VII/B.39-160 VII - Phosphates, Arsenates and Vanadates
  VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb
  VII/B.39 - Apatite - Pyromorphite group
 
VII/B.39-10 Fluorapatite Ca5(PO4)3F P 63/m 6/m
 
VII/B.39-20 Chlorapatite Ca5(PO4)3Cl P 63/m 6/m
 
VII/B.39-30 Hydroxylapatite Ca5(PO4)3(OH) P 63/m 6/m
 
VII/B.39-40 Carbonate-hydroxylapatite Ca5(PO4,CO3)3(OH) P 63/m 6/m
 
VII/B.39-50 Carbonate-fluorapatite Ca5(PO4,CO3)3F P 63/m 6/m
 
VII/B.39-60 Svabite Ca5(AsO4)3F P 63/m 6/m
 
VII/B.39-70 Turneaureite Ca5[(As,P)O4]3Cl P 63/m 6/m
 
VII/B.39-80 Johnbaumite Ca5(AsO4)3(OH) P 63/m,P 63 Hex
 
VII/B.39-90 Fermorite (Ca,Sr)5(AsO4,PO4)3(OH) P 63/m 6/m
 
VII/B.39-95 Fluorcaphite! (Ca,Sr,Ce,Na)5(PO4)3F P 63 6
 
VII/B.39-100 Strontium-apatite (Sr,Ca)5(PO4)3(F,OH) P 63/m 6/m
 
VII/B.39-110 Belovite-(Ce) (Sr,Ce,Na,Ca)5(PO4)3(OH) P 3 3
 
VII/B.39-115 Belovite-(La)! (Sr,La,Ce,Ca)5(PO4)3(F,OH) P 3 3
 
VII/B.39-117 Kuannersuite-(Ce)! Ba6Na2REE2(PO4)6FCl P 3 3
 
VII/B.39-120 Alforsite Ba5(PO4)3Cl P 63/m 6/m
 
VII/B.39-130 Morelandite (Ba,Ca,Pb)5(AsO4,PO4)3Cl P 63/m,P 63 Hex
 
VII/B.39-140 Hedyphane Ca2Pb3(AsO4)3Cl P 63/m 6/m
 
VII/B.39-150 Pyromorphite Pb5(PO4)3Cl P 63/m 6/m
 
VII/B.39-160 Mimetite Pb5(AsO4)3Cl P 63/m 6/m
 
VII/B.39-165 Clinomimetite Pb5(AsO4)3Cl P 21/b 2/m
 
VII/B.39-170 Vanadinite Pb5(VO4)3Cl P 63/m 6/m
 

Other Mimetite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)
Help on See Also: See Also: Links to other databases for Mimetite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - Crocoite.com Mineral Locations 8 - EUROmin Project 9 - Franklin Minerals(Dunn) 10 - Glendale Community College 11 -Google Images 12 -Google Scholar 13 -Handbook of Mineralogy (UofA) 14 - HyperPhysics 15 -MinDAT 16 -MinMax(Deutsch) 17 -MinMax(English) 18 - Mineral and Gemstone Kingdom 19 -Mineralienatlas (Deutsch) 20 - Philatelic Mineralogy 21 -QUT Mineral Atlas 22 - WWW-MINCRYST 23 - YupRocks 24 -theimage 25 -École des Mines de Paris

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Mimetite

Pb5(AsO4)3Cl
Dana No: 41.8.4.2 Strunz No: VII/B.39-160
Locality:

 

Notes:

 
 
   
 
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