Mimetite Mineral Data

Mimetite Mineral Data +

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General Mimetite Information

Chemical Formula:

Pb5(AsO4)3Cl

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

Empirical Formula:

Pb₅(AsO₄)₃Cl

Environment:

Secondary mineral in lead ores.

IMA Status:

Valid Species (Pre-IMA) 1835

Locality:

Treue Freundschaft Mine, Johanngeorgenstadt, Erzgebirge, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

From the Greek mimethes - "imitator" , because of its resemblance to pyromorphite.

Synonym:

Arsenopyromorphite

Campylite

ICSD 64826

Mimetesite

PDF 19-683

Prixite

Mimetite Image

Images:

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

Images:

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

Images:

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

Images:

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

Images:

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

Axial Ratios:

a:c = 1:0.71128

Cell Dimensions:

a = 10.46, c = 7.44, Z = 2; V = 704.96 Den(Calc)= 7.01

Crystal System:

Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 6₃/m

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

By Intensity(I/I_o): 3.06(1), 3.01(0.95), 2.96(0.65),

Forms:

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

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Crystal Structure:

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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

Cleavage:

[1011] Imperfect

Color:

White, Yellow, Orange, Brown, Red.

Density:

7.1 - 7.24, Average = 7.17

Diaphaniety:

Subtransparent to translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

3.5-4 - Copper Penny-Fluorite

Luminescence:

None.

Luster:

Adamantine - Resinous

Streak:

white

Optical Properties of Mimetite

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

Optical Data:

Uniaxial (-), e=2.129, w=2.144, bire=0.0150.

Calculated Properties of Mimetite

Electron Density:

r_electron=5.99 gm/cc
note: r_Mimetite=7.17 gm/cc.

Fermion Index

Fermion Index = 0.1539
Boson Index = 0.8461

Photoelectric:

PE_Mimetite=1,290.30 barns/electron
U=PE_Mimetite x r_electron=7,733.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mimetite is Not Radioactive

Mimetite Classification

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

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

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)

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 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - Franklin Minerals(Dunn)
9 - Glendale Community College
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
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 - Ruff.Info
23 - WWW-MINCRYST
24 - YupRocks
25 - theimage

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

Mimetite

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

Notes: