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Mimetite-M

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Formula:
Pb
 
5
(AsO
 
4
)
 
3
Cl
System:MonoclinicColour:Pale greenish yellow, ...
Lustre:Sub-Adamantine, Vitreous, Sub-Vitreous, Resinous, WaxyHardness:4
Name:Originally named clinomimetite in 1991 by Yongshan Dai, John M. Hughes, and Paul Brian Moore for its monoCLINic structure and chemical identity with mimetite. Renamed by Pasero et al. (2010).
Dimorph of:Mimetite


A polymorphic variant of mimetite.

See also mimetite-2M.

Classification of Mimetite-M

IMA status:Discredited 2010
Strunz 8th edition ID:7/B.39-165
Nickel-Strunz 10th (pending) edition ID:8.BN.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
N : With only large cations, (OH, etc.):RO4 = 0.33:1
Dana 7th edition ID:41.8.6.1
Dana 8th edition ID:41.8.6.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
Hey's CIM Ref.:22.2.11

22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride
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Type Occurrence of Mimetite-M

Type Locality:Treue Freundschaft Mine, Johanngeorgenstadt, Johanngeorgenstadt District, Erzgebirge, Saxony, Germany
General Appearance of Type Material:Hexagonal prismatic crystals
Year of Discovery:1991
Geological Setting of type material:Polymetallic ore deposit.
Associated Minerals at type locality:
RomanèchiteHematite

Occurrences of Mimetite-M

Geological Setting:Polymetallic ore deposits

Physical Properties of Mimetite-M

Lustre:Sub-Adamantine, Vitreous, Sub-Vitreous, Resinous, Waxy
Diaphaneity (Transparency):Transparent, Translucent
Colour:Pale greenish yellow, white.
Streak:White
Hardness (Mohs):4
Tenacity:Brittle
Density (measured):7.36 g/cm3
Density (calculated):7.37 g/cm3

Crystallography of Mimetite-M

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b
Space Group Setting:P21/b
Cell Parameters:a = 10.189Å, b = 20.372Å, c = 7.461Å
β = 119.88°
Ratio:a:b:c = 0.5 : 1 : 0.366
Unit Cell Volume:V 1,342.82 ų (Calculated from Unit Cell)
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
3.342 (50)
3.048 (100)
3.008 (70)
2.947 (70)
2.106 (60)
1.961 (50)
1.903 (50)

Optical Data of Mimetite-M

Type:Biaxial (-)
RI values: nα = 2.129 nβ = 2.144 nγ = 2.144
2V:Measured: 8°
Birefringence:0.025
Maximum Birefringence:δ = 0.015

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:extreme
Optical Extinction:Y,Z ^ b ~ 30°
Pleochroism:Non-pleochroic

Chemical Properties of Mimetite-M

Formula:
Pb
 
5
(AsO
 
4
)
 
3
Cl
Simplified for copy/paste:Pb5(AsO4)3Cl
Essential elements:As, Cl, O, Pb
All elements listed in formula:As, Cl, O, Pb
Common Impurities:Ca,Si,S,P

Relationship of Mimetite-M to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BN.05Alforsite
Ba
 
5
(PO
 
4
)
 
3
Cl
8.BN.05Belovite-(Ce)
NaCeSr
 
3
(PO
 
4
)
 
3
F
8.BN.05Carbonate-rich Fluorapatite
Ca
 
5
(PO
 
4
,CO
 
3
)
 
3
(F,O)
8.BN.05Carbonate-rich Hydroxylapatite
Ca
 
5
(PO
 
4
,CO
 
3
)
 
3
(OH,O)
8.BN.05Chlorapatite
Ca
 
5
(PO
 
4
)
 
3
Cl
8.BN.05Johnbaumite-M
Ca
 
5
(AsO
 
4
)
 
3
OH
8.BN.05Fluorapatite
Ca
 
2
Ca
 
3
(PO
 
4
)
 
3
F
8.BN.05Hedyphane
Pb
 
3
Ca
 
2
(AsO
 
4
)
 
3
Cl
8.BN.05Hydroxylapatite
Ca
 
5
(PO
 
4
)
 
3
(OH)
8.BN.05Johnbaumite
Ca
 
5
(AsO
 
4
)
 
3
OH
8.BN.05Mimetite
Pb
 
5
(AsO
 
4
)
 
3
Cl
8.BN.05Morelandite
Ca
 
2
Ba
 
3
(AsO
 
4
)
 
3
Cl
8.BN.05Pyromorphite
Pb
 
5
(PO
 
4
)
 
3
Cl
8.BN.05Fluorstrophite
SrCaSr
 
3
(PO
 
4
)
 
3
F
8.BN.05Svabite
Ca
 
5
(AsO
 
4
)
 
3
F
8.BN.05Turneaureite
Ca
 
5
(AsO
 
4
)
 
3
Cl
8.BN.05Vanadinite
Pb
 
5
(VO
 
4
)
 
3
Cl
8.BN.05Belovite-(La)
NaLaSr
 
3
(PO
 
4
)
 
3
F
8.BN.05Deloneite
(Na
 
0.5
REE
 
0.25
Ca
 
0.25
)(Ca
 
0.75
REE
 
0.25
)Sr
 
1.5
(CaNa
 
0.25
REE
 
0.25
)(PO
 
4
)
 
3
F
 
0.5
(OH)
 
0.5
8.BN.05Fluorcaphite
SrCaCa
 
3
(PO
 
4
)
 
3
F
8.BN.05Kuannersuite-(Ce)
NaCeBa
 
3
(PO
 
4
)
 
3
F
 
0.5
Cl
 
0.5
8.BN.05Hydroxylapatite-M
Ca
 
5
(PO
 
4
)
 
3
OH
8.BN.05Phosphohedyphane
Ca
 
2
Pb
 
3
(PO
 
4
)
 
3
Cl
8.BN.05Stronadelphite
Sr
 
5
(PO
 
4
)
 
3
F
8.BN.05Fluorphosphohedyphane
Ca
 
2
Pb
 
3
(PO
 
4
)
 
3
F
8.BN.05Carlgieseckeite-(Nd)
NaNdCa
 
3
(PO
 
4
)
 
3
F
8.BN.05Miyahisaite
(Sr,Ca)
 
2
Ba
 
3
(PO
 
4
)
 
3
F
8.BN.10Arctite
Na
 
2
Ca
 
4
(PO
 
4
)
 
3
F
Related Minerals - Hey's Index Grouping:

- +
22.2.1Sampleite
NaCaCu
 
5
(PO
 
4
)
 
4
Cl · 5H
 
2
O
22.2.2Lavendulan
NaCaCu
 
5
(AsO
 
4
)
 
4
Cl · 5H
 
2
O
22.2.3Chlorapatite
Ca
 
5
(PO
 
4
)
 
3
Cl
22.2.4Turneaureite
Ca
 
5
(AsO
 
4
)
 
3
Cl
22.2.5Shubnikovite
Ca
 
2
Cu
 
8
(AsO
 
4
)
 
6
(OH)Cl · 7H
 
2
O
22.2.6Richelsdorfite
Ca
 
2
Cu
 
5
Sb(AsO
 
4
)
 
4
(OH)
 
6
Cl · 6H
 
2
O
22.2.7Alforsite
Ba
 
5
(PO
 
4
)
 
3
Cl
22.2.8Morelandite
Ca
 
2
Ba
 
3
(AsO
 
4
)
 
3
Cl
22.2.9Pyromorphite
Pb
 
5
(PO
 
4
)
 
3
Cl
22.2.10Mimetite
Pb
 
5
(AsO
 
4
)
 
3
Cl
22.2.12Sahlinite
Pb
 
14
(AsO
 
4
)
 
2
O
 
9
Cl
 
4
22.2.13Georgiadèsite
Pb
 
4
(AsO
 
3
)Cl
 
4
(OH)
22.2.14Vanadinite
Pb
 
5
(VO
 
4
)
 
3
Cl
22.2.15Kombatite
Pb
 
14
(VO
 
4
)
 
2
O
 
9
Cl
 
4
22.2.16Leningradite
PbCu
 
3
(VO
 
4
)
 
2
Cl
22.2.17Hedyphane
Pb
 
3
Ca
 
2
(AsO
 
4
)
 
3
Cl
22.2.18Nealite
Pb
 
4
Fe
2+
 
(As
3+
 
O
 
3
)
 
2
Cl
 
4
· 2H
 
2
O

Other Names for Mimetite-M

Synonyms:
ClinomimetiteIMA1990-043IMA1990-043a
Other Languages:
German:Klinomimetesit
Russian:Клиномиметит
Spanish:Clinomimetita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Mimetite-M

Reference List:

- +
Dai, Y. (1993). Clinomimetite. The history and substantiation of the natural monoclinic dimorph of mimetite. Mineralogical Record: 24, 307-310.

Dai, Y., J. M. Hughes & P. B. Moore (1991): The crystal structures of mimetite and clinomimetite, Pb5(AsO4)Cl: Canadian Mineralogist: 29, 369-376.

Pasero, M., Kampf, A. R., Ferraris, C., Pekov, I. V., Rakovan, J. and White, T. J. (2010): Nomenclature of the apatite supergroup minerals. European Journal of Mineralogy 22, 163-179.

Internet Links for Mimetite-M

Search Engines:
  • Look for Mimetite-M on Google
  • Look for Mimetite-M images on Google
  • External Links:
  • Clinomimetite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Buy from Dave Bunk Minerals
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Top quality minerals from Kristalle of California
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  • Fine Minerals from Weinrich Minerals, Inc.
  • Mimetite-M specimens for sale - minfind.com
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  • Fabre Minerals - search for Mimetite-M specimens
  • Find Mimetite-M on www.crystalclassics.co.uk
  • High-end worldwide specimens & outstanding customer service
  • Specimens:The following Mimetite-M specimens are currently listed for sale on minfind.com.

    Localities for Mimetite-M

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    France
     
    • Rhône-Alpes
      • Rhône
        • Poule-les-Echarmeaux
    Le cahier des Micromonteurs, 1-2010, p. 4, Association Jean Wyart, bilan des activités 2009, Vincent Bourgoin, Georges Favreau
    Germany
     
    • Rhineland-Palatinate
      • Westerwald
        • Wied Iron Spar District
          • Altenkirchen
            • Bürdenbach
    [Mineralogical Record 1993 307-310]
    • Saxony
      • Erzgebirge
        • Johanngeorgenstadt District
          • Johanngeorgenstadt
    [Mineralogical Record 1993 307-310; Wittern: "Mineralfundorte in Deutschland", 2001]
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
        • Lavrion District Mines
          • Agios Konstantinos [St Constantine] (Kamariza)
    No reference listed
          • Plaka
            • Plaka Mines
    No reference listed
          • Sounion Area
            • Agia Varvara Mines (St Barbara Mines)
    Lapis, 24, 7/8, (1999)
    No reference listed
            • Sounion Mines
    Lapis, 24, 7/8 (1999)
          • Soureza area
    No reference listed
    USA
     
    • Utah
      • Juab Co.
        • East Tintic Mts
          • Tintic District
    various added photos
    Rick Dalrymple Collection
    UGMS Bull 117 Minerals and Mineral Localities of Utah and Min Rec 1993 p 307-310
    Mineral and/or Locality  
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