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Mimetite-M

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Formula:
Pb5(AsO4)3Cl
Colour:
Pale greenish yellow, white.
Lustre:
Sub-Adamantine, Vitreous, Sub-Vitreous, Resinous, Waxy
Hardness:
4
Specific Gravity:
7.36
Crystal System:
Monoclinic
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:
A polymorphic variant of mimetite.

See also mimetite-2M.


Hide all sections | Show all sections

Classification of Mimetite-MHide

Notes:
Redefined by the IMA
Approval History:
Redefined as a Polymorphic Variant of mimetite in 2010.
7/B.39-165
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 ed.:
41.8.6.1
41.8.6.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
22.2.11

22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride

Physical Properties of Mimetite-MHide

Sub-Adamantine, Vitreous, Sub-Vitreous, Resinous, Waxy
Transparency:
Transparent, Translucent
Colour:
Pale greenish yellow, white.
Streak:
White
Hardness:
Tenacity:
Brittle
Density:
7.36 g/cm3 (Measured)    7.37 g/cm3 (Calculated)

Optical Data of Mimetite-MHide

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

Formula:
Pb5(AsO4)3Cl
Common Impurities:
Ca,Si,S,P

Crystallography of Mimetite-MHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/b
Cell Parameters:
a = 10.189 Å, b = 20.372 Å, c = 7.461 Å
β = 119.88°
Ratio:
a:b:c = 0.5 : 1 : 0.366
Unit Cell V:
1,342.82 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.342 (50)
3.048 (100)
3.008 (70)
2.947 (70)
2.106 (60)
1.961 (50)
1.903 (50)

First Recorded Occurrence of Mimetite-MHide

General Appearance of First Recorded Material:
Hexagonal prismatic crystals
Geological Setting of First Recorded Material:
Polymetallic ore deposit.
Associated Minerals at First Recorded Locality:

Synonyms of Mimetite-MHide

Other Language Names for Mimetite-MHide

Related Minerals - Nickel-Strunz GroupingHide

8.BN.05AlforsiteBa5(PO4)3ClHex. 6/m : P63/m
8.BN.05Belovite-(Ce)NaCeSr3(PO4)3FTrig. 3 : P3
8.BN.05Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)Hex.
8.BN.05Carbonate-rich HydroxylapatiteCa5(PO4,CO3)3(OH,O)Hex.
8.BN.05ChlorapatiteCa5(PO4)3ClHex. 6/m : P63/m
8.BN.05Johnbaumite-MCa5(AsO4)3OHMon. 2/m : P21/m
8.BN.05FluorapatiteCa5(PO4)3FHex. 6/m : P63/m
8.BN.05HedyphaneCa2Pb3(AsO4)3ClHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
8.BN.05HydroxylapatiteCa5(PO4)3(OH)Hex. 6/m : P63/m
8.BN.05JohnbaumiteCa5(AsO4)3OHHex. 6/m : P63/m
8.BN.05MimetitePb5(AsO4)3ClHex. 6/m : P63/m
8.BN.05MorelanditeCa2Ba3(AsO4)3Cl
8.BN.05PyromorphitePb5(PO4)3ClHex. 6/m : P63/m
8.BN.05FluorstrophiteSrCaSr3(PO4)3FHex. 6/m : P63/m
8.BN.05SvabiteCa5(AsO4)3FHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
8.BN.05TurneaureiteCa5(AsO4)3ClHex.
8.BN.05VanadinitePb5(VO4)3ClHex. 6/m : P63/m
8.BN.05Belovite-(La)NaLaSr3(PO4)3FTrig. 3 : P3
8.BN.05Deloneite(Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5Trig.
8.BN.05FluorcaphiteSrCaCa3(PO4)3FHex. 6/m : P63/m
8.BN.05Kuannersuite-(Ce)NaCeBa3(PO4)3F0.5Cl0.5Trig. 3 : P3
8.BN.05Hydroxylapatite-MCa5(PO4)3OHMon. 2/m : P21/b
8.BN.05PhosphohedyphaneCa2Pb3(PO4)3ClHex. 6/m : P63/m
8.BN.05StronadelphiteSr5(PO4)3FHex. 6/m : P63/m
8.BN.05FluorphosphohedyphaneCa2Pb3(PO4)3FHex. 6/m : P63/m
8.BN.05Carlgieseckeite-(Nd)NaNdCa3(PO4)3FTrig. 3 : P3
8.BN.05Miyahisaite(Sr,Ca)2Ba3(PO4)3F Hex. 6/m : P63/m
8.BN.10ArctiteNa2Ca4(PO4)3FTrig. 3m (3 2/m) : R3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.2.1SampleiteNaCaCu5(PO4)4Cl · 5H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
22.2.2LavendulanNaCaCu5(AsO4)4Cl · 5H2OMon. 2/m
22.2.3ChlorapatiteCa5(PO4)3ClHex. 6/m : P63/m
22.2.4TurneaureiteCa5(AsO4)3ClHex.
22.2.5ShubnikoviteCa2Cu8(AsO4)6(OH)Cl · 7H2O
22.2.6RichelsdorfiteCa2Cu5Sb(AsO4)4(OH)6Cl · 6H2OMon. 2/m
22.2.7AlforsiteBa5(PO4)3ClHex. 6/m : P63/m
22.2.8MorelanditeCa2Ba3(AsO4)3Cl
22.2.9PyromorphitePb5(PO4)3ClHex. 6/m : P63/m
22.2.10MimetitePb5(AsO4)3ClHex. 6/m : P63/m
22.2.12SahlinitePb14(AsO4)2O9Cl4Mon.
22.2.13GeorgiadèsitePb4(AsO3)Cl4(OH)Mon.
22.2.14VanadinitePb5(VO4)3ClHex. 6/m : P63/m
22.2.15KombatitePb14(VO4)2O9Cl4Mon.
22.2.16LeningraditePbCu3(VO4)2ClOrth. mmm (2/m 2/m 2/m) : Ibam
22.2.17HedyphaneCa2Pb3(AsO4)3ClHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
22.2.18NealitePb4Fe2+(As3+O3)2Cl4 · 2H2OTric. 1 : P1

Other InformationHide

Health Risks:
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-MHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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-MHide

Localities for Mimetite-MHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
France
 
  • Auvergne-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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