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Mimetite-M

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

See also mimetite-2M.

Classification of Mimetite-M

Discredited 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
mindat.org URL:
http://www.mindat.org/min-1080.html
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First Recorded Occurrence of Mimetite-M

General Appearance of First Recorded Material:
Hexagonal prismatic crystals
Year of Discovery:
1991
Geological Setting of First Recorded Material:
Polymetallic ore deposit.
Associated Minerals at First Recorded Locality:

Occurrences of Mimetite-M

Geological Setting:
Polymetallic ore deposits

Physical Properties of Mimetite-M

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

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 Data:
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
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-M

Formula:
Pb5(AsO4)3Cl
Essential elements:
All elements listed in formula:
Common Impurities:
Ca,Si,S,P

Relationship of Mimetite-M to other Species

8.BN.05AlforsiteBa5(PO4)3Cl
8.BN.05Belovite-(Ce)NaCeSr3(PO4)3F
8.BN.05Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
8.BN.05Carbonate-rich HydroxylapatiteCa5(PO4,CO3)3(OH,O)
8.BN.05ChlorapatiteCa5(PO4)3Cl
8.BN.05Johnbaumite-MCa5(AsO4)3OH
8.BN.05FluorapatiteCa2Ca3(PO4)3F
8.BN.05HedyphanePb3Ca2(AsO4)3Cl
8.BN.05HydroxylapatiteCa5(PO4)3(OH)
8.BN.05JohnbaumiteCa5(AsO4)3OH
8.BN.05MimetitePb5(AsO4)3Cl
8.BN.05MorelanditeCa2Ba3(AsO4)3Cl
8.BN.05PyromorphitePb5(PO4)3Cl
8.BN.05FluorstrophiteSrCaSr3(PO4)3F
8.BN.05SvabiteCa5(AsO4)3F
8.BN.05TurneaureiteCa5(AsO4)3Cl
8.BN.05VanadinitePb5(VO4)3Cl
8.BN.05Belovite-(La)NaLaSr3(PO4)3F
8.BN.05Deloneite(Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5
8.BN.05FluorcaphiteSrCaCa3(PO4)3F
8.BN.05Kuannersuite-(Ce)NaCeBa3(PO4)3F0.5Cl0.5
8.BN.05Hydroxylapatite-MCa5(PO4)3OH
8.BN.05PhosphohedyphaneCa2Pb3(PO4)3Cl
8.BN.05StronadelphiteSr5(PO4)3F
8.BN.05FluorphosphohedyphaneCa2Pb3(PO4)3F
8.BN.05Carlgieseckeite-(Nd)NaNdCa3(PO4)3F
8.BN.05Miyahisaite(Sr,Ca)2Ba3(PO4)3F
8.BN.10ArctiteNa2Ca4(PO4)3F
22.2.1SampleiteNaCaCu5(PO4)4Cl · 5H2O
22.2.2LavendulanNaCaCu5(AsO4)4Cl · 5H2O
22.2.3ChlorapatiteCa5(PO4)3Cl
22.2.4TurneaureiteCa5(AsO4)3Cl
22.2.5ShubnikoviteCa2Cu8(AsO4)6(OH)Cl · 7H2O
22.2.6RichelsdorfiteCa2Cu5Sb(AsO4)4(OH)6Cl · 6H2O
22.2.7AlforsiteBa5(PO4)3Cl
22.2.8MorelanditeCa2Ba3(AsO4)3Cl
22.2.9PyromorphitePb5(PO4)3Cl
22.2.10MimetitePb5(AsO4)3Cl
22.2.12SahlinitePb14(AsO4)2O9Cl4
22.2.13GeorgiadèsitePb4(AsO3)Cl4(OH)
22.2.14VanadinitePb5(VO4)3Cl
22.2.15KombatitePb14(VO4)2O9Cl4
22.2.16LeningraditePbCu3(VO4)2Cl
22.2.17HedyphanePb3Ca2(AsO4)3Cl
22.2.18NealitePb4Fe2+(As3+O3)2Cl4 · 2H2O

Other Names for Mimetite-M

Name in Other Languages:

Other Information

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-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

Specimens:
The following Mimetite-M specimens are currently listed for sale on minfind.com.

Localities for Mimetite-M

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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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