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Mimetite

This page kindly sponsored by Trevor Kitto
Formula:
Pb5(AsO4)3Cl
System:
Hexagonal
Colour:
Pale-yellow, ...
Lustre:
Sub-Adamantine, Resinous
Hardness:
3½ - 4
Name:
Named in 1835 by Fracois Sulpice Beudant from the Greek μϊμητής for "imitator," in allusion to its resemblance to pyromorphite.
Polymorph of:
Isostructural with:
Apatite Group. Apatite Supergroup.
Mimetite-Pyromorphite Series and Mimetite-Vanadinite Series. The arsenate analogue of Pyromorphite and Vanadinite. The Pb5 analogue of Hedyphane.
The hexagonal polymorph of Mimetite-M and Mimetite-2M.
The Cl analogue of Unnamed (OH-analogue of Mimetite).

A secondary mineral found in the oxidized zones of lead deposits. Usually found as small hexagonal prisms, often plain but may be modified, sprinkled on the matrix thinly to thickly. Its colour is quite variable, ranging from pale yellow to yellowish-brown to orange-yellow to orange-red, brownish, greenish, white and colorless.

Visit gemdat.org for gemological information about Mimetite.

Classification of Mimetite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
7/B.39-160
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.:
41.8.4.2
41.8.4.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
22.2.10

22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride
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http://www.mindat.org/min-2714.html
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First Recorded Occurrence of Mimetite

Year of Discovery:
1832

Occurrences of Mimetite

Geological Setting:
It is a secondary mineral found in the oxidized zones of lead mineral deposits, and in other settings where lead and arsenic occur together.

Physical Properties of Mimetite

Sub-Adamantine, Resinous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Pale-yellow, yellowish-brown, orangish-yellow, orangish-red, white, colorless; colourless or faintly tinted in transmitted light.
Streak:
White
Hardness (Mohs):
3½ - 4
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
In traces on {1011}.
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
7.24 g/cm3 (Measured)    7.26 g/cm3 (Calculated)

Crystallography of Mimetite

Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Cell Parameters:
a = 10.250(2) Å, c = 7.454(1) Å
Ratio:
a:c = 1 : 0.727
Unit Cell Volume:
V 678.22 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Typically in simple prisms [0001], barrel-shaped, showing {1010} and {1000}; also equant, rarely tabular {0001}, or pyramidal. Frequently as rounded, barrel-shaped forms; spindle-shaped, or with cavernous basal terminations; globular, stalactic, reniform and granular. Branching groups of prismatic crystals in sub-parallel position, tapering down to a point. Acicular at times.
Twinning:
Very rarely on {1122}.
Comment:
On synthetic material.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.44(20)
3.36(40)
3.06(100)
3.01(90)
2.96(70)
2.11(30)
1.994(20)
1.905(20)
Comments:
Data given are for synthetic material.

Optical Data of Mimetite

Type:
Uniaxial (-)
RI values:
nω = 2.147 nε = 2.128
Max Birefringence:
δ = 0.019
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Weak
Comments:
Visible in tinted material in transmitted light.
Comments:
May be anomalously biaxial - . Sectored

Chemical Properties of Mimetite

Formula:
Pb5(AsO4)3Cl
Essential elements:
All elements listed in formula:
Common Impurities:
Ca,F,Cr,V

Relationship of Mimetite to other Species

Series:
Forms a series with Pyromorphite (see here)
Forms a series with Vanadinite (see here)
Other Members of Group:
AlforsiteBa5(PO4)3Cl
BellitePb5 (AsO4,CrO4, SiO2)3Cl
Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
ChlorapatiteCa5(PO4)3Cl
FluorapatiteCa2Ca3(PO4)3F
HydroxylapatiteCa5(PO4)3(OH)
Hydroxylapatite-MCa5(PO4)3OH
HydroxylpyromorphitePb5(PO4)3(OH)
JohnbaumiteCa5(AsO4)3OH
Johnbaumite-MCa5(AsO4)3OH
Manganapatite
Mimetite-2M
Miyahisaite(Sr,Ca)2Ba3(PO4)3F
Mn-bearing Fluorapatite(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
OxypyromorphitePb10(PO4)6O
PieczkaiteMn5(PO4)3Cl
PyromorphitePb5(PO4)3Cl
StronadelphiteSr5(PO4)3F
SvabiteCa5(AsO4)3F
TurneaureiteCa5(AsO4)3Cl
Unnamed (F-analogue of Pyromorphite)Pb5(PO4)3F
Unnamed (OH-analogue of Mimetite)Pb5(AsO4)3(OH)
VanadinitePb5(VO4)3Cl
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.05Mimetite-MPb5(AsO4)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.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
22.2.11Mimetite-MPb5(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

Other Information

May fluoresce reddish yellow under SW and LW
Electrical:
Piezoelectric.
Other Information:
Soluble in HNO3 and KOH.

Forms pseudomorphs after an unknown mineral (Anglesite ?) (Durango, Mexico). Also alters to Bayldonite (Tsumeb).
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

Reference List:
Wallerius, J.G (1748) Mineralogia, eller Mineralriket. Stockholm: 296 (as Plumbum arsenico mineralisatum).

Proust (1787) Le Journal de physique et le radium, Paris: 30: 394 (as Plomb vert arsenical).

Fourcroy (1789) Mem. Ac. Sc., Paris (as Plomb vert arsenical).

Lenz, D.G. (1794) Versuch einer vollständigen Anleitung zur Kenntniss der Mineralien. 2 volumes, Leipzig: 2: 224 (as Arsenikalisches Bleyerz).

Haidinger, Wm. (1825) Treatise on Mineralogy, by F. Mohs; translation with considerable additions. 3 volumes, Edinburg: 2: 135.

Beudant, F.S. (1832), Traité élémentaire de Minéralogie, second edition, 2 volumes: 2: 594 (as Mimetèse).

Shepard C.U. (1835) Treatise on Mineralogy. First edition (as Mimetene).

Breithaupt, A. (1841) Vollständige Handbuch der Mineralogie. Vol. 2: 289 (as Mimetesit).

Haidinger, Wm. (1845) (as Mimetit).

Glocker, E.F. (1847) Generum et specierum mineralium secundum ordines naturales digestorum synopsis. Halle: 254 (as Mimetit).

Igelström (1865) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 22: 229.

Baumhauer (1876) Jb. Min.: 411.

Bertrand (1881) Bulletin de la Société française de Minéralogie: 4: 35.

Jannettaz (1881) Bulletin de la Société française de Minéralogie: 4: 39.

Jannettaz and Michel (1881) Bulletin de la Société française de Minéralogie: 4: 196.

Smith (1885) American Journal of Science: 20: 248.

Genth and vom Rath (1887) Proceedings of the American Philosophical Society: 24: 33.

Klein (1902) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 748.

Bowman (1903) Mineralogical Magazine: 13: 324.

Serra (1909) Reale accademia nazionale dei Lincei, Rome: 18: 361.

Lacroix, A. (1910) Minéralogie de la France et des ses colonies, Paris. 5 volumes: vol. 4: 407 (Bertrand analysis).

Goldschmidt and Schroeder (1912) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 51: 362.

Amadori (1916) 1st. Lombardo, Rend.: [2], 49, 137.

Wherry (1918) Proceedings of the U.S. National Museum: 54: 373.

Anderson (1920) Rec. Australian Museum: 13: 1.

Goldschmidt, V. (1920) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 6: 45.

Hintze, Carl (1924) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [4A]: 590, 595, 603.

Carobbi (1926) Atti della Reale accademia delle scienze fisiche e matematiche, Naples, Rend.: [3], 32, 54.

Drescher (1926) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 257.

Aminoff and Parsons (1927) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 49: 438.

Zambonini and Ferrari (1928) Reale accademia nazionale dei Lincei, Rome, Atti.: [6], 7, 283.

Lietz (1931) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 77: 437.

Mehmel (1931) Zeitschrift für Physikalische Chemie, Leipzig, Berlin: 15A: 223.

Ahlfeld (1932) Jb. Min., Beil.-Bd.: 66: 41.

Hendricks, Jefferson, and Mosley (1932) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 81: 352.

Schouten (1934) Economic Geology: 29: 611.

Chirva (1935) Trav. inst. Lomonossov, ac. Sc. U.R.S.S., no.: 5: 86.

Mélon (1943) Société géologique de Belgique, Liége, Annales: 66: B56.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 889-895.

Baker, W. E. (1966): An X-ray diffraction study of synthetic members of the pyromorphite series. American Mineralogist 51, 1712-1721.

American Mineralogist (1969): 54: 993.

Zeitschrift für Kristallographie (1990): 191: 125-129.

Canadian Mineralogist (1991): 29: 369-376.

Gaines, Richard V., H. Catherine, W. Skinner, Eugene E. Foord, Brian Mason, Abraham Rosenzweig (1997), Dana's New Mineralogy : The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana: 866.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2000) Handbook of Mineralogy, Volume IV. Arsenates, Phosphates, Vanadates. Mineral Data Publishing, Tucson, AZ, 680pp.: 376.

Internet Links for Mimetite

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

Localities for Mimetite

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.
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