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Macquartite

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Formula:
Cu2Pb7(CrO4)4(SiO4)2(OH)2
Colour:
Orange cadmium
Hardness:
Specific Gravity:
5.49
Crystal System:
Monoclinic
Name:
Named in 1980 by Sidney A. Williams and Marjorie Duggan in honor of Louis Charles Henri Macquart [5 December 1745 Reims, France - 12 July 1808 Paris, France], French medical doctor (l'école Centrale de Seine et Marne), chemist, and mineralogist. Macquart's books mostly contain medical information, but his Essais ou Recueil de mémoires sur plusieurs points de minéralogie with 580 pages + 7 plates in 1789 described the mines and minerals of Berosovsk and other topics. Macquart wrote a research article with Louis Vauquelin and they reported that the future "crocoite" contained lead peroxide, iron, and aluminum. Johan Bindheim re-analyzed the future "crocoite" and reported it contained molybdic acid, nickel, cobalt, iron, and copper. In 1798, Vauquelin re-analyzed the mineral, using the specimens supplied by Macquart and discovered they contained a new element, which Vauquelin named chromium. Macquartite was named in acknowledgement of Macquart's role in the chain leading to the discovery of chromium as a new element. Vaquelin's answer to the uncertainty of crocoite's true composition, unfortunately does not document Macquart's chemical participation in the discovery of chromium. Macquart was curator of the mineral collection at Fontainebleau, Seine-et-Marne.
This page provides mineralogical data about Macquartite.


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Classification of MacquartiteHide

Approved
Approval Year:
1979
9.HH.05

9 : SILICATES (Germanates)
H : Unclassified silicates
H : With Pb
Dana 7th ed.:
36.1.2.1
36.1.2.1

36 : COMPOUND CHROMATES
1 : Miscellaneous
17.10.29

17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate

Physical Properties of MacquartiteHide

Colour:
Orange cadmium
Streak:
pale orange
Hardness:
3½ on Mohs scale
Cleavage:
Distinct/Good
Good on {100}
Density:
5.49 g/cm3 (Measured)    5.58 g/cm3 (Calculated)

Optical Data of MacquartiteHide

Type:
Biaxial (-)
RI values:
nα = 2.280 nβ = 2.310 nγ = 2.340
2V:
Measured: 85° , Calculated: 88°
Birefringence:
0.06
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v strong

Chemical Properties of MacquartiteHide

Formula:
Cu2Pb7(CrO4)4(SiO4)2(OH)2

Crystallography of MacquartiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 20.81 Å, b = 5.84 Å, c = 9.26 Å
β = 91.8°
Ratio:
a:b:c = 3.563 : 1 : 1.586
Unit Cell V:
1,124.82 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Euhedral crystals in quartz
Comment:
Probably C2/m

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.43 (20)
7.019 (10)
4.822 (90)
4.628 (90)
4.202 (10)
3.557 (10)
3.467 (30)
3.405 (30)
3.211 (10)
3.156 (100)
3.090 (60)
2.925 (50)
2.818 (10)
2.768 (50)
2.707 (10)
2.607 (5)
2.561 (5)
2.525 (30)
2.469 (20)
2.320 (40b)
2.235 (40b)
2.135 (20b)
2.077 (20)
2.043 (20)
1.958 (20)
1.892 (30)
1.876 (30)
1.820 (10b)
1.779 (10)
1.756 (10)
1.728 (10)
1.700 (5)
1.673 (10)
1.578 (30)
Comments:
ICDD 33-466

Type Occurrence of MacquartiteHide

Place of Conservation of Type Material:
British Museum, University of Arizona Geological Museum.
Associated Minerals at Type Locality:

Synonyms of MacquartiteHide

Other Language Names for MacquartiteHide

German:Macquartit
Spanish:Macquartita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz8 photos of Macquartite associated with Quartz on mindat.org.
Dioptase4 photos of Macquartite associated with Dioptase on mindat.org.
Fluorite3 photos of Macquartite associated with Fluorite on mindat.org.
Mimetite1 photo of Macquartite associated with Mimetite on mindat.org.
Caledonite1 photo of Macquartite associated with Caledonite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.HH.10LuddeniteCu2Pb2Si5O14 · 4H2OMon.
9.HH.15CreaseyitePb2Cu2Fe3+2(Si4.67Al0.33)O15.33(OH)3 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
9.HH.20PlumbotsumitePb13(CO3)6(Si10O27) · 3H2OOrth.
9.HH.25MolybdophyllitePb8Mg9[Si10O28(OH)8|O2|(CO3)3] · H2O Mon. 2 : B2

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.10.1NoseanNa8(Al6Si6O24)(SO4) · H2OIso. 4 3m : P4 3n
17.10.2PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2OHex.
17.10.3Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2OHex. 6 : P63
17.10.4Haüyne(Na,K)3(Ca,Na)(Al3Si3O12)(SO4,S,Cl)Iso. 4 3m : P4 3n
17.10.5Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4Hex.
17.10.6Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)Mon.
17.10.7Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2OMon.
17.10.8MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2Hex.
17.10.9Delhayelite(Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2OOrth.
17.10.10HydrodelhayeliteKCa2AlSi7O17(OH)2 · 6H2OOrth.
17.10.11Davyne(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2Hex. 6/m : P63/m
17.10.12Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6Trig. 3m : P3 1c
17.10.13Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2OHex.
17.10.14Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2Hex.
17.10.15Sacrofanite(Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6•2H2OHex.
17.10.16Chessexite(Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2OOrth.
17.10.17InneliteNa2CaBa4Ti3(Si2O7)2(SO4)2O4Tric. 1 : P1
17.10.18ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2OHex. 6 : P63
17.10.19Ellestadite
17.10.20ChlorellestaditeCa5(SiO4)1.5(SO4)1.5ClHex. 6/m : P63/m
17.10.21HydroxylellestaditeCa5(SiO4)1.5(SO4)1.5(OH)Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm
17.10.22FluorellestaditeCa5(SiO4)1.5(SO4)1.5FHex.
17.10.23MattheddleitePb5(SiO4)1.5(SO4)1.5(Cl,OH)Hex. 6/m : P63/m
17.10.24QueititePb4Zn2(SO4)(SiO4)(Si2O7)Mon. 2 : P21
17.10.25RoeblingitePb2Ca6Mn2+(Si3O9)2(SO4)2(OH)2 · 4H2OMon. 2/m : B2/m
17.10.26YoshimuraiteBa2Mn2Ti(Si2O7)(PO4)O(OH)Tric. 1 : P1
17.10.27KegelitePb8Al4(Si8O20)(SO4)2(CO3)4(OH)8Mon.
17.10.28Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2OHex.
17.10.30WeliniteMn2+6(W6+,Mg)2(SiO4)2(O,OH)6Trig. 3 : P3

Fluorescence of MacquartiteHide

Not fluorescent in UV

Other InformationHide

Notes:
Decomposed by concentrated HCl.
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 MacquartiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Williams, S.A. & M. Duggan (1980), La macquartite: Un nouveau silico-chromate de Tiger, AZ, Bulletin de Mineralogie: 103: 530-532.
American Mineralogist (1981): 66: 638.
American Mineralogist (1995): 80: 408.

Internet Links for MacquartiteHide

Localities for MacquartiteHide

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.
USA (TL)
 
  • Arizona
    • Pinal Co.
      • Mammoth District
        • Tiger
          • St. Anthony deposit
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 282; Williams, S.A. & M. Duggan (1980), La macquartite: Un nouveau silico-chromate de Tiger, AZ, Bull. Mineral.: 103: 530-532.
Mineral and/or Locality  
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