Mineralogy Database

Macquartite Mineral Data

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General Macquartite Information

Help on Chemical  Formula: Chemical Formula: Pb3Cu(CrO4)(SiO3)(OH)4•2(H2O)
Help on Composition: Composition: Molecular Weight = 981.28 gm
   Chromium   5.30 %  Cr   10.19 % CrO3
   Copper     6.48 %  Cu    8.11 % CuO
   Silicon    2.86 %  Si    6.12 % SiO2
   Hydrogen   0.82 %  H     7.34 % H2O
   Lead      63.35 %  Pb   68.24 % PbO
   Oxygen    21.20 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb3Cu(CrO4)(SiO3)(OH)4•2(H2O)
Help on Environment: Environment: Encrusting dioptase.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: Mammoth mine, Tiger, Pinal County, Arizona, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Louis Charles Henri Macquart (1745-1803), French chemist who brought to France from Russia the samples of crocoite in which the element chromium was discovered.
Help on Name Pronunciation: Name Pronunciation: Macquartite + Pronunciation Say MACQUARTITE

Macquartite Image

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Comments: Straw-like prismatic yellow micro crystals of macquartite to about 0.5mm on matrix.
Location: Mammoth - St. Anthony mine, Tiger, Pinal Co., Arizona, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

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Comments: Bright yellow, prismatic crystals of macquartite in radial sprays to 0.75mm.
Location: Tiger, Mammoth district, Pinal County, Arizona, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Macquartite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.5633:1:1.5856
Help on Cell Dimensions: Cell Dimensions: a = 20.81, b = 5.84, c = 9.26, Z = 4; beta = 91.8° V = 1,124.82 Den(Calc)= 5.79
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m ?
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.156(1), 4.628(0.9), 4.822(0.9),

Physical Properties of Macquartite

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Orange.
Help on Density: Density: 5.49
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Adamantine
Help on Streak: Streak: light orange

Optical Properties of Macquartite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.353 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.283 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2263,KPDmeas= 0.2386,KC= 0.1764
Ncalc = 1.97 - 2.02
Help on Optical Data: Optical Data: Biaxial (-), a=2.28, b=2.31, g=2.34, bire=0.0600, 2V(Calc)=88, 2V(Meas)=85.

Calculated Properties of Macquartite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.02 gm/cc
note: Specific Gravity of Macquartite =5.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.14
Boson Index = 0.86
Help on Photoelectric: Photoelectric: PEMacquartite =1,127.25 barns/electron
U=PEMacquartite x rElectron Density=5,653.56 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Macquartite is Not Radioactive

Macquartite Classification

Help on  Dana Class: Dana Class: (36)Compound Chromates
  (36.01)with miscellaneous formulae
  (36.01.02)Dana Group Macquartite Pb3Cu(CrO4)(SiO3)(OH)4•2(H2O) C 2/m ? 2/m
Help on  Strunz Class: Strunz Class: 09.HH.05 09 - SILICATES (Germanates)
  09.H - Unclassified Silicates
  09.HH -With Pb
09.HH.05 Macquartite Pb3Cu(CrO4)(SiO3)(OH)4•2(H2O) C 2/m ? 2/m

Other Macquartite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Macquartite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.HH.05





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