Macquartite Mineral Data

General Macquartite Information

Chemical Formula:

Pb3Cu(CrO4)(SiO3)(OH)4•2(H2O)

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

Empirical Formula:

Pb₃Cu(CrO₄)(SiO₃)(OH)₄•2(H₂O)

Environment:

Encrusting dioptase.

IMA Status:

Approved IMA 1980

Locality:

Mammoth mine, Tiger, Pinal County, Arizona, USA. Link to MinDat.org Location Data.

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.

Name Pronunciation:

Macquartite + Pronunciation

Macquartite Image

Images:

Macquartite

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

Images:

Macquartite

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

Axial Ratios:

a:b:c =3.5633:1:1.5856

Cell Dimensions:

a = 20.81, b = 5.84, c = 9.26, Z = 4; beta = 91.8° V = 1,124.82 Den(Calc)= 5.79

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m ?

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.156(1), 4.628(0.9), 4.822(0.9),

Physical Properties of Macquartite

Cleavage:

{100} Good

Color:

Orange.

Density:

5.49

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

3.5 - Copper Penny

Luster:

Adamantine

Streak:

light orange

Optical Properties of Macquartite

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

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

Electron Density:

Bulk Density (Electron Density)=5.02 gm/cc
note: Specific Gravity of Macquartite =5.79 gm/cc.

Fermion Index:

Fermion Index = 0.14
Boson Index = 0.86

Photoelectric:

PE_Macquartite=1,127.25 barns/electron
U=PE_Macquartite x rElectron Density=5,653.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Macquartite is Not Radioactive

Macquartite Classification

Dana Class:

36.01.02.01 (36)Compound Chromates

(36.01)with miscellaneous formulae

(36.01.02)Dana Group

36.01.02.01 Macquartite Pb3Cu(CrO4)(SiO3)(OH)4•2(H2O) C 2/m ? 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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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Ask about Macquartite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Macquartite Specimen Label here :

Macquartite

Pb3Cu(CrO4)(SiO3)(OH)4•2(H2O)
Dana No: 36.01.02.01 Strunz No: 09.HH.05
Locality:

Notes: