Macquartite Mineral Data + 
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- 36.1.2.1 Macquartite Pb3Cu(CrO4)(SiO3)(OH)4·2(H2O) C 2/m ? 2/m
- VIII/B.28-10 Iranite Pb10Cu(CrO4)6(SiO4)2(F,OH)2 P1 1
- VIII/B.28-20 Hemihedrite Pb10Zn(CrO4)6(SiO4)2F2 P1 1
- VIII/B.28-25 Wherryite Pb7Cu2(SO4)4(SiO4)2(OH)2 C 2/m 2/m
- VIII/B.28-30 Macquartite Pb3Cu(CrO4)(SiO3)(OH)4·2(H2O) C 2/m ? 2/m
General Macquartite Information |
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 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. | ||
Macquartite Image | |||
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Macquartite Crystallography |
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| 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 ? | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.156(1), 4.628(0.9), 4.822(0.9), | ||
Physical Properties of Macquartite |
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| 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 |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=5.02 gm/cc |
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| Fermion Index |
Fermion Index = 0.14646 Boson Index = 0.85354 |
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| Photoelectric: |
PEMacquartite =1,127.25 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Macquartite is Not Radioactive |
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Macquartite Classification |
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| Dana Class: |
36.1.2.1 (36)Compound Chromates | ||
| (36.1)with miscellaneous formulae | |||
| (36.1.2)Dana Group | |||
| Strunz Class: |
VIII/B.28-30 VIII - Silicates | ||
| VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with groups [SO4]2-, [CrO4]2- and [PO4]3- | |||
| VIII/B.28 - Iranite - Macquartite series | |||
Other Macquartite Information |
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| 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris Search for Macquartite using: Visit our Advertisers for Macquartite : Translate Macquartite Mineral Data : Ask about Macquartite here : Print or Cut-and-Paste your Macquartite Specimen Label here :
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