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Meerschautite

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About MeerschautiteHide

Formula:
(Ag,Cu)6Pb43-2xSb44+2xS112Ox (x ~0.5)
Ideal formula: (Ag,Cu)5.5Pb42.4(Sb,As)45.1S112O0.8
Colour:
Lead-grey to black
Lustre:
Metallic
Specific Gravity:
5.924 (Calculated)
Crystal System:
Monoclinic
Name:
For Alain Meerschaut (b. 1945), Research Director at the CNRS (now retired), chemist-crystallographer in the field of solid-state chemistry at the Institut des Matériaux Jean Rouxel, Nantes, France, for his outstanding contribution to the definition and crystal structure study of new lead-antimony sulfosalts from Apuan Alps hydrothermal ores, i.e. scainiite, pillaite, pellouxite, rouxelite, moëloite, and marrucciite.
Structurally, an expanded derivative of owyheeite. Also has quasi-homeotypic relationships with sterryite and parasterryite; and related to ciriottiite.

Chemically unique in terms of dominating elements; somewhat similar to pellouxite.

There are two structural building blocks both based on a column with pseudotrigonal Pb6S12 core: (1) with short, Ag-rich arm; (2) with long arm containing localized Sb-O-Sb bonds.


Classification of MeerschautiteHide

Approved
Approval Year:
2013

Physical Properties of MeerschautiteHide

Metallic
Transparency:
Opaque
Colour:
Lead-grey to black
Streak:
Black
Tenacity:
Brittle
Cleavage:
Perfect
Parallel to a;
Fracture:
Conchoidal
Density:
5.924 g/cm3 (Calculated)

Optical Data of MeerschautiteHide

Type:
Anisotropic
Anisotropism:
with grey to dark grey rotation tints and brownish and greenish shades.
Bireflectance:
weak
Reflectivity:
470; (38.3, 39.9) 546; (37.4, 39.0) 589; (35.8, 37.2) 650 (R: in air)nmR1=39.7%R2= 41.4%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 41.4%.
R1 shown in black, R2 shown in red
Colour in reflected light:
white
Internal Reflections:
none
Pleochroism:
Non-pleochroic

Chemical Properties of MeerschautiteHide

Formula:
(Ag,Cu)6Pb43-2xSb44+2xS112Ox (x ~0.5)

Ideal formula: (Ag,Cu)5.5Pb42.4(Sb,As)45.1S112O0.8
IMA Formula:
(Ag,Cu)5.5Pb42.4(Sb,As)45.1S112O0.8
Common Impurities:
Cu,As,Se,Cl,(Tl)

Crystallography of MeerschautiteHide

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Setting:
P21
Cell Parameters:
a = 8.2393(1) Å, b = 43.6015(13) Å, c = 28.3688(8) Å
γ = 94.128(2)°
Ratio:
a:b:c = 0.189 : 1 : 0.651
Unit Cell V:
10164.9 ų
Z:
2
Morphology:
Prisms striated along [100], to 0.7 x 0.1 mm
Twinning:
Only observed by x-rays

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.762Å(m)
3.663Å(s)
3.334Å(vs)
3.244Å(s)
3.016Å(m)
2.968Å(m)
2.902Å(m)
2.072Å(ms)
Comments:
From Type Description.

Type Occurrence of MeerschautiteHide

General Appearance of Type Material:
Prismatic crystals
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museo di Storia Naturale e del Territorio, Universita` di Pisa, Calci (Pisa), Italy, catalogue number 19649
Geological Setting of Type Material:
Barite and pyrite orebody
Associated Minerals at Type Locality:

Synonyms of MeerschautiteHide

Other InformationHide

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 MeerschautiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Biagioni, C., Moëlo, Y., Orlandi, P., Stanley, C.J. and Evain, M. (2013) Meerschautite, IMA 2013-061. CNMNC Newsletter No. 17, October 2013, page 3004; Mineralogical Magazine, 77, 2997-3005.
Biagioni, C., Moëlo, Y., Orlandi, P., Stanley, C.J. (2016): Lead-antimony sulfosalts from Tuscany (Italy). XVII. Meerschautite, (Ag,Cu)5.5Pb42.4(Sb,As)45.1S112O0.8, a new expanded derivative of owyheeite from the Pollone mine, Valdicastello Carducci: occurrence and crystal structure. Mineralogical Magazine: 80: 675-690;

Internet Links for MeerschautiteHide

Localities for MeerschautiteHide

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.
Italy (TL)
 
  • Tuscany
    • Lucca Province
      • Pietrasanta
        • Valdicastello Carducci
Biagioni, C., Moëlo, Y., Orlandi, P., Stanley, C.J. and Evain, M. (2013) Meerschautite, IMA 2013-061. CNMNC Newsletter No. 17, October 2013, page 3004; Mineralogical Magazine, 77, 2997-3005. ; Biagioni, C., Orlandi, P., Moëlo, Y., & Bindi, L. (2014). Lead-antimony sulfosalts from Tuscany (Italy). XVI. Carducciite,(AgSb) Pb6 (As, Sb) 8S20, a new Sb-rich derivative of rathite from the Pollone mine, Valdicastello Carducci: occurrence and crystal structure. Mineralogical Magazine, 78(7), 1775-1793.
 
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