Meneghinite Mineral Data

Meneghinite Mineral Data +

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General Meneghinite Information

Chemical Formula:

Pb13CuSb7S24

Composition:

Molecular Weight = 4,378.98 gm

Copper 1.45 % Cu

Antimony 19.46 % Sb

Lead 61.51 % Pb

Sulfur 17.57 % S

______

100.00 %

Empirical Formula:

Pb₁₃CuSb₇S₂₄

Environment:

In hydrothermal veins and contact metamorphic deposits.

IMA Status:

Valid Species (Pre-IMA) 1852

Locality:

Marble Lake, Barrie Township, Frontenac Co. Ontario, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Giuseppi Meneghini (1811-1889) of Pisa, Italy who first observed the mineral.

Synonym:

ICSD 31126

PDF 43-1476

Meneghinite Image

Images:

Meneghinite

Comments: Black, acicular crystals of meneghinite on matrix.
Location: Bottino Mine, Tuscany, Italy. Scale: 1x1 cm.
© Dave Barthelmy

Meneghinite Crystallography

Axial Ratios:

a:b:c =0.472:1:0.1717

Cell Dimensions:

a = 11.343, b = 24.028, c = 4.126, Z = 1; V = 1,124.54 Den(Calc)= 6.47

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

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

By Intensity(I/I_o): 3.27(1), 2.922(0.9), 3.74(0.8),

Forms:

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Forms: [ 1 4 1] [ 1 3 1] [ 1 1 1] [ 1 4 0] [ 1 3 0] [ 0 4 1] [ 1 2 0] [ 1 0 0] [ 1 0 1]

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Crystal Structure:

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Euler R , Hellner E , Zeitschrift fur Kristallographie , 113 (1960) p.345-372, Uber komplex zusammengesetzte sulfidische erze VI., Zur kristallstruktur des meneghinits, CuPb13Sb7S24

Physical Properties of Meneghinite

Cleavage:

[010] Perfect

Color:

Blackish gray, Lead gray.

Density:

6.34 - 6.43, Average = 6.38

Diaphaniety:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

metallic

Optical Properties of Meneghinite

Optical Data:

NCalc= 1.02 - from Gladstone-Dale relationship (KC = 0.0038) where Ncalc=Dcalc*KC+1
NCalc= 1.02 - from Gladstone-Dale relationship (KC = 0.0038) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Weak.

RL Color:

White.

RL Pleochroism:

Strong.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Meneghinite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	38.50	44.50
420 nm	39.20	45.20
440 nm	39.90	45.90
460 nm	40.20	46.40
480 nm	40.40	46.60
500 nm	40.40	46.50
520 nm	40.30	46.30
540 nm	40.00	46.00
560 nm	39.80	45.60
580 nm	39.50	45.10
600 nm	39.20	44.50
620 nm	38.80	43.80
640 nm	38.50	43.00
660 nm	38.20	42.10
680 nm	37.80	41.20
700 nm	37.40	40.20

**Calculated Relative Intensity Colors of Meneghinite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	230%
R₁
R₂

Calculated Properties of Meneghinite

Electron Density:

r_electron=5.43 gm/cc
note: r_Meneghinite=6.47 gm/cc.

Fermion Index

Fermion Index = 0.13725
Boson Index = 0.86275

Photoelectric:

PE_Meneghinite=1,196.13 barns/electron
U=PE_Meneghinite x r_electron=6,489.52 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Meneghinite is Not Radioactive

Meneghinite Classification

Dana Class:

3.3.5.1 (3)Sulfides - Sulfosalts

(3.3)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.3.5)Dana Group

3.3.5.1 Meneghinite Pb13CuSb7S24 Pbnm 2/m 2/m 2/m

Strunz Class:

II/E.15-40 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts with Arsen and Antimon x = 3.8 - 3.1

II/E.15 - Jordanite - Lengenbachite series

II/E.15-10 Jordanite Pb14(As,Sb)6S23 P 2₁/m 2/m

II/E.15-20 Geocronite Pb14(Sb,As)6S23 P 2₁/m 2/m

II/E.15-30 Gratonite Pb9As4S15 R 3m 3m

II/E.15-40 Meneghinite Pb13CuSb7S24 Pbnm 2/m 2/m 2/m

II/E.15-45 Tsugaruite! Pb4As2S7 Pba2 or Pbam Ortho

II/E.15-50 Lengenbachite Pb6(Ag,Cu)2As4S13 P1 or P1 Tri

Other Meneghinite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Print or Cut-and-Paste your Meneghinite Specimen Label here :

Meneghinite

Pb13CuSb7S24
Dana No: 3.3.5.1 Strunz No: II/E.15-40
Locality:

Notes: