Pillaite Mineral Data

General Pillaite Information

Chemical Formula:

Pb9Sb10S23ClO0.5

Composition:

Molecular Weight = 3,909.56 gm

Copper 0.16 % Cu

Antimony 30.52 % Sb

Lead 49.29 % Pb

Sulfur 18.86 % S

Chlorine 0.96 % Cl

Oxygen 0.20 % O

______

100.00 %

Empirical Formula:

Pb_9.3Sb_9.8Cu_0.1S₂₃Cl_1.06O_0.5

Environment:

Calcite veins that cut the Ba-Fe orebody and host rocks.

IMA Status:

Approved IMA 2001 (Dana # Added)

Locality:

Buca della Vena mine in the Apuan Alps of norhtern Tuscany, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Leopoldo Pilla (1805-1848), Italian Earth scientist.

Synonym:

IMA1997-042

Pillaite Image

Images:

Pillaite

Comments: Scanning electron microscope image of acicular pillaite fibers. (Eur. J. Mineral, 13:606).
Location: Buca della Vena mine in the Apuan Alps, northern Tuscany, Italy. Scale: See Image.
© Eur. J. Mineral

Pillaite Crystallography

Axial Ratios:

a:b:c =11.9638:1:5.2795

Cell Dimensions:

a = 49.65, b = 4.15, c = 21.91, Z = 4; beta = 99.76° V = 4,449.16 Den(Calc)= 5.84

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/I_o): 3.48(1)(206), 2.956(0.47)(515,914), 3.458(0.4)(12.0.4),4.14(0.27)(205), 3.261(0.26)(406,12.0.2),

Physical Properties of Pillaite

Cleavage:

None

Color:

Black.

Diaphaneity:

Opaque

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Metallic

Streak:

brownish black

Optical Properties of Pillaite

Optical Data:

NCalc= 1.02 - from Gladstone-Dale relationship (KC = 0.0035) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Weak.

RL Bireflectance:

Weak.

RL Color:

Rare red internal reflections.

RL Pleochroism:

None.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Pillaite in Air**
λ	R	∑ R(λ)
400 nm	37.00
410 nm	35.30
420 nm	37.70
430 nm	36.30
440 nm	36.00
450 nm	36.70
460 nm	35.90
470 nm	35.70
480 nm	35.40
490 nm	35.30
500 nm	35.40
510 nm	35.10
520 nm	34.70
530 nm	34.40
540 nm	34.90
550 nm	34.20
560 nm	34.20
570 nm	34.50
580 nm	34.20
590 nm	34.00
600 nm	32.70
610 nm	32.90
620 nm	32.80
630 nm	32.80
640 nm	32.40
650 nm	32.70
660 nm	31.90
670 nm	31.90
680 nm	31.50
690 nm	31.00
700 nm	30.50

**Standardized Intensity (100%) Reflection Spectra of Pillaite in Oil**
λ	R	∑ R(λ)
400 nm	21.25
410 nm	20.30
420 nm	19.80
430 nm	20.00
440 nm	20.50
450 nm	20.40
460 nm	20.50
470 nm	20.10
480 nm	20.00
490 nm	19.75
500 nm	19.25
510 nm	19.45
520 nm	19.25
530 nm	18.95
540 nm	18.60
550 nm	18.75
560 nm	18.35
570 nm	18.15
580 nm	18.15
590 nm	17.60
600 nm	17.65
610 nm	17.50
620 nm	16.85
630 nm	16.90
640 nm	16.75
650 nm	16.45
660 nm	16.10
670 nm	16.15
680 nm	16.05
690 nm	15.55
700 nm	15.40

**Calculated Relative Intensity Colors of Pillaite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%
R

**Calculated Relative Intensity Colors of Pillaite in Oil**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	510%
R

Calculated Properties of Pillaite

Electron Density:

Bulk Density (Electron Density)=4.95 gm/cc
note: Specific Gravity of Pillaite =5.84 gm/cc.

Fermion Index:

Fermion Index = 0.11
Boson Index = 0.89

Photoelectric:

PE_Pillaite=1,000.79 barns/electron
U=PE_Pillaite x rElectron Density=4,949.24 barns/cc.

Radioactivity:

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

Pillaite Classification

Dana Class:

03.08.01.02 (03)Sulfides - Sulfosalts

(03.08)where 1 < z/y <2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.08.01)Zinkenite Group

03.08.01.01 Zinkenite Pb9Sb22S42 P 6₃ 6

03.08.01.02 Pillaite! Pb9Sb10S23ClO0.5 C 2/m 2/m

03.08.01.03 Pellouxite! (Cu,Ag)Pb10Sb12S27(Cl,S)0.6O C 2/m 2/m

03.08.01.04 Tazieffite! Pb20Cd2(As,Bi)22S50Cl10 C 2/c 2/m

Strunz Class:

02.JB.35c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.J - Sulfosalts of PbS Archetype

02.JB -Galena derivatives, with Pb

02.JB.35c Pillaite! Pb9Sb10S23ClO0.5 C 2/m 2/m

Other Pillaite Information

References:

NAME( AmMin, Vol 87, P 181) PHYS. PROP.(AmMin, Vol 87, P 181) OPTIC PROP.(EurJMin, v 13, p 605)

See Also:

Links to other databases for Pillaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Pillaite

Pb9Sb10S23ClO0.5
Dana No: 03.08.01.02 Strunz No: 02.JB.35c
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