Greenockite Mineral Data

Greenockite Mineral Data +

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General Greenockite Information

Chemical Formula:

CdS

Composition:

Molecular Weight = 144.48 gm

Cadmium 77.81 % Cd

Sulfur 22.19 % S

______

100.00 %

Empirical Formula:

CdS

Environment:

Traprock cavities and ore veins.

IMA Status:

Valid Species (Pre-IMA) 1840

Locality:

Greenock, Scotland. Link to MinDat.org Location Data.

Name Origin:

Named after Lord Greenock (Ch. M. Cathcart 1783-1859).

Synonym:

ICSD 60629

PDF 41-1049

Greenockite Image

Images:

Greenockite

Comments: Brown, equant crystal of greenockite on prehnite.
Location: Summit, Union County, New Jersey, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Greenockite Crystallography

Axial Ratios:

a:c = 1:1.63874

Cell Dimensions:

a = 3.82, c = 6.26, Z = 2; V = 79.11 Den(Calc)= 6.06

Crystal System:

Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 6₃mc

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

By Intensity(I/I_o): 3.16(1), 3.58(0.75), 3.36(0.6),

Forms:

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

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, Note: wurtzite structure

Physical Properties of Greenockite

Cleavage:

[1120] Distinct, [0001] Imperfect

Color:

Honey yellow, Citron yellow, Orange yellow.

Density:

3.98 - 5, Average = 4.49

Diaphaniety:

Opaque to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Colloform - Forming from a gel or colloidal mass.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3.5-4 - Copper Penny-Fluorite

Luminescence:

None.

Luster:

Adamantine - Resinous

Magnetism:

Nonmagnetic

Streak:

orange yellow

Optical Properties of Greenockite

Dichroism (e):

red or bluish green.

Dichroism (w):

blue green or blue.

Optical Data:

Uniaxial (+/-), a=2.506, b=2.529, bire=0.0230.

RL Color:

Very light lemon yellow to red-browns and blood red.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Greenockite in Air**
λ	R	∑ R(λ)
400 nm	21.10
420 nm	21.00
440 nm	21.90
460 nm	22.20
480 nm	21.80
500 nm	20.70
520 nm	20.00
540 nm	19.60
560 nm	19.10
580 nm	18.70
600 nm	18.50
620 nm	18.20
640 nm	18.00
660 nm	17.80
680 nm	17.70
700 nm	17.50

**Calculated Relative Intensity Colors of Greenockite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%	480%
R

Calculated Properties of Greenockite

Electron Density:

r_electron=5.37 gm/cc
note: r_Greenockite=6.06 gm/cc.

Fermion Index

Fermion Index = 0.19641
Boson Index = 0.80359

Photoelectric:

PE_Greenockite= 212.93 barns/electron
U=PE_Greenockite x r_electron=1,143.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Greenockite is Not Radioactive

Greenockite Classification

Dana Class:

2.8.7.2 (2)Sulfides - Including Selenides and Tellurides

(2.8)where Am Bn Xp, with (m+n):p=1:1

(2.8.7)Wurtzite Group (Hexagonal: P63mc)

2.8.7.1 Wurtzite (Zn,Fe)S P 6₃mc 6mm

2.8.7.2 Greenockite CdS P 6₃mc 6mm

2.8.7.3 Cadmoselite CdSe P 6₃mc 6mm

2.8.7.4 Rambergite! MnS P 6₃mc 6mm

Strunz Class:

II/C.13-30 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.13 - Wurtzite series

II/C.13-10 Wurtzite (Zn,Fe)S P 6₃mc 6mm

II/C.13-20 Matraite ZnS R 3m 3m

II/C.13-30 Greenockite CdS P 6₃mc 6mm

II/C.13-40 Cadmoselite CdSe P 6₃mc 6mm

II/C.13-50 Rambergite! MnS P 6₃mc 6mm

Other Greenockite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Greenockite

CdS
Dana No: 2.8.7.2 Strunz No: II/C.13-30
Locality:

Notes: