Polydymite Mineral Data

Polydymite Mineral Data +

General Polydymite Information

Chemical Formula:

NiNi2S4

Composition:

Molecular Weight = 304.33 gm

Nickel 57.85 % Ni

Sulfur 42.15 % S

______

100.00 %

Empirical Formula:

NiNi₂S₄

Environment:

Found in hydrothermal veins. Forms a series with linnaeite.

IMA Status:

Valid Species (Pre-IMA) 1876

Locality:

Grünau mine, Sayn-Altenkirchen, Nordrhein-Westfalen, Germany. Link to MinDat.org Location Data.

Name Origin:

From the Greek for "many" and "twin", as the mineral is observed in twinned forms.

Synonym:

ICSD 36271

PDF 47-1739

Polydymite Image

Images:

Polydymite

Comments: Octahedral crystals of polydymite on matrix.
Location: Gr?neau Mine (Gr?ne Au Mine; Gr?nau Mine), Schutzbach, Betzdorf, Siegen District (W), Rhineland-Palatinate, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Polydymite Crystallography

Cell Dimensions:

a = 9.405, Z = 8; V = 831.91 Den(Calc)= 4.86

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

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

By Intensity(I/I_o): 1.674(1), 2.36(0.9), 2.85(0.9),

Forms:

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Forms: [ 0 0 1] [ 1 1 1]

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Crystal Structure:

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Lundqvist D , Arkiv for Mineralogi och Geologi , 24 (1947) p.1-12, X-ray studies on the binary system Ni-S, Note: spinel structure, Locality: synthetic

Physical Properties of Polydymite

Cleavage:

[001] Indistinct

Color:

Violet gray, Copper red, Light gray, Steel gray.

Density:

4.5 - 4.8, Average = 4.65

Diaphaniety:

Opaque

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Octahedral Crystals - Occurs as octahedral shaped crystals.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

4.5-5.5 - Near Apatite

Luster:

Metallic

Streak:

black gray

Optical Properties of Polydymite

Optical Data:

NCalc= 1.9 - from Gladstone-Dale relationship (KC = 0.1842) where Ncalc=Dcalc*KC+1
NCalc= 1.86 - from Gladstone-Dale relationship (KC = 0.1842) where Ncalc=Dmeas*KC+1

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Polydymite in Air**
λ	R	∑ R(λ)
400 nm	41.40
420 nm	42.00
440 nm	42.60
460 nm	43.30
480 nm	43.80
500 nm	44.40
520 nm	44.90
540 nm	45.40
560 nm	46.20
580 nm	47.10
600 nm	48.10
620 nm	49.20
640 nm	50.50
660 nm	51.70
680 nm	53.10
700 nm	54.50

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

Calculated Properties of Polydymite

Electron Density:

r_electron=4.73 gm/cc
note: r_Polydymite=4.86 gm/cc.

Fermion Index

Fermion Index = 0.00969
Boson Index = 0.99031

Photoelectric:

PE_Polydymite= 25.34 barns/electron
U=PE_Polydymite x r_electron= 119.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Polydymite is Not Radioactive

Polydymite Classification

Dana Class:

2.10.1.7 (2)Sulfides - Including Selenides and Tellurides

(2.10)where Am Bn Xp, with (m+n):p=3:4

(2.10.1)Linnaeite Group (Isometric: Fd3m)

2.10.1.1 Linnaeite CoCo2S4 F d3m 4/m 3 2/m

2.10.1.2 Carrollite Cu(Co,Ni)2S4 F d3m 4/m 3 2/m

2.10.1.3 Fletcherite Cu(Ni,Co)2S4 F d3m 4/m 3 2/m

2.10.1.4 Tyrrellite (Cu,Co,Ni)3Se4 F d3m 4/m 3 2/m

2.10.1.5 Bornhardtite CoCo2Se4 F d3m 4/m 3 2/m

2.10.1.6 Siegenite (Ni,Co)3S4 F d3m 4/m 3 2/m

2.10.1.7 Polydymite NiNi2S4 F d3m 4/m 3 2/m

2.10.1.8 Violarite FeNi2S4 F d3m 4/m 3 2/m

2.10.1.9 Trustedtite Ni3Se4 F d3m 4/m 3 2/m

2.10.1.10 Greigite FeFe2S4 F d3m 4/m 3 2/m

2.10.1.11 Daubreelite FeCr2S4 F d3m 4/m 3 2/m

2.10.1.12 Indite FeIn2S4 F d3m 4/m 3 2/m

2.10.1.13 Kalininite ZnCr2S4 F d3m 4/m 3 2/m

2.10.1.14 Florensovite Cu(Cr1.5Sb0.5)S4 F d3m 4/m 3 2/m

2.10.1.15 Cuproiridsite CuIr2S4 F d3m 4/m 3 2/m

2.10.1.16 Cuprorhodsite CuRh2S4 F d3m 4/m 3 2/m

2.10.1.17 Malanite Cu(Pt,Ir)2S4 F d3m 4/m 3 2/m

2.10.1.18 Ferrorhodsite (Fe,Cu)(Rh,Ir,Pt)2S4 F d3m 4/m 3 2/m

2.10.1.19 Cadmoindite! CdIn2S4 F d3m 4/m 3 2/m

Strunz Class:

II/D.01-30 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.01 - Linneite group and related compounds

II/D.01-10 Greigite FeFe2S4 F d3m 4/m 3 2/m

II/D.01-20 Linnaeite CoCo2S4 F d3m 4/m 3 2/m

II/D.01-30 Polydymite NiNi2S4 F d3m 4/m 3 2/m

II/D.01-40 Carrollite Cu(Co,Ni)2S4 F d3m 4/m 3 2/m

II/D.01-50 Fletcherite Cu(Ni,Co)2S4 F d3m 4/m 3 2/m

II/D.01-60 Florensovite Cu(Cr1.5Sb0.5)S4 F d3m 4/m 3 2/m

II/D.01-70 Violarite FeNi2S4 F d3m 4/m 3 2/m

II/D.01-80 Siegenite (Ni,Co)3S4 F d3m 4/m 3 2/m

II/D.01-90 Indite FeIn2S4 F d3m 4/m 3 2/m

II/D.01-95 Cadmoindite! CdIn2S4 F d3m 4/m 3 2/m

II/D.01-100 Daubreelite FeCr2S4 F d3m 4/m 3 2/m

II/D.01-110 Kalininite ZnCr2S4 F d3m 4/m 3 2/m

II/D.01-120 Bornhardtite CoCo2Se4 F d3m 4/m 3 2/m

II/D.01-130 Trustedtite Ni3Se4 F d3m 4/m 3 2/m

II/D.01-140 Tyrrellite (Cu,Co,Ni)3Se4 F d3m 4/m 3 2/m

Other Polydymite Information

References:

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

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Polydymite

NiNi2S4
Dana No: 2.10.1.7 Strunz No: II/D.01-30
Locality:

Notes: