Fletcherite Mineral Data

Fletcherite Mineral Data +

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General Fletcherite Information

Chemical Formula:

Cu(Ni,Co)2S4

Composition:

Molecular Weight = 309.31 gm

Cobalt 9.53 % Co

Copper 20.54 % Cu

Nickel 28.46 % Ni

Sulfur 41.47 % S

______

100.00 %

Empirical Formula:

CuNi_1.5Co_0.5S₄

Environment:

Found disseminated in copper sulfides, in copper-rich pods replacing dolostone.

IMA Status:

Approved IMA 1977

Locality:

At the Fletcher mine, Reynolds Co., Missouri, USA. Link to MinDat.org Location Data.

Name Origin:

For the Fletcher mine, Reynolds Co., Missouri, USA.

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Fletcherite Crystallography

Cell Dimensions:

a = 9.52, Z = 8; V = 862.80 Den(Calc)= 4.76

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): 1.68(1), 1.83(0.6), 2.87(0.5),

Physical Properties of Fletcherite

Color:

Steel gray.

Diaphaniety:

Opaque

Hardness:

5 - Apatite

Luster:

Metallic

Optical Properties of Fletcherite

RL Color:

Creamy white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Fletcherite in Air**
λ	R	∑ R(λ)
420 nm	36.40
460 nm	40.90
500 nm	42.50
546 nm	43.40
589 nm	45.30
640 nm	43.80

**Calculated Relative Intensity Colors of Fletcherite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	230%
R

Calculated Properties of Fletcherite

Electron Density:

r_electron=4.57 gm/cc
note: r_Fletcherite=4.76 gm/cc.

Fermion Index

Fermion Index = 0.00632
Boson Index = 0.99368

Photoelectric:

PE_Fletcherite= 26.00 barns/electron
U=PE_Fletcherite x r_electron= 118.84 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fletcherite is Not Radioactive

Fletcherite Classification

Dana Class:

2.10.1.3 (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.01-50 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 Fletcherite 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 Fletcherite Specimen Label here :

Fletcherite

Cu(Ni,Co)2S4
Dana No: 2.10.1.3 Strunz No: II/D.01-50
Locality:

Notes: