General Cubanite Information
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Chemical Formula: |
CuFe2S3 |
Composition: |
Molecular Weight = 271.44 gm |
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Iron 41.15 % Fe |
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Copper 23.41 % Cu |
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Sulfur 35.44 % S |
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______ |
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100.00 % |
Empirical Formula: |
CuFe2+2S3 |
Environment: |
High temperature hydrothermal veins. |
IMA Status: |
Valid Species (Pre-IMA) 1843 |
Locality: |
Barracanao, Cuba. Link to MinDat.org Location Data. |
Name Origin: |
Named after its locality. |
Synonym: |
Chalmersite |
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ICSD 67529 |
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PDF 47-1749 |
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Cubanite Image |
Images:
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Cubanite
Comments: Brassy, lustrous, cyclic-twinned cubanite on matrix.
Location: Henderson # 2 Mine, Chibougamau, Quebec, Canada.
Scale: 10x6 mm.
© Tom Loomis / Dakota Matrix |
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Cubanite Crystallography
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Axial Ratios: |
a:b:c =0.5814:1:0.561 |
Cell Dimensions: |
a = 6.46, b = 11.11, c = 6.233, Z = 4; V = 447.35 Den(Calc)= 4.03 |
Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcmn |
X Ray Diffraction: |
By Intensity(I/Io): 3.213(1), 3.49(0.68), 3.23(0.48), |
Forms:
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Forms:
[ 1 3 0]
[ 1 3 1]
[ 0 1 0]
[ 1 0 1]
[ 1 1 0]
[ 1 0 0]
[ 0 0 1]
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Crystal Structure:
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Buerger M J , American Mineralogist , 32 (1947) p.415-425, The crystal structure of cubanite
View Additional jPOWD Structure files for Cubanite
[1]
[2]
[3]
[4]
[5]
[6]
[7]
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Physical Properties of Cubanite
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Cleavage: |
None |
Color: |
Brass yellow, Bronze yellow. |
Density: |
4.7 |
Diaphaniety: |
Opaque |
Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). |
Habit: |
Striated - Parallel lines on crystal surface or cleavage face. |
Hardness: |
3.5 - Copper Penny |
Luminescence: |
Non-fluorescent. |
Luster: |
Metallic |
Magnetism: |
Strongly magnetic |
Streak: |
black |
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Optical Properties of Cubanite
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RL Anisotrophism: |
Distinctive. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Cubanite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
20.60 |
23.80 |

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| 420 nm |
23.60 |
27.70 |

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| 440 nm |
26.60 |
31.60 |

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| 460 nm |
29.20 |
34.70 |

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| 480 nm |
31.40 |
37.10 |

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| 500 nm |
33.40 |
39.00 |

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| 520 nm |
35.00 |
40.20 |

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| 540 nm |
36.30 |
41.00 |

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| 560 nm |
37.30 |
41.60 |

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| 580 nm |
38.30 |
42.00 |

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| 600 nm |
39.00 |
42.40 |

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| 620 nm |
39.80 |
42.80 |

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| 640 nm |
40.70 |
43.30 |

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| 660 nm |
41.60 |
43.80 |

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| 680 nm |
42.40 |
44.30 |

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| 700 nm |
43.30 |
44.60 |

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Calculated Relative Intensity Colors of Cubanite in Air
Relative Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
330% |
| R1 |
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| R2 |
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Calculated Properties of Cubanite
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Electron Density: |
relectron=3.83 gm/cc note: rCubanite =4.03 gm/cc. |
Fermion Index |
Fermion Index = 0.01138 Boson Index = 0.98862 |
Photoelectric: |
PECubanite = 24.86 barns/electron U=PECubanite x relectron= 95.22 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cubanite is Not Radioactive |
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Cubanite Classification
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Dana Class: |
2.9.13.1 (2)Sulfides - Including Selenides and Tellurides |
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(2.9)where Am Bn Xp, with (m+n):p=1:1 |
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(2.9.13)Dana Group |
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2.9.13.1 Cubanite CuFe2S3 Pcmn 2/m 2/m 2/m |
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2.9.13.2 Argentopyrite AgFe2S3 Pmmn 2/m 2/m 2/m |
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2.9.13.3 Isocubanite CuFe2S3 F m3m 4/m 3 2/m |
Strunz Class: |
II/C.14-20 II - Sulfides and sulphosalts |
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II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1 |
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II/C.14 - Cubanite series |
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II/C.14-10 Enargite Cu3AsS4 Pnm21 mm2 |
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II/C.14-15 Stibioenargite* Cu3(Sb,As)S4 Unk Ortho |
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II/C.14-20 Cubanite CuFe2S3 Pcmn 2/m 2/m 2/m |
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II/C.14-30 Sternbergite AgFe2S3 C mma 2/m 2/m 2/m |
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II/C.14-40 Argentopyrite AgFe2S3 Pmmn 2/m 2/m 2/m |
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Other Cubanite Information
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References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Cubanite :
1 -Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 -Athena
4 - Crocoite.com Mineral Locations
5 - EUROmin Project
6 - Glendale Community College
7 -Google Images
8 -Google Scholar
9 -Handbook of Mineralogy (UofA)
10 - HyperPhysics
11 -MinDAT
12 -MinMax(Deutsch)
13 -MinMax(English)
14 -Mineralienatlas (Deutsch)
15 - Minerals of Wisconsin
16 -QUT Mineral Atlas
17 - WWW-MINCRYST
18 -École des Mines de Paris
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Print or Cut-and-Paste your Cubanite Specimen Label here :
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Cubanite
CuFe2S3
Dana No: 2.9.13.1 Strunz No: II/C.14-20
Locality:
Notes:
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