General Derbylite Information
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Chemical Formula: |
(Fe+++,Fe++,Ti)7Sb+++O13(OH) |
Composition: |
Molecular Weight = 721.74 gm |
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Titanium 13.27 % Ti 22.13 % TiO2 |
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Iron 38.69 % Fe 19.91 % FeO / 33.19 % Fe2O3 |
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Antimony 16.87 % Sb 20.19 % Sb2O3 |
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Hydrogen 0.14 % H 1.25 % H2O |
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Oxygen 31.03 % O |
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______ ______ |
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100.00 % 96.67 % = TOTAL OXIDE |
Empirical Formula: |
Fe3+3Fe2+2Ti2SbO13(OH) |
Environment: |
In cinnaber-bearing placer gravels. |
IMA Status: |
Valid Species (Pre-IMA) 1897 |
Locality: |
Tripuhy, Ouro Preto, Minas Gerais, Brazil. Link to MinDat.org Location Data. |
Name Origin: |
Named after the American Geologist Orville A. Derby 1851 - 1915 founder of the Brazilian Geological Survey. |
Synonym: |
ICSD 9825 |
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PDF 35-599 |
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Derbylite Image |
Images:
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Derbylite
Comments: Small black crystals of derbylite in matrix.
Location: Buca della Vena Mine, Stazzema (Ponte Stazzemese), Versilia, Apuan Alps, Lucca Province, Tuscany, Italy.
Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag |
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Derbylite Crystallography
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Axial Ratios: |
a:b:c =0.499:1:0.3464 |
Cell Dimensions: |
a = 7.16, b = 14.347, c = 4.97, Z = 2; beta = 104.61° V = 494.03 Den(Calc)= 4.85 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m |
X Ray Diffraction: |
By Intensity(I/Io): 2.853(1), 2.674(0.73), 3.186(0.43), |
Crystal Structure:
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drag2 - RMB Resize/Rotate
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Moore P B , Araki T , Neues Jahrbuch fur Mineralogie, Abhandlungen , 126 (1976) p.292-303, Derbylite, Fe3+4Ti4+3Sb3+O13(OH), a novel close-packed oxide structure, Locality: Ouro Preto, Minas Gerias, Brazil
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Physical Properties of Derbylite
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Cleavage: |
None |
Color: |
Pitch black, Black, Dark brown. |
Density: |
4.5 - 4.6, Average = 4.55 |
Diaphaniety: |
Opaque |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Hardness: |
5 - Apatite |
Luster: |
Resinous - Metallic |
Streak: |
brownish black |
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Optical Properties of Derbylite
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Optical Data: |
Biaxial (+), a=2.45, b=2.45, g=2.51, bire=0.0600, 2V(Calc)=0, 2V(Meas)=~0. |
RL Color: |
Gray with bluish green internal reflections. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Derbylite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
22.10 |
23.60 |

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| 420 nm |
21.30 |
22.80 |

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| 440 nm |
20.50 |
22.00 |

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| 460 nm |
19.80 |
21.20 |

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| 480 nm |
19.20 |
20.40 |

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| 500 nm |
18.80 |
19.90 |

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| 520 nm |
18.40 |
19.60 |

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| 540 nm |
18.10 |
19.30 |

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| 560 nm |
17.80 |
19.00 |

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| 580 nm |
17.60 |
18.70 |

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| 600 nm |
17.40 |
18.50 |

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| 620 nm |
17.30 |
18.40 |

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| 640 nm |
17.10 |
18.20 |

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| 660 nm |
16.90 |
18.00 |

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| 680 nm |
16.80 |
17.80 |

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| 700 nm |
16.70 |
17.70 |

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Calculated Relative Intensity Colors of Derbylite in Air
Relative Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
450% |
500% |
| R1 |
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Calculated Properties of Derbylite
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Electron Density: |
relectron=4.54 gm/cc note: rDerbylite =4.85 gm/cc. |
Fermion Index |
Fermion Index = 0.0255 Boson Index = 0.9745 |
Photoelectric: |
PEDerbylite = 67.25 barns/electron U=PEDerbylite x relectron= 305.47 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Derbylite is Not Radioactive |
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Derbylite Classification
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Dana Class: |
46.2.3.2 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites |
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(46.2)with miscellaneous formulae |
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(46.2.3)Derbylite Group |
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46.2.3.1 Tomichite (V,Fe)4Ti3AsO13(OH) A2/m 2/m |
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46.2.3.2 Derbylite (Fe,Fe,Ti)7SbO13(OH) P 21/m 2/m |
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46.2.3.3 Graeserite! (Fe,Ti)4Ti3AsO13(OH) A2/m 2/m |
Strunz Class: |
IV/C.23-30 IV - Oxides |
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IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds) |
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IV/C.23 - Hemloite - Derbylite series |
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IV/C.23-10 Hemloite (As,Sb)2(Ti,V,Fe,Al)12O23OH P1 1 |
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IV/C.23-15 Graeserite! (Fe,Ti)4Ti3AsO13(OH) A2/m 2/m |
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IV/C.23-20 Tomichite (V,Fe)4Ti3AsO13(OH) A2/m 2/m |
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IV/C.23-30 Derbylite (Fe,Fe,Ti)7SbO13(OH) P 21/m 2/m |
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Other Derbylite Information
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References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3) |
See Also: |
Links to other databases for Derbylite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (UofA)
7 -MinDAT
8 -MinMax(Deutsch)
9 -MinMax(English)
10 -Mineralienatlas (Deutsch)
11 -QUT Mineral Atlas
12 - WWW-MINCRYST
13 -École des Mines de Paris
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Print or Cut-and-Paste your Derbylite Specimen Label here :
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Derbylite
(Fe+++,Fe++,Ti)7Sb+++O13(OH)
Dana No: 46.2.3.2 Strunz No: IV/C.23-30
Locality:
Notes:
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