Derbylite
A valid IMA mineral species - grandfathered
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About Derbylite
Orville Adelbert Derby
Formula:
Fe3+4Ti3Sb3+O13(OH)
also given as Fe2+xFe3+4-2xTi4+3+xSb3+O13(OH)
Colour:
Pitch-black, dark brown (when translucent)
Lustre:
Sub-Adamantine, Resinous, Metallic
Hardness:
5
Specific Gravity:
4.53 - 4.62
Crystal System:
Monoclinic
Name:
After American geologist Orville Adelbert Derby [July 23, 1851 Kellogsville, New York - November 27, 1915 Rio de Janeiro, Brazil), former Director, Brazilian Geological Survey.
Type Locality:
Homeotypic with graeserite, its As analogue. Both crystallize in the same point group, but different space group.
Also the Fe-Sb analogue of tomichite.
Compare batisivite.
Also the Fe-Sb analogue of tomichite.
Compare batisivite.
Unique Identifiers
Mindat ID:
1263
Long-form identifier:
mindat:1:1:1263:4
GUID
(UUID V4):
(UUID V4):
8a7a99ad-d2ae-46a5-8b5b-226b3da495c0
IMA Classification of Derbylite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Fe3+4Ti4+3Sb3+O13(OH)
First published:
1897
Classification of Derbylite
4.JB.55
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O
46.2.3.2
46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
2 : Miscellaneous
46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
2 : Miscellaneous
24.3.2
24 : Antimonates and Antimonites
3 : Antimonates of Ti and Pb
24 : Antimonates and Antimonites
3 : Antimonates of Ti and Pb
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Dby | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Derbylite
Sub-Adamantine, Resinous, Metallic
Transparency:
Opaque
Colour:
Pitch-black, dark brown (when translucent)
Streak:
Brown
Hardness:
5 on Mohs scale
Hardness:
VHN100=1033 - 1121 kg/mm2 - Vickers
Tenacity:
Very brittle
Cleavage:
None Observed
Fracture:
Conchoidal, Sub-Conchoidal
Density:
4.53 - 4.62 g/cm3 (Measured) 4.76 g/cm3 (Calculated)
Optical Data of Derbylite
Type:
Biaxial (+)
RI values:
nα = 2.450 nβ = 2.450 nγ = 2.510
Birefringence:
0.06
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Optical Extinction:
X = a; Y = b; Z = c.
Reflectivity:
| Wavelength | R1 | R2 |
|---|---|---|
| 400nm | 22.1% | 23.6% |
| 420nm | 21.3% | 22.8% |
| 440nm | 20.5% | 22.0% |
| 460nm | 19.8% | 21.2% |
| 480nm | 19.2% | 20.4% |
| 500nm | 18.8% | 19.9% |
| 520nm | 18.4% | 19.6% |
| 540nm | 18.1% | 19.3% |
| 560nm | 17.8% | 19.0% |
| 580nm | 17.6% | 18.7% |
| 600nm | 17.4% | 18.5% |
| 620nm | 17.3% | 18.4% |
| 640nm | 17.1% | 18.2% |
| 660nm | 16.9% | 18.0% |
| 680nm | 16.8% | 17.8% |
| 700nm | 16.7% | 17.7% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 23.6%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Gray
Internal Reflections:
Bluish green
Pleochroism:
Non-pleochroic
Chemistry of Derbylite
Mindat Formula:
Fe3+4Ti3Sb3+O13(OH)
also given as Fe2+xFe3+4-2xTi4+3+xSb3+O13(OH)
also given as Fe2+xFe3+4-2xTi4+3+xSb3+O13(OH)
Crystallography of Derbylite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 7.156 Å, b = 14.347 Å, c = 4.97 Å
β = 104.69°
β = 104.69°
Ratio:
a:b:c = 0.499 : 1 : 0.346
Unit Cell V:
493.58 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals prismatic, elongated [001], exhibiting numerous forms, mostly {hk0}; small grains.
Twinning:
On {011} or {153}. Commonly as cruciform twins crossing at 57°38½', and rarely as trillings.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
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View
CIF File Best | x | y | z | a | b | c
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014704 | Derbylite | Moore P B, Araki T (1976) Derbylite, Fe3+4Ti4+3Sb3+O13(OH), a novel close-packed oxide structure Neues Jahrbuch fur Mineralogie, Abhandlungen 126 292-303 | 1976 | Ouro Preto, Minas Gerias, Brazil | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.00 Å | (20) |
| 3.83 Å | (20) |
| 3.19 Å | (50) |
| 3.12 Å | (40) |
| 2.85 Å | (100) |
| 2.67 Å | (80) |
| 2.48 Å | (30) |
| 2.39 Å | (30) |
Comments:
35-599
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 57 : Other minerals formed by human processes |
Type Occurrence of Derbylite
General Appearance of Type Material:
Small grains and complex prismatic crystals.
Place of Conservation of Type Material:
The Natural History Museum, London, England, UK: #80143.
Geological Setting of Type Material:
Cinnabar-bearing placer gravels.
Associated Minerals at Type Locality:
Reference:
Hussak, E., Prior, G.T. (1897) On derbylite, a new antimono-titanate of iron from Tripuhy, Brazil. Mineralogical Magazine: 11: 176-179.
Other Language Names for Derbylite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 4.JB. | Cuyaite | Ca2Mn3+As3+14O24Cl |
| 4.JB. | Brattforsite | Mn19(AsO 3)12Cl2 |
| 4.JB.05 | Fetiasite | (Fe3+,Fe2+,Ti)3(As2O5)O2 |
| 4.JB.10 | Manganarsite | Mn3(As2O4)(OH)4 |
| 4.JB.15 | Magnussonite | Mn2+10(As3+O3)6(OH,Cl)2 |
| 4.JB.15 | UM1984-09-AsO:ClHMn | Mn10As6O18(OH)Cl |
| 4.JB.20 | Armangite | Mn2+26(AsO3)14(HAsO3)4(CO3) |
| 4.JB.25 | Nanlingite | Na(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14 |
| 4.JB.30 | Asbecasite | Ca3(Ti,Sn4+)Be2(AsO3)6(SiO4)2 |
| 4.JB.35 | Stenhuggarite | CaFeSb(AsO3)2O |
| 4.JB.40 | Trigonite | Pb3Mn2+(AsO3)2(HAsO3) |
| 4.JB.45 | Finnemanite | Pb5(AsO3)3Cl |
| 4.JB.50 | Gebhardite | Pb8(As2O5)2OCl6 |
| 4.JB.55 | Tomichite | (V,Fe)4Ti3AsO13(OH) |
| 4.JB.55 | Graeserite | Fe3+4Ti3As3+O13(OH) |
| 4.JB.60 | Hemloite | (Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH) |
| 4.JB.65 | Freedite | Cu+Pb8(AsO3)2O3Cl5 |
| 4.JB.70 | Georgiadesite | Pb4(As3+O3)Cl4(OH) |
| 4.JB.75 | Ekatite | (Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6 |
| 4.JB.75 | Szklaryite | ◻Al6BAs3+3O15 |
| 4.JB.85 | Lepageite | Mn2+3(Fe3+7Fe2+4)O3[Sb3+5As3+8O34] |
| 4.JB.90 | Bianchiniite | Ba2(TiV)(As2O5)2OF |
Fluorescence of Derbylite
Not fluorescent
Other Information
Notes:
Not soluble in acids. Decomposed by fusion in KHSO4.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Derbylite
mindat.org URL:
https://www.mindat.org/min-1263.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Derbylite
Reference List:
Hussak, E., Prior, G. T. (1897) On Derbylite, a New Antimono-titanate of Iron, from Tripuhy, Brazil. Mineralogical Magazine and Journal of the Mineralogical Society, 11 (52) 176-179 doi:10.1180/minmag.1897.011.52.03
Larsen, Esper S. (1921) The microscopic determination of the nonopaque minerals. Bulletin Vol. 679. US Geological Survey doi:10.3133/b679 p.67
Mellini,, M., Orlandi, P., Perchiazzi, N. (1983) Derbylite from Buca della Vena mine, Apuane Alps, Italy. The Canadian Mineralogist, 21 (3) 513-516
Mellini, M., Orlandi, P., Vezzalini, G. (1986) V-bearing derbylite from the Buca della Vena mine, Apuan Alps, Italy. Mineralogical Magazine, 50 (356) 328-331 doi:10.1180/minmag.1986.050.356.22
Criddle, A. J., Stanley, C. J. (1993) Data file. In Quantitative Data File for Ore Minerals. Springer Netherlands. p.1-635. doi:10.1007/978-94-011-1486-8_1p.138
Localities for Derbylite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Brazil (TL) | |
| Mineralogical Magazine (1895) +3 other references |
| Brugger et al. (1997) | |
Italy | |
| Mellini et al. (1986) |
| Biagioni et al. (2013) +1 other reference |
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Buca della Vena Mine, Pontestazzemese, Stazzema, Lucca Province, Tuscany, Italy