Derbylite Mineral Data

Derbylite Mineral Data
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General Derbylite Information

Help on Chemical Formula: Chemical Formula: (Fe+++,Fe++,Ti)7Sb+++O13(OH)
Help on Composition: Composition: Molecular Weight = 721.74 gm
   Titanium  13.27 %  Ti   22.13 % TiO2
   Iron      38.69 %  Fe   19.91 % FeO / 33.19 % Fe2O3
   Antimony  16.87 %  Sb   20.19 % Sb2O3
   Hydrogen   0.14 %  H     1.25 % H2O
   Oxygen    31.03 %  O
            ______        ______ 
            100.00 %       96.67 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+3Fe2+2Ti2SbO13(OH)
Help on Environment: Environment: In cinnaber-bearing placer gravels.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1897
Help on Locality: Locality: Tripuhy, Ouro Preto, Minas Gerais, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the American Geologist Orville A. Derby 1851 - 1915 founder of the Brazilian Geological Survey.
Help on Name Pronunciation: Name Pronunciation: Derbylite + Pronunciation Say DERBYLITE
Help on Synonym: Synonym: ICSD 9825
  PDF 35-599
 

Derbylite Image

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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

Derbylite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.499:1:0.3464
Help on Cell Dimensions: Cell Dimensions: a = 7.16, b = 14.347, c = 4.97, Z = 2; beta = 104.61° V = 494.03 Den(Calc)= 4.85
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.853(1), 2.674(0.73), 3.186(0.43),
Click Here for Large Derbylite Structure Window Crystal Structure:

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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

 

Physical Properties of Derbylite

Help on Cleavage: Cleavage: None
Help on Color: Color: Pitch black, Black, Dark brown.
Help on Density: Density: 4.5 - 4.6, Average = 4.55
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Resinous - Metallic
Help on Streak: Streak: brownish black
 

Optical Properties of Derbylite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.178 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.105 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3031,KPDmeas= 0.3231,KC= 0.2742
Ncalc = 2.23 - 2.33
Help on Optical Data: Optical Data: Biaxial (+), a=2.45, b=2.45, g=2.51, bire=0.0600, 2V(Calc)=0, 2V(Meas)=~0.
Help on RL Color: RL Color: Gray with bluish green internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Derbylite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   22.10   23.60 
   
 420 nm   21.30   22.80 
 440 nm   20.50   22.00 
 460 nm   19.80   21.20 
 480 nm   19.20   20.40 
 500 nm   18.80   19.90 
 520 nm   18.40   19.60 
 540 nm   18.10   19.30 
 560 nm   17.80   19.00 
 580 nm   17.60   18.70 
 600 nm   17.40   18.50 
 620 nm   17.30   18.40 
 640 nm   17.10   18.20 
 660 nm   16.90   18.00 
 680 nm   16.80   17.80 
 700 nm   16.70   17.70 
Calculated Relative Intensity Colors of Derbylite in Air
Relative
Intensity		    0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 500%
R1                      
R2                      
 

Calculated Properties of Derbylite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.54 gm/cc
note: Specific Gravity of Derbylite =4.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEDerbylite = 67.25 barns/electron
U=PEDerbylite x rElectron Density= 305.47 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Derbylite is Not Radioactive
 

Derbylite Classification
Help on Dana Class: Dana Class: 46.02.03.02 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites
  (46.02)with miscellaneous formulae
  (46.02.03)Derbylite Group
 
46.02.03.01 Tomichite (V,Fe)4Ti3AsO13(OH) A2/m 2/m
 
46.02.03.02 Derbylite (Fe,Fe,Ti)7SbO13(OH) P 21/m 2/m
 
46.02.03.03 Graeserite! (Fe,Ti)4Ti3AsO13(OH) A2/m 2/m
Help on Strunz Class: Strunz Class: 04.JB.55 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JB -Arsenites, antimonites, bismuthites; with additional anions, without H2O
 
04.JB.55 Derbylite (Fe,Fe,Ti)7SbO13(OH) P 21/m 2/m
 
04.JB.55 Graeserite! (Fe,Ti)4Ti3AsO13(OH) A2/m 2/m
 
04.JB.55 Tomichite (V,Fe)4Ti3AsO13(OH) A2/m 2/m
 

Other Derbylite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Derbylite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Derbylite

(Fe+++,Fe++,Ti)7Sb+++O13(OH)
Dana No: 46.02.03.02 Strunz No: 04.JB.55
Locality:

 

Notes: