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Derbylite

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Big Photo

Buca della Vena Mine, Ponte Stazzemese, Stazzema, Apuan Alps, Lucca Province, Tuscany, Italy
© Cristian B.

Show Derbylite Photos (10)



Formula:
Fe
3+
4
Ti
 
3
Sb
3+
 
O
 
13
(OH)
System:MonoclinicColour:Pitch-black, dark brown ...
Hardness:5
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.
This page provides mineralogical data about Derbylite.

Classification of Derbylite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/C.23-30
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:46.2.3.2

46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
2 : Miscellaneous
Hey's CIM Ref.:24.3.2

24 : Antimonates and Antimonites
3 : Antimonates of Ti and Pb
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Type Occurrence of Derbylite

Type Locality:Tripuí (Tripuhy), Ouro Preto, Minas Gerais, Brazil
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.
Year of Discovery:1895
Geological Setting of type material:Cinnabar-bearing placer gravels
Associated Minerals at type locality:
ZirconXenotime-(Y)TripuhyiteRutileRoméite Group
MuscoviteMonaziteHematite

Physical Properties of Derbylite

Lustre:Sub-Adamantine, Resinous, Metallic
Diaphaneity (Transparency):Opaque
Colour:Pitch-black, dark brown (when translucent)
Streak:Brown
Hardness (Mohs):5
Hardness (Vickers):VHN100=1033 - 1121 kg/mm2
Tenacity:Very brittle
Cleavage:None Observed
Fracture:Conchoidal, Sub-Conchoidal
Density (measured):4.53 - 4.62 g/cm3
Density (calculated):4.76 g/cm3

Crystallography of Derbylite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}
Cell Parameters:a = 7.156Å, b = 14.347Å, c = 4.97Å
β = 104.69°
Ratio:a:b:c = 0.499 : 1 : 0.346
Unit Cell Volume: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.
X-Ray Powder Diffraction:
d-spacingIntensity
4.00 (20)
3.83 (20)
3.19 (50)
3.12 (40)
2.85 (100)
2.67 (80)
2.48 (30)
2.39 (30)
Comments:35-599

Optical Data of Derbylite

Type:Biaxial (+)
RI values: nα = 2.450 nβ = 2.450 nγ = 2.510
Birefringence:0.06
Maximum Birefringence:δ = 0.060

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Type:Anisotropic
Colour in reflected light:Gray
Internal Reflections:Bluish green
Pleochroism:Non-pleochroic

Chemical Properties of Derbylite

Formula:
Fe
3+
4
Ti
 
3
Sb
3+
 
O
 
13
(OH)
Essential elements:Fe, H, O, Sb, Ti
All elements listed in formula:Fe, H, O, Sb, Ti

Relationship of Derbylite to other Species

Common Associates:
VersiliaiteSphaleriteSchafarzikitePyriteDolomite
BournoniteBaryteApuanite
Related Minerals - Nickel-Strunz Grouping):

- +
4.JB.05Fetiasite
(Fe
3+
 
,Fe
2+
 
,Ti)
 
3
(As
 
2
O
 
5
)O
 
2
4.JB.10Manganarsite
Mn
 
3
(As
 
2
O
 
4
)(OH)
 
4
4.JB.15Magnussonite
Mn
 
10
As
 
6
O
 
18
(OH,Cl)
 
2
4.JB.15UM1984-09-AsO:ClHMn
Mn
 
10
As
 
6
O
 
18
(OH)Cl
4.JB.20Armangite
Mn
2+
26
(AsO
 
3
)
 
14
(HAsO
 
3
)
 
4
(CO
 
3
)
4.JB.25Nanlingite
NaMg
 
4
(AsO
 
3
)
 
2
F
 
4
4.JB.30Asbecasite
Ca
 
3
(Ti,Sn
4+
 
)Be
 
2
(AsO
 
3
)
 
6
(SiO
 
4
)
 
2
4.JB.35Stenhuggarite
CaFeSb(AsO
 
3
)
 
2
O
4.JB.40Trigonite
Pb
 
3
Mn
2+
 
(AsO
 
3
)
 
2
(HAsO
 
3
)
4.JB.45Finnemanite
Pb
 
5
(AsO
 
3
)
 
3
Cl
4.JB.50Gebhardite
Pb
 
8
(As
 
2
O
 
5
)
 
2
OCl
 
6
4.JB.55Tomichite
(V,Fe)
 
4
Ti
 
3
AsO
 
13
(OH)
4.JB.55Graeserite
(Fe
3+
 
,Ti)
 
4
Ti
 
3
AsO
 
13
(OH)
4.JB.60Hemloite
(Ti,V
3+
 
,Fe
3+
 
,Al)
 
12
(As
3+
 
,Sb
3+
 
)
 
2
O
 
23
(OH)
4.JB.65Freedite
Cu
+
 
Pb
 
8
(AsO
 
3
)
 
2
O
 
3
Cl
 
5
4.JB.70Georgiadèsite
Pb
 
4
(AsO
 
3
)Cl
 
4
(OH)
4.JB.75Ekatite
(Fe
3+
 
,Fe
2+
 
,Zn)
 
12
(AsO
 
3
)
 
6
(AsO
 
3
,HSiO
 
4
)
 
2
(OH)
 
6
Related Minerals - Hey's Index Grouping:

- +
24.3.3Hemloite
(Ti,V
3+
 
,Fe
3+
 
,Al)
 
12
(As
3+
 
,Sb
3+
 
)
 
2
O
 
23
(OH)
24.3.4Nadorite
PbSbClO
 
2
24.3.5Oxyplumboroméite
Pb
 
2
Sb
 
2
O
 
6
O
24.3.6Monimolite
24.3.7Thorikosite
Pb
 
3
Cl
 
2
(OH)(SbO
 
3
,AsO
 
3
)

Other Names for Derbylite

Other Languages:
German:Derbylit
Russian:Дербилит
Spanish:Derbylita

Other Information

Fluorescence in UV light:Not fluorescent
Other Information:Not soluble in acids. Decomposed by fusion in KHSO4.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Derbylite

Reference List:

- +
Hussak, E., Prior, G.T. (1897) On derbylite, a new antimono-titanate of iron from Tripuhy, Brazil. Mineralogical Magazine: 11: 176-179.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 147.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1025-1026.

Moore, P. B., Araki T. (1976) Derbylite, Fe3+ 4, Ti4+ 3 Sb3+ O13 (OH), a novel close-packed oxide structure. Neues Jahrb. Mineral. Abh., 126: 292-303.

American Mineralogist (1977): 62: 396 (abstract).

Mellini M., Orlandi P., Perchiazzi N., 1983. Derbylite from Buca della Vena mine, Apuan Alps, Italy. Canadian Mineralogist: 21: 513-516.

Criddle, A.J. and C.J. Stanley, Eds. (1993) Quantitative data file for ore minerals, 3rd ed. Chapman & Hall, London, 138.

Internet Links for Derbylite

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    • Localities for Derbylite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Brazil
     
    • Minas Gerais
      • Ouro Preto
    		Mineralogical Magazine (1895): 11: 85; Mineralogical Magazine (1897): 11: 176; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1026.; Hussak and Prior (1900) Mineralogical Magazine: 12: 244.
    Italy
     
    • Tuscany
      • Lucca Province
        • Apuan Alps
          • Stazzema
            • Ponte Stazzemese
    		Mellini M., Orlandi P., Vezzalini G (1986).: V-derbylite from Buca della Vena mine. Apuan Alps Italy . Mineralogical Magazine, 50, 328-330.
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