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Derbylite

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

Show Derbylite Photos (6)
Formula:
(Fe,Fe,Ti)
 
7
SbO
 
13
(OH)
System:MonoclinicColour:Pitch-black, dark brown ...
Hardness:5
Name:After American geologist Orville Adelbert Derby (1851-1915), 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 (Fazenda Tres Cruzes; Tripuhy), Ouro Preto, Minas Gerais, Southeast Region, 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
MuscoviteMonaziteHematite

Physical Properties of Derbylite

Lustre:Resinous, Metallic
Diaphaneity (Transparency):Translucent on thin edges, Opaque
Colour:Pitch-black, dark brown (when translucent)
Hardness (Mohs):5
Hardness (Vickers):VHN100=1033 - 1121 kg/mm2
Tenacity:Very brittle
Cleavage:None Observed
Fracture:Conchoidal
Density (measured):4.53 - 4.62 g/cm3
Density (calculated):4.5 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.

Optical Data of Derbylite

Type:Biaxial (+)
RI values: nα = 2.450 nβ = 2.450 nγ = 2.510
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
Colour in reflected light:Gray
Internal Reflections:Bluish green
Pleochroism:Non-pleochroic

Chemical Properties of Derbylite

Formula:
(Fe,Fe,Ti)
 
7
SbO
 
13
(OH)
Essential elements:Fe, H, O, Sb
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
[O
 
2
|As
 
2
O
 
5
]
4.JB.10Manganarsite
Mn
 
3
[(OH)
 
4
|As
 
2
O
 
4
]
4.JB.15Magnussonite
Mn
 
10
As
 
6
O
 
18
(OH,Cl)
 
2
4.JB.15UM1984-09
Mn
 
10
As
 
6
O
 
18
(OH)Cl
4.JB.20Armangite
Mn
2+
26
[CO
 
3
|(HAsO
 
3
)
 
4
|(AsO
 
3
)
 
14
]
4.JB.25Nanlingite
CaMg
 
4
[F
 
2
|AsO
 
3
]
 
2
4.JB.30Asbecasite
Ca
 
3
(Ti,Sn
4+
 
)Be
 
2
[(AsO
 
3
)
 
3
|SiO
 
4
]
 
2
4.JB.35Stenhuggarite
CaFeSbO(AsO
 
3
)
 
2
4.JB.40Trigonite
Pb
 
3
Mn
2+
 
[HAsO
 
3
|(AsO
 
3
)
 
2
]
4.JB.45Finnemanite
Pb
 
5
[Cl|(AsO
 
3
)
 
3
]
4.JB.50Gebhardite
Pb
 
8
[O|Cl
 
6
|(As
 
2
O
 
5
)
 
2
]
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
(As,Sb)
 
2
(Ti,V,Fe,Al)
 
12
O
 
23
OH
4.JB.65Freedite
Pb
 
15
(Cu,Fe
2+
 
)
 
3
[O
 
7
|Cl
 
10
|(AsO
 
3
)
 
4
]
4.JB.70Georgiadèsite
Pb
 
16
[(OH)
 
6
|Cl
 
14
|(AsO
 
4
)
 
4
]
4.JB.75Ekatite
(Fe
3+
 
,Fe
2+
 
,Zn)
 
12
(OH)
 
6
(AsO
 
3
)
 
6
[AsO
 
3
,HOSiO
 
3
]
 
2
Related Minerals - Hey's Index Grouping:

- +
24.3.1Lewisite
(Ca,Fe,Na)
 
2
(Sb,Ti)
 
2
(O,OH)
 
7
24.3.3Hemloite
(As,Sb)
 
2
(Ti,V,Fe,Al)
 
12
O
 
23
OH
24.3.4Nadorite
PbSb[O
 
2
|Cl]
24.3.5Bindheimite
Pb
 
2
Sb
 
2
O
 
6
(O,OH)
24.3.6Monimolite
(Pb,Ca,Fe)
 
3
Sb
 
2
O
 
7
24.3.7Thorikosite
Pb
 
3
[OH|(SbO
 
3
,AsO
 
3
)|Cl
 
2
]

Other Names for Derbylite

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

Other Information

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.

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    Localities for Derbylite

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    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.
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    (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
     
    • Southeast Region
      • 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.
    Italy
     
    • Tuscany
      • Lucca Province
        • Apuan Alps
          • Stazzema
    		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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