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Dessauite-(Y)

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Madonna valley, Premolo, Seriana Valley, Bergamo Province, Lombardy, Italy
© Enrico Bonacina




Formula:
(Sr,Pb)(Y,U)(Ti,Fe
3+
 
)
 
20
O
 
38
System:TrigonalColour:black
Lustre:MetallicHardness:6½ - 7
Member of:Crichtonite Group
Name:For Gabor Dessau (1907-1983), professor of ore mineralogy at the University of Pisa, Italy.


A member of the Crichtonite Group.

Classification of Dessauite-(Y)

IMA status:Approved 1994
Strunz 8th edition ID:4/C.09-45
Nickel-Strunz 10th (pending) edition ID:4.CC.40

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
C : With large and medium-sized cations
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Type Occurrence of Dessauite-(Y)

Type Locality:Buca della Vena Mine, Ponte Stazzemese, Stazzema, Apuan Alps, Lucca Province, Tuscany, Italy
General Appearance of Type Material:Small, flattened rhombohedral xls, tabular, with hexagonal outline. Dimensions: diameter up to 1 mm, thickness up to 0.2 mm.
Place of Conservation of Type Material:Museo di Storia Naturale e del Territorio, University of Pisa, (catalog no. 16385).
Geological Setting of type material:Calcite veins hosted within dolomitic marble ("Grezzoni" formation)

Physical Properties of Dessauite-(Y)

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:black
Hardness (Mohs):6½ - 7
Hardness (Vickers):VHN100=1105 - 1782
Cleavage:None Observed
Fracture:Conchoidal
Density (calculated):4.68 g/cm3

Crystallography of Dessauite-(Y)

Crystal System:Trigonal
Class (H-M):3 - Rhombohedral
Space Group:R3
Cell Parameters:a = 9.197Å
α = 68.75°
Unit Cell Volume:V 0.00 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
3.412 (m)
3.064 (vw)
2.998 (w)
2.902 (m)
2.846 (mw)
2.758 (vw)
2.624 (vw)
2.499 (mw)
2.431 (vw)
2.250 (w)
2.140 (w)
1.916 (mw)
1.805 (mw)
1.712 (vw)
1.603 (m)
1.548 (w)
1.511 (w)
1.441 (m)
Comments:Intensity observed.

Optical Data of Dessauite-(Y)

Type:Anisotropic
Anisotropism:weak
Bireflectance:low
Colour in reflected light:ash grey with pale bluish tones
Internal Reflections:not observed
Pleochroism:Weak

Chemical Properties of Dessauite-(Y)

Formula:
(Sr,Pb)(Y,U)(Ti,Fe
3+
 
)
 
20
O
 
38
Essential elements:O, Sr, Ti, Y
All elements listed in formula:Fe, O, Pb, Sr, Ti, U, Y
Analytical Data:Electron microprobe analysis (average of 17 points). 
V2O5 (0.89)
TiO2 (55,71)
ThO2 (0.11)
UO2 (4.52)
Al2O3 (0.08)
Cr2O3 (0.21)
Fe2O3 (27.24)
Y2O3 (2.02)
La2O3 (1.14)
Ce2O3 (0.68)
MgO (0.03)
CaO (0.12)
MnO (0.56)
ZnO (0.42)
SrO (2.34)
BaO (0.83)
PbO (3.18)

Total (100.08)
Empirical Formula:
(Sr
 
0.41
Pb
 
0
 ·
 
26
Ba
 
0.10
Ca
 
0.04
Th
 
0.01)
 (Y
 
0.33
U
 
0.31
Mn
 
0.14
La
 
0.13
Ce
 
0.08
) (Ti
 
12.78
Fe
 
6.25
V
 
0.189
Zn
 
0.0
Cr
 
0.05
Al
 
0.03
Mg
 
0.01)
 O
 
38

Relationship of Dessauite-(Y) to other Species

Member of:Crichtonite Group
Other Members of Group:

- +
Cleusonite
(Pb,Sr)(U
4+
 
,U
6+
 
)(Fe
2+
 
,Zn)
 
2
(Ti,Fe
2+
 
,Fe
3+
 
)
 
18
(O,OH)
 
38
Crichtonite
(Sr,La,Ce,Y)(Ti,Fe
3+
 
,Mn)
 
21
O
 
38
Davidite-(Ce)
(Ce,La)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
Davidite-(La)
(La,Ce)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
Davidite-(Y)
(Y,La,Ce,Na,Ca,Pb)(Y,Fe
2+
 
,◻)(Fe
2+
 
,Mn
2+
 
)
 
2
(Ti,Fe
3+
 
,Nb,Zr)
 
18
O
 
38
 (hypothetical)
Gramaccioliite-(Y)
(Pb,Sr)(Y,Mn)Fe
3+
2
(Ti,Fe
3+
 
)
 
18
O
 
38
Landauite
NaMnZn
 
2
(Ti,Fe)
 
6
Ti
 
12
O
 
38
Lindsleyite
(Ba,Sr)(Ti,Zr,Fe,Cr)
 
21
O
 
38
Loveringite
(Ca,Ce)(Ti,Fe,Cr,Mg)
 
21
O
 
38
Mathiasite
K(Ti,Cr,Fe,Mg,Zr)
 
21
O
 
38
Paseroite
PbMn
2+
 
(Fe
3+
 
,◻)
 
2
(V
5+
 
,Ti,◻)
 
18
O
 
38
Romanite
(◻,Pb,Ca)UFe
2+
2
(Ti,Fe
3+
 
)
 
6
Ti
 
12
O
 
38
Senaite
Pb(Ti,Fe,Mn)
 
21
O
 
38
Unnamed (HBU UK-4)
NaFe
2+
 
Zn
 
2
(Ti,Fe
3+
 
,Nb)
 
6
Ti
 
12
O
 
38
Related Minerals - Nickel-Strunz Grouping):

- +
4.CC.05Chrombismite
Bi
 
16
CrO
 
27
4.CC.10Freudenbergite
Na
 
2
(Ti,Fe)
 
8
O
 
16
4.CC.15Grossite
CaAl
 
4
O
 
7
4.CC.20Mayenite
Ca
 
12
Al
 
14
O
 
33
4.CC.20Brearleyite
Ca
 
12
Al
 
14
O
 
32
Cl
 
2
4.CC.25Yafsoanite
Ca
 
3
Zn
 
3
(TeO
 
6
)
 
2
4.CC.30Latrappite
(Ca,Na)(Nb,Ti,Fe)O
 
3
4.CC.30Lueshite
NaNbO
 
3
4.CC.30Natroniobite
NaNbO
 
3
4.CC.30Perovskite
CaTiO
 
3
4.CC.30Barioperovskite
BaTiO
 
3
4.CC.30Lakargiite
Ca(Zr,Sn,Ti)O
 
3
4.CC.30Megawite
CaSnO
 
3
4.CC.35Loparite-(Ce)
(Na,Ce,Ca,Sr,Th)(Ti,Nb,Fe)O
 
3
4.CC.35Macedonite
PbTiO
 
3
4.CC.35Tausonite
SrTiO
 
3
4.CC.35Isolueshite
(Na,La,Ca)(Nb,Ti)O
 
3
4.CC.40Crichtonite
(Sr,La,Ce,Y)(Ti,Fe
3+
 
,Mn)
 
21
O
 
38
4.CC.40Davidite-(Ce)
(Ce,La)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
4.CC.40Davidite-(La)
(La,Ce)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
4.CC.40Davidite-(Y)
(Y,La,Ce,Na,Ca,Pb)(Y,Fe
2+
 
,◻)(Fe
2+
 
,Mn
2+
 
)
 
2
(Ti,Fe
3+
 
,Nb,Zr)
 
18
O
 
38
 (hypothetical)
4.CC.40Landauite
NaMnZn
 
2
(Ti,Fe)
 
6
Ti
 
12
O
 
38
4.CC.40Lindsleyite
(Ba,Sr)(Ti,Zr,Fe,Cr)
 
21
O
 
38
4.CC.40Loveringite
(Ca,Ce)(Ti,Fe,Cr,Mg)
 
21
O
 
38
4.CC.40Mathiasite
K(Ti,Cr,Fe,Mg,Zr)
 
21
O
 
38
4.CC.40Senaite
Pb(Ti,Fe,Mn)
 
21
O
 
38
4.CC.40Cleusonite
(Pb,Sr)(U
4+
 
,U
6+
 
)(Fe
2+
 
,Zn)
 
2
(Ti,Fe
2+
 
,Fe
3+
 
)
 
18
(O,OH)
 
38
4.CC.40Gramaccioliite-(Y)
(Pb,Sr)(Y,Mn)Fe
3+
2
(Ti,Fe
3+
 
)
 
18
O
 
38
4.CC.45Diaoyudaoite
NaAl
 
11
O
 
17
4.CC.45Hawthorneite
Ba(MgTi
 
3
Cr
 
4
Fe
 
4
)O
 
19
4.CC.45Hibonite
(Ca,Ce)Al
 
12
O
 
19
4.CC.45Lindqvistite
Pb
 
2
(Mg,Fe)Fe
 
16
O
 
27
4.CC.45Magnetoplumbite
(Pb,Mn)(Fe,Mn)
 
12
O
 
19
4.CC.45Plumboferrite
Pb
 
2
Fe
3+
11-x
Mn
2+
x
O
 
19-2x
, x = 1/3
4.CC.45Yimengite
K(Cr,Ti,Fe,Mg)
 
12
O
 
19
4.CC.45Haggertyite
Ba[Fe
2+
6
Ti
 
5
Mg]O
 
19
4.CC.45Nežilovite
PbZn
 
2
(Mn
4+
 
,Ti
4+
 
)
 
2
Fe
3+
8
O
 
19
4.CC.45Batiferrite
Ba[Ti
 
2
Fe
3+
8
Fe
2+
2
]O
 
19
4.CC.45IMA2009-027
(Fe,Mg)Al
 
12
O
 
19
4.CC.45Barioferrite
BaFe
3+
12
O
 
19
4.CC.50Jeppeite
(K,Ba)
 
2
(Ti,Fe)
 
6
O
 
13
4.CC.55Zenzénite
Pb
 
3
(Fe,Mn)
 
4
Mn
 
3
O
 
13
4.CC.60Mengxianminite
(Ca,Na)
 
3
(Fe,Mn)
 
2
Mg
 
2
(Sn,Zn)
 
5
Al
 
8
O
 
29

Other Names for Dessauite-(Y)

Synonyms:
DessauiteIMA1994-057
Other Languages:
German:Dessauit
Russian:Дессауит-(Y)
Spanish:Dessauita

Other Information

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 Dessauite-(Y)

Reference List:

- +
Orlandi P., Pasero M., Duchi G., Olmi F., 1997. Dessauite, (Sr, Pb) (Y, U) (Ti, Fe3+)20 O38, a new mineral of the crichtonite group from Buca della Vena mine, Tuscany, Italy. American Minereralogist: 82: 807-811.

Mineralogical Record: 29: 234-235.

Internet Links for Dessauite-(Y)

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    • Localities for Dessauite-(Y)

    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.
    Italy
     
    • Lombardy
      • Sondrio Province
        • Malenco Valley
          • Lanzada
    		Bedognè, F. (2011). Microminerali della Valmalenco. Nuove segnalazioni e aggiornamenti. Rivista Mineralogica Italiana, 1/2011, 40-45
    • Piedmont
      • Cuneo Province
        • Stura Valley
    • Tuscany
      • Lucca Province
        • Apuan Alps
          • Stazzema
            • Ponte Stazzemese
    		Orlandi P., Pasero M., Duchi G., Olmi F., 1997. Dessauite, (Sr,Pb)(Y,U)(Ti,Fe3+)20 O38, a new mineral of the crichtonite group from Buca della Vena mine, Tuscany, Italy. Amer. Miner., 82: 807-811; Orlandi, P. & Pasero, M. (2006): Allanite-(La) from Buca della Vena mine, Apuan Alps, Italy, an epidote-group mineral. Canadian Mineralogist, 44, 63-68.
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