Mineralogy Database

Dessauite Mineral Data

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General Dessauite Information

Help on Chemical  Formula: Chemical Formula: (Sr,Pb)(Y,U)(Ti,Fe+++)20O38
Help on Composition: Composition: Molecular Weight = 1,856.57 gm
   Strontium   3.54 %  Sr    4.19 % SrO
   Yttrium     3.35 %  Y     4.26 % Y2O3
   Uranium     3.85 %  U     4.36 % UO2
   Titanium   38.68 %  Ti   64.54 % TiO2
   Iron       15.04 %  Fe   21.50 % Fe2O3
   Lead        2.79 %  Pb    3.01 % PbO
   Oxygen     32.75 %  O
             ______        ______ 
             100.00 %      101.85 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Sr0.75Pb0.25Y0.7U0.3Ti15Fe3+5O38
Help on Environment: Environment: In calcite veins within dolomite. A member of the Crichtonite group.
Help on IMA Status: IMA Status: Approved IMA 1997 (Dana # Added)
Help on Locality: Locality: The Buca della Vena mine, Apuan Alps, near the town of Stazzema, northern Tuscany, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Gabor Dessau (1907-1983), professor of ore mineralogy at the University of Pisa, Italy.
Help on Name Pronunciation: Name Pronunciation: Dessauite + Pronunciation Say DESSAUITE
Help on Synonym: Synonym: ICSD 77505
  IMA1994-057
  Romanite
 

Dessauite Image

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  Dessauite

Comments: SEM photograph of tabular {001} dessauite crystals on calcite. (AmMin v82:807).
Location: Buca della Vena mine, Tuscany, Italy. Scale: Scale bar: 0 .1mm.
© American Mineralogist

Dessauite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.01454
Help on Cell Dimensions: Cell Dimensions: a = 10.385, c = 20.921, Z = 3; V = 1,954.01 Den(Calc)= 4.73
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: P 3
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 0 0) ( 0 0 1)

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Physical Properties of Dessauite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 4.68
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6.5-7 - Pyrite-Quartz
Help on Luster: Luster: Metallic
Help on Streak: Streak: black
 

Optical Properties of Dessauite

Help on Optical Data: Optical Data: NCalc= 2.62 - from Gladstone-Dale relationship (KC = 0.343) where Ncalc=Dcalc*KC+1
NCalc= 2.61 - from Gladstone-Dale relationship (KC = 0.343) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on RL Bireflectance: RL Bireflectance: Low.
Help on RL Color: RL Color: Ash gray with pale blue tones.
Help on RL Pleochroism: RL Pleochroism: Very weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Dessauite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   17.30   17.70 
   
 546 nm   16.60   17.10 
 589 nm   16.10   16.60 
 650 nm   16.00   16.50 
Standardized Intensity (100%) Reflection Spectra of Dessauite in Oil
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm    5.60    6.00 
   
 546 nm    5.00    5.50 
 589 nm    4.80    5.30 
 650 nm    4.60    5.10 
Calculated Relative Intensity Colors of Dessauite in Air
Relative
Intensity
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540% 550%
R1                        
R2                        
Calculated Relative Intensity Colors of Dessauite in Oil
Relative
Intensity
   0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000%
R1                      
R2                      
 

Calculated Properties of Dessauite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.42 gm/cc
note: Specific Gravity of Dessauite =4.73 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEDessauite = 158.61 barns/electron
U=PEDessauite x relectron= 701.41 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 306,522.05 (Gamma Ray American Petroleum Institute Units)
Concentration of Dessauite per GRapi unit = 3.26 (PPM)

Dessauite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 99.23 ± 24.81 grams of pure Dessauite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 9923.2 ±2480.8 grams of pure Dessauite .

Estimated Radioactivity from Dessauite - strong
Specimen
Size
Weight/Volume
(Sphere)
*
Calculated
Activity
Bequerols
(Bq)
Calculated
Activity
Curies (Ci)
Estimated
Activity
GR(api)
Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 7.39 cm 6,884,821 1.86E-04 306,522.05 100.77
100 gm / 3.43 cm 688,482 1.86E-05 30,652.21 10.08
10 gm / 1.59 cm 68,848 1.86E-06 3,065.22 1.01
1 gm / 7.39 mm 6,885 1.86E-07 306.52 0.10
0.1 gm / 3.43 mm 688 1.86E-08 30.65 0.01
0.01 gm / 1.59 mm 69 1.86E-09 3.07 0.00
0.001 gm / 0.74 mm 7 1.86E-10 0.31 0.00

Weight of pure Dessauite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.73 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
 

Dessauite Classification

Help on  Dana Class: Dana Class: 08.05.01.09 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.05)Dana Type
  (08.05.01)Crichtonite group (ABC18 T2 O38)
 
08.05.01.01 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
08.05.01.02 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
08.05.01.03 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
08.05.01.04 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3
 
08.05.01.05 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
08.05.01.06 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
08.05.01.07 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
08.05.01.08 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
08.05.01.09 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
08.05.01.10 Cleusonite! Pb(U,U)(Ti,Fe,Fe)20(O,OH)38 R 3 3
 
08.05.01.11 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
Help on  Strunz Class: Strunz Class: 04.CC.40 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.C - Metal:Oxygen = 2:3, 3:5, and Similar
  04.CC -With large and medium-sized cations
 
04.CC.40 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
04.CC.40 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
04.CC.40 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
04.CC.40 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
04.CC.40 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
04.CC.40 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
04.CC.40 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
04.CC.40 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
04.CC.40 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3
 
04.CC.40 Cleusonite! Pb(U,U)(Ti,Fe,Fe)20(O,OH)38 R 3 3
 
04.CC.40 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
 

Other Dessauite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.82,p807-811,1997) OPTIC PROP.(MinRec, v 29, p 235)
Help on See Also: See Also: Links to other databases for Dessauite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info
12 - Uranium Minerals
13 - WWW-MINCRYST

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Print or Cut-and-Paste your Dessauite Specimen Label here :

Dessauite

(Sr,Pb)(Y,U)(Ti,Fe+++)20O38
Dana No: 08.05.01.09 Strunz No: 04.CC.40
Locality:

 

Notes:

 

 
   
 


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