General Dessauite Information
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Chemical Formula: |
(Sr,Pb)(Y,U)(Ti,Fe+++)20O38 |
Composition: |
Molecular Weight = 1,856.57 gm |
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Strontium 3.54 % Sr 4.19 % SrO |
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Yttrium 3.35 % Y 4.26 % Y2O3 |
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Uranium 3.85 % U 4.36 % UO2 |
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Titanium 38.68 % Ti 64.54 % TiO2 |
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Iron 15.04 % Fe 21.50 % Fe2O3 |
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Lead 2.79 % Pb 3.01 % PbO |
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Oxygen 32.75 % O |
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______ ______ |
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100.00 % 101.85 % = TOTAL OXIDE |
Empirical Formula: |
Sr0.75Pb0.25Y0.7U0.3Ti15Fe3+5O38 |
Environment: |
In calcite veins within dolomite. A member of the Crichtonite group. |
IMA Status: |
Approved IMA 1997 (Dana # Added) |
Locality: |
The Buca della Vena mine, Apuan Alps, near the town of Stazzema, northern Tuscany, Italy. Link to MinDat.org Location Data. |
Name Origin: |
For Gabor Dessau (1907-1983), professor of ore mineralogy at the University of Pisa, Italy. |
Synonym: |
ICSD 77505 |
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IMA1994-057 |
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Romanite |
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Images:
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Dessauite Crystallography
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Axial Ratios: |
a:c = 1:2.01454 |
Cell Dimensions: |
a = 10.385, c = 20.921, Z = 6; V = 1,954.01 Den(Calc)= 9.47 |
Crystal System: |
Trigonal - RhombohedralH-M Symbol ( 3) Space Group: P 3 |
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Physical Properties of Dessauite
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Cleavage: |
None |
Color: |
Black. |
Density: |
4.68 |
Diaphaniety: |
Opaque |
Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). |
Habit: |
Tabular - Form dimensions are thin in one direction. |
Hardness: |
6.5-7 - Pyrite-Quartz |
Luster: |
Metallic |
Streak: |
black |
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Optical Properties of Dessauite
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Optical Data: |
NCalc= 4.25 - 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 |
RL Anisotrophism: |
Weak. |
RL Bireflectance: |
Low. |
RL Color: |
Ash gray with pale blue tones. |
RL Pleochroism: |
Very weak. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Dessauite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
17.30 |
17.70 |

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| 546 nm |
16.60 |
17.10 |

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| 589 nm |
16.10 |
16.60 |

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| 650 nm |
16.00 |
16.50 |

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Standardized Intensity (100%) Reflection Spectra of Dessauite in Oil
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
5.60 |
6.00 |

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| 546 nm |
5.00 |
5.50 |

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| 589 nm |
4.80 |
5.30 |

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| 650 nm |
4.60 |
5.10 |

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Calculated Relative Intensity Colors of Dessauite in Air
Relative Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
540% |
550% |
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| R2 |
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Calculated Relative Intensity Colors of Dessauite in Oil
Relative Intensity |
0% |
100% |
200% |
300% |
400% |
500% |
600% |
700% |
800% |
900% |
1000% |
| R1 |
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| R2 |
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Calculated Properties of Dessauite
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Electron Density: |
relectron=8.85 gm/cc note: rDessauite =9.47 gm/cc. |
Fermion Index |
Fermion Index = 0.06228 Boson Index = 0.93772 |
Photoelectric: |
PEDessauite = 158.61 barns/electron U=PEDessauite x relectron=1,404.30 barns/cc. |
Radioactivity: |
GRapi = 306,521.28 (Gamma Ray American Petroleum Institute Units)
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 / 5.86 cm |
6,884,805 |
1.86E-04 |
306,521.28 |
100.77 |
| 100 gm / 2.72 cm |
688,481 |
1.86E-05 |
30,652.13 |
10.08 |
| 10 gm / 1.26 cm |
68,848 |
1.86E-06 |
3,065.21 |
1.01 |
| 1 gm / 5.86 mm |
6,885 |
1.86E-07 |
306.52 |
0.10 |
| 0.1 gm / 2.72 mm |
688 |
1.86E-08 |
30.65 |
0.01 |
| 0.01 gm / 1.26 mm |
69 |
1.86E-09 |
3.07 |
0.00 |
| 0.001 gm / 0.59 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 9.47 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
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Dessauite Classification
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Dana Class: |
8.5.1.9 (8)Multiple Oxides with Nb, Ta, and Ti |
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(8.5)Dana Type |
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(8.5.1)Crichtonite group (ABC18 T2 O38) |
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8.5.1.1 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3 |
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8.5.1.2 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3 |
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8.5.1.3 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3 |
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8.5.1.4 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3 |
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8.5.1.5 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3 |
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8.5.1.6 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3 |
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8.5.1.7 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3 |
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8.5.1.8 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3 |
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8.5.1.9 Dessauite ! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3 |
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8.5.1.10 Cleusonite! Pb(U,U)(Ti,Fe2,Fe3)20(O,OH)38 R 3 3 |
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8.5.1.11 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3 |
Strunz Class: |
IV/C.09-45 IV - Oxides |
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IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds) |
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IV/C.09 - Crichtonite group |
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IV/C.09-10 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3 |
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IV/C.09-20 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3 |
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IV/C.09-30 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3 |
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IV/C.09-40 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3 |
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IV/C.09-45 Dessauite (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3 |
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IV/C.09-50 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3 |
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IV/C.09-60 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3 |
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IV/C.09-62 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3 |
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IV/C.09-70 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3 |
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IV/C.09-80 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3 |
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Other Dessauite Information
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References: |
NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.82,p807-811,1997) OPTIC PROP.(MinRec, v 29, p 235) |
See Also: |
Links to other databases for Dessauite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 -Google Images
4 -Google Scholar
5 -Handbook of Mineralogy (UofA)
6 -MinDAT
7 -MinMax(Deutsch)
8 -MinMax(English)
9 -Mineralienatlas (Deutsch)
10 -QUT Mineral Atlas
11 - Uranium Minerals
12 - WWW-MINCRYST
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Print or Cut-and-Paste your Dessauite Specimen Label here :
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Dessauite
(Sr,Pb)(Y,U)(Ti,Fe+++)20O38
Dana No: 8.5.1.9 Strunz No: IV/C.09-45
Locality:
Notes:
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