Gramaccioliite-(Y) Mineral Data

General Gramaccioliite-(Y) Information
Help on Chemical Formula: Chemical Formula: (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38
Help on Composition: Composition: Molecular Weight = 1,822.46 gm
   Barium      0.15 %  Ba    0.17 % BaO
   Strontium   1.30 %  Sr    1.54 % SrO
   Calcium     0.09 %  Ca    0.12 % CaO
   Lanthanum   0.15 %  La    0.18 % La2O3
   Cerium      0.62 %  Ce    0.72 % Ce2O3
   Yttrium     2.39 %  Y     3.04 % Y2O3
   Uranium     0.26 %  U     0.29 % U2O3
   Titanium   35.55 %  Ti   59.30 % TiO2
   Manganese   1.12 %  Mn    1.44 % MnO
   Niobium     0.20 %  Nb    0.29 % Nb2O5
   Vanadium    0.11 %  V     0.20 % V2O5
   Zinc        0.79 %  Zn    0.98 % ZnO
   Iron       16.82 %  Fe   21.64 % FeO
   Lead        6.94 %  Pb    7.47 % PbO
   Neodymium   0.16 %  Nd    0.18 % Nd2O3
   Oxygen     33.36 %  O
             ______        ______ 
             100.00 %       97.56 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb0.61Sr0.27Ba0.02U0.02Y0.49Mn2+0.37Ce0.08Ca0.04Nd0.02La0.02Ti13.53Fe2+5.49Zn0.22 V5+0.04Nb0.04O38
Help on Environment: Environment: Hydrothermal quartz veins in a biotitic gneiss. (crichtonite group; structure)
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Sambuco, Stura Valley, Piedmont, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Prof. Carlo M. Gramaccioli (1935-) of the University of Milano, Italy.
Help on Synonym: Synonym: Davidite-(Y)
  IMA2001-034
 

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Gramaccioliite-(Y) Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:2.01421
Help on Cell Dimensions: Cell Dimensions: a = 10.411, c = 20.97, Z = 3; V = 1,968.40 Den(Calc)= 4.61
Help on Crystal System: Crystal System: Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.002(1)(300), 1.606(0.95)(3.1.10), 2.258(0.7)(134),2.892(0.7)(116), 1.809(0.6)(318), 2.147(0.5), 2.852(0.5),
Click Here for Large Gramaccioliite-(Y) Structure Window Crystal Structure:

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Orlandi P , Pasero M , Rotiroti N , Olmi F , Demartin F , Moelo Y , European Journal of Mineralogy , 16 (2004) p.171-175, Gramaccioliite-(Y), a new mineral of the crichtonite group from Stura Valley, Piedmont, Italy, Locality: the gneiss of the Hercynian Massif of Argentera at Sambuco, Italy

 

Physical Properties of Gramaccioliite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Hexagonal - Six-sided crystal shape in cross-section or habit.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Luster: Luster: Metallic
Help on Streak: Streak: black
 

Optical Properties of Gramaccioliite-(Y)

Help on Optical Data: Optical Data: NCalc= 2.38 - from Gladstone-Dale relationship (KC = 0.2989) where Ncalc=Dcalc*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Gramaccioliite-(Y) in Air
λ R  ∑ R(λ) 
 470 nm   19.20   
 546 nm   17.90 
 589 nm   17.60 
 650 nm   17.40 
Standardized Intensity (100%) Reflection Spectra of Gramaccioliite-(Y) in Oil
λ R  ∑ R(λ) 
 470 nm    6.70   
 546 nm    5.90 
 589 nm    5.70 
 650 nm    5.80 
Calculated Relative Intensity Colors of Gramaccioliite-(Y) in Air
Relative
Intensity		    0%   50% 100% 150% 200% 250% 300% 350% 400% 450% 500%
R                      
Calculated Relative Intensity Colors of Gramaccioliite-(Y) in Oil
Relative
Intensity		    0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000%
R                      
 

Calculated Properties of Gramaccioliite-(Y)

Help on Electron Density: Electron Density:

relectron=4.32 gm/cc
note: rGramaccioliite-(Y) =4.61 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.06686
Boson Index = 0.93314
Help on Photoelectric: Photoelectric:

PEGramaccioliite-(Y) = 142.11 barns/electron
U=PEGramaccioliite-(Y) x relectron= 613.22 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 21,765.13 (Gamma Ray American Petroleum Institute Units)

Gramaccioliite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Gramaccioliite-(Y) - weak
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 / 7.45 cm 488,303 1.32E-05 21,765.13 7.16
100 gm / 3.46 cm 48,830 1.32E-06 2,176.51 0.72
10 gm / 1.61 cm 4,883 1.32E-07 217.65 0.07
1 gm / 7.45 mm 488 1.32E-08 21.77 0.01
0.1 gm / 3.46 mm 49 1.32E-09 2.18 0.00
0.01 gm / 1.61 mm 5 1.32E-10 0.22 0.00
0.001 gm / 0.75 mm 0 1.32E-11 0.02 0.00

Weight of pure Gramaccioliite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.61 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
Estimated Thorium Activity ( 0.05 % Th) From Sum REE Elements ( 0.93 % REE)
 

Gramaccioliite-(Y) Classification
Help on Dana Class: Dana Class: 8.5.1.11 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.5)Dana Type
  (8.5.1)Crichtonite group (ABC18 T2 O38)
 
8.5.1.1 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
8.5.1.2 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
8.5.1.3 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
8.5.1.4 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3
 
8.5.1.5 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
8.5.1.6 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
8.5.1.7 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
8.5.1.8 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
8.5.1.9 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
8.5.1.10 Cleusonite! Pb(U,U)(Ti,Fe2,Fe3)20(O,OH)38 R 3 3
 
8.5.1.11 Gramaccioliite-(Y) ! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
Help on Strunz Class: Strunz Class: IV/C.09-62 IV - Oxides
  IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)
  IV/C.09 - Crichtonite group
 
IV/C.09-10 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
IV/C.09-20 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
IV/C.09-30 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
IV/C.09-40 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
IV/C.09-45 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
IV/C.09-50 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
IV/C.09-60 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
IV/C.09-62 Gramaccioliite-(Y) (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
 
IV/C.09-70 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
IV/C.09-80 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3
 

Other Gramaccioliite-(Y) Information
Help on References: References: NAME( AmMin 89:1827) PHYS. PROP.(AmMin 89:1827) OPTIC PROP.(AmMin 89:1827)
Help on See Also: See Also: Links to other databases for Gramaccioliite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Gramaccioliite-(Y) Specimen Label here :

Gramaccioliite-(Y)

(Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38
Dana No: 8.5.1.11 Strunz No: IV/C.09-62
Locality:

 

Notes:

 
 
   
 
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