Gramaccioliite-(Y) Mineral Data

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General Gramaccioliite-(Y) Information

Chemical Formula:

(Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38

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

Empirical Formula:

Pb_0.61Sr_0.27Ba_0.02U_0.02Y_0.49Mn²⁺_0.37Ce_0.08Ca_0.04Nd_0.02La_0.02Ti_13.53Fe²⁺_5.49Zn_0.22 V⁵⁺_0.04Nb_0.04O₃₈

Environment:

Hydrothermal quartz veins in a biotitic gneiss. (crichtonite group; structure)

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Sambuco, Stura Valley, Piedmont, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Prof. Carlo M. Gramaccioli (1935-) of the University of Milano, Italy.

Synonym:

Davidite-(Y)

IMA2001-034

Gramaccioliite-(Y) Image

Images:

Gramaccioliite-(Y)

Comments: Black, metallic rystals of gramaccioliite-(Y) in matrix.
Location: Sambuco, Pianche di Vinazio, Piemont, Italy. Scale: Picture size 1.3 mm..
© Thomas Witzke

Gramaccioliite-(Y) Crystallography

Axial Ratios:

a:c = 1:2.01421

Cell Dimensions:

a = 10.411, c = 20.97, Z = 3; V = 1,968.40 Den(Calc)= 4.61

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

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)

Cleavage:

None

Color:

Black.

Diaphaneity:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Tabular - Form dimensions are thin in one direction.

Luster:

Metallic

Streak:

black

Optical Properties of Gramaccioliite-(Y)

Optical Data:

NCalc= 2.38 - from Gladstone-Dale relationship (KC = 0.2989) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Weak.

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)

Electron Density:

Bulk Density (Electron Density)=4.32 gm/cc
note: Specific Gravity of Gramaccioliite-(Y) =4.61 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_{Gramaccioliite-(Y)}= 142.11 barns/electron
U=PE_{Gramaccioliite-(Y)} x r_electron= 613.22 barns/cc.

Radioactivity:

GRapi = 21,765.77 (Gamma Ray American Petroleum Institute Units)
Concentration of Gramaccioliite-(Y) per GRapi unit = 45.94 (PPM)

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	488,317	1.32E-05	21,765.77	7.16
100 gm / 3.46 cm	48,832	1.32E-06	2,176.58	0.72
10 gm / 1.61 cm	4,883	1.32E-07	217.66	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

Dana Class:

08.05.01.11 (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

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 Gramaccioliite-(Y) Information

References:

NAME( AmMin 89:1827) PHYS. PROP.(AmMin 89:1827) OPTIC PROP.(AmMin 89:1827)

See Also:

Links to other databases for Gramaccioliite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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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: 08.05.01.11 Strunz No: 04.CC.40
Locality:

Notes: