Piergorite-(Ce) Mineral Data

Piergorite-(Ce) Mineral Data
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General Piergorite-(Ce) Information

Help on Chemical Formula: Chemical Formula: Ca8Ce2(Al0.5 Fe+++0.5)([ ],Li,Be)2Si6B8O36(OH,F)2
Help on Composition: Composition: Molecular Weight = 1,498.89 gm
   Lithium         0.23 %  Li    0.49 % Li2O
   Calcium        22.41 %  Ca   31.35 % CaO
   Lanthanum       2.87 %  La    3.37 % La2O3
   Cerium          5.42 %  Ce    6.35 % Ce2O3
   Praeseodymium   0.56 %  Pr    0.66 % Pr2O3
   Samarium        0.10 %  Sm    0.12 % Sm2O3
   Gadolinium      0.10 %  Gd    0.12 % Gd2O3
   Yttrium         0.36 %  Y     0.45 % Y2O3
   Thorium         5.11 %  Th    5.81 % ThO2
   Magnesium       0.03 %  Mg    0.05 % MgO
   Zirconium       0.12 %  Zr    0.16 % ZrO2
   Uranium         0.64 %  U     0.72 % UO2
   Titanium        0.42 %  Ti    0.69 % TiO2
   Manganese       0.26 %  Mn    0.33 % MnO
   Beryllium       0.22 %  Be    0.60 % BeO
   Aluminum        0.79 %  Al    1.50 % Al2O3
   Iron            1.49 %  Fe    2.13 % Fe2O3
   Silicon        11.28 %  Si   24.13 % SiO2
   Boron           5.77 %  B    18.58 % B2O3
   Hydrogen        0.07 %  H     0.60 % H2O
   Neodymium       1.35 %  Nd    1.57 % Nd2O3
   Chlorine        0.24 %  Cl    0.24 % Cl
                    -   %   Cl   -0.05 % -O=Cl2   
   Oxygen         38.96 %  O
   Fluorine        1.22 %  F     1.22 % F
                    -   %   F    -0.51 % -O=F2    
                 ______        ______ 
                 100.00 %      100.68 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca8.38Mg0.02La0.31Ce0.58Y0.06Pr0.06Nd0.14Sm0.01Th0.33U0.04Zr0.02Gd0.01Li0.49Fe3+0.4 Mn2+0.07Ti0.13Al0.44Be0.36Si6.02O36
Help on Environment: Environment: Found in myarolitic cavities inside a volcanic ejectum of syenitic composition from the Vico complex. Hellandite group.
Help on IMA Status: IMA Status: Approved IMA 2005 (Dana # Added)
Help on Locality: Locality: Vetralla, Viterbo Province, Latium, Italy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as an acronym from the names of two Italian collectors that have provided us with the sample in study: Giancarlo PIERini and Pietro GORini.
Help on Synonym: Synonym: IMA2005-008
 

Piergorite-(Ce) Image

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Piergorite-(Ce)

Comments: B&W image of a group of platy-elongated crystals of piergorite-(Ce) on matrix.
Location: Tre Croci locality, Vetralla, Viterbo province, Italy. Scale: Crystal Length 400 µm.
© American Mineralogist

Piergorite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =5.8817:1:2.1427
Help on Cell Dimensions: Cell Dimensions: a = 28.097, b = 4.777, c = 10.236, Z = 2; beta = 96.81° V = 1,364.18 Den(Calc)= 3.65
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.65(1)(213,413 ), 1.91(0.483)(223,423,821)2.9(0.449)(603,612 ),2.78(0.43), 3.33(0.4), 3.01(0.34), 3.2(0.31), 1.74(0.28),
Click Here for Large Piergorite-(Ce) Structure Window Crystal Structure:

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Boiocchi M , Callegari A , Ottolini L , American Mineralogist , 91 (2006) p.1170-1177, The crystal structure of piergorite-(Ce),, Ca8Ce2(Al0.5Fe3+0.5)Sum1(X,Li,Be)2Si6B8O36(OH,F)2:, A new borosilicate from Vetralla, Italy,, with a modified hellandite-type chain, Locality: Vetralla, Italy

 

Physical Properties of Piergorite-(Ce)

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Colorelss, Pale yellow.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Piergorite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1991,KC= 0.2046
Ncalc = 1.75
Help on Optical Data: Optical Data: Biaxial (-), a=1.717, b=1.728, g=1.735, bire=0.0180
 

Calculated Properties of Piergorite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.51 gm/cc
note: Specific Gravity of Piergorite-(Ce) =3.65 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEPiergorite-(Ce) = 181.91 barns/electron
U=PEPiergorite-(Ce) x relectron= 638.00 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 156,752.30 (Gamma Ray American Petroleum Institute Units)
Concentration of Piergorite-(Ce) per GRapi unit = 6.38 (PPM)

Piergorite-(Ce) 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) 194.04 ± 48.51 grams of pure Piergorite-(Ce) .

Estimated Radioactivity from Piergorite-(Ce) - strong
Specimen
Size
Weight/Volume
(Sphere) *		 Calculated
Activity
Becquerels
(Bq)		 Calculated
Activity
Curies (Ci)		 Estimated
Activity
GR(api)		 Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 8.06 cm 3,425,811 9.26E-05 156,752.30 51.54
100 gm / 3.74 cm 342,581 9.26E-06 15,675.23 5.15
10 gm / 1.74 cm 34,258 9.26E-07 1,567.52 0.52
1 gm / 8.06 mm 3,426 9.26E-08 156.75 0.05
0.1 gm / 3.74 mm 343 9.26E-09 15.68 0.01
0.01 gm / 1.74 mm 34 9.26E-10 1.57 0.00
0.001 gm / 0.81 mm 3 9.26E-11 0.16 0.00

Weight of pure Piergorite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.65 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
 

Piergorite-(Ce) Classification
Help on Dana Class: Dana Class: 54.02.02.07 (54)Nesosilicate Borosilicates and Some Beryllosilicates
  (54.02)with B in [4] coordination
  (54.02.02)Hellandite group
 
54.02.02.01 Hellandite-(Y) (Ca,REE)4(Y,Ce)2(Al,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.02 Tadzhikite-(Y)! Ca4(Y,Ce)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.03 Tadzhikite-(Ce) Ca4(Ce,Y)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.04 Hellandite-(Ce)! (Ca3REE)4Ce2Al[]2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.05 Mottanaite-(Ce)! Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2 P 2/a 2/m
 
54.02.02.06 Ciprianiite! Ca4[(Th,U)(REE)]2(Al,[])2[Si4B4O22](OH,F)2 P 2/a 2/m
 
54.02.02.07 Piergorite-(Ce)! Ca8Ce2(Al0.5Fe0.5)([],Li,Be)2Si6B8O36(OH,F)2 P 2/a 2/m
Help on Strunz Class: Strunz Class: 09.DL.10 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DL -Inosilicates with 5-periodic double chains, Si10O28
 
09.DL.10 Piergorite-(Ce)! Ca8Ce2(Al0.5Fe0.5)([],Li,Be)2Si6B8O36(OH,F)2 P 2/a 2/m
 

Other Piergorite-(Ce) Information
Help on References: References: NAME( AmMin, v7, p1170) PHYS. PROP.(AmMin, v7, p1170) OPTIC PROP.(AmMin, v7, p1170)
Help on See Also: See Also: Links to other databases for Piergorite-(Ce) :
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 Piergorite-(Ce) Specimen Label here :

Piergorite-(Ce)

Ca8Ce2(Al0.5 Fe+++0.5)([ ],Li,Be)2Si6B8O36(OH,F)2
Dana No: 54.02.02.07 Strunz No: 09.DL.10
Locality:

 

Notes: