Piergorite-(Ce) Mineral Data
General Piergorite-(Ce) Information
Chemical Formula:
Ca8Ce2(Al0.5 Fe+++0.5)([ ],Li,Be)2Si6B8O36(OH,F)2
Composition:
Molecular Weight = 1,498.89 gm
Lithium 0.23 % Li 0.49 % Li2 O
Calcium 22.41 % Ca 31.35 % CaO
Lanthanum 2.87 % La 3.37 % La2 O3
Cerium 5.42 % Ce 6.35 % Ce2 O3
Praeseodymium 0.56 % Pr 0.66 % Pr2 O3
Samarium 0.10 % Sm 0.12 % Sm2 O3
Gadolinium 0.10 % Gd 0.12 % Gd2 O3
Yttrium 0.36 % Y 0.45 % Y2 O3
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 % Al2 O3
Iron 1.49 % Fe 2.13 % Fe2 O3
Silicon 11.28 % Si 24.13 % SiO2
Boron 5.77 % B 18.58 % B2 O3
Hydrogen 0.07 % H 0.60 % H2 O
Neodymium 1.35 % Nd 1.57 % Nd2 O3
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
Empirical Formula:
Ca8.38 Mg0.02 La0.31 Ce0.58 Y0.06 Pr0.06 Nd0.14 Sm0.01 Th0.33 U0.04 Zr0.02 Gd0.01 Li0.49 Fe3+ 0.4
Mn2+ 0.07 Ti0.13 Al0.44 Be0.36 Si6.02 O36
Environment:
Found in myarolitic cavities inside a volcanic ejectum of syenitic composition from the Vico complex. Hellandite group.
IMA Status:
Approved IMA 2005 (Dana # Added)
Locality:
Vetralla, Viterbo Province, Latium, Italy Link to MinDat.org Location Data.
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.
Synonym:
IMA2005-008
Piergorite-(Ce) Image
Images:
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
Axial Ratios:
a:b:c =5.8817:1:2.1427
Cell Dimensions:
a = 28.097, b = 4.777, c = 10.236, Z = 2; beta = 96.81° V = 1,364.18 Den(Calc)= 3.65
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a
X Ray Diffraction:
By Intensity(I/Io ): 2.65(1)(213,4 13 ), 1.91(0.483)(223,4 23,821)2.9(0.449)(6 03,6 12 ), 2.78(0.43), 3.33(0.4), 3.01(0.34), 3.2(0.31), 1.74(0.28),
Physical Properties of Piergorite-(Ce)
Cleavage:
{010} Perfect
Color:
Colorelss, Pale yellow.
Diaphaneity:
Transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Platy - Sheet forms (e.g. micas).
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Piergorite-(Ce)
Gladstone-Dale:
CI calc = 0.027 (Excellent) - where the CI = (1-KPDcalc /KC ) KPDcalc = 0.1991,KC = 0.2046 Ncalc = 1.75
Optical Data:
Biaxial (-), a=1.717, b=1.728, g=1.735, bire=0.0180
Calculated Properties of Piergorite-(Ce)
Electron Density:
Bulk Density (Electron Density)=3.51 gm/cc note: Specific Gravity of Piergorite-(Ce) =3.65 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEPiergorite-(Ce) = 181.91 barns/electronU=PEPiergorite-(Ce) x r electron = 638.00 barns/cc.
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 Bequerols (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
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
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
References:
NAME( AmMin, v7, p1170) PHYS. PROP.(AmMin, v7, p1170) OPTIC PROP.(AmMin, v7, p1170)
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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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
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