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 % 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

Empirical Formula:

Ca_8.38Mg_0.02La_0.31Ce_0.58Y_0.06Pr_0.06Nd_0.14Sm_0.01Th_0.33U_0.04Zr_0.02Gd_0.01Li_0.49Fe³⁺_0.4 Mn²⁺_0.07Ti_0.13Al_0.44Be_0.36Si_6.02O₃₆

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 - PrismaticH-M Symbol (2/m) Space Group: P 2/a

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

By Intensity(I/I_o): 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),

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)

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:

PE_{Piergorite-(Ce)}= 181.91 barns/electron
U=PE_{Piergorite-(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 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

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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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: