Perrierite-(Ce) Mineral Data

General Perrierite-(Ce) Information

Chemical Formula:

(Ce,La,Ca)4(Fe++,Mg)2(Ti,Fe+++)3Si4O22

Composition:

Molecular Weight = 1,201.74 gm

Sodium 0.38 % Na 0.52 % Na₂O

Strontium 0.73 % Sr 0.86 % SrO

Calcium 3.00 % Ca 4.20 % CaO

Lanthanum 17.34 % La 20.33 % La₂O₃

Cerium 15.16 % Ce 17.75 % Ce₂O₃

La,Ce,Pr,Nd,Sm, 4.79 % RE 5.59 % REE₂O₃

Thorium 0.97 % Th 1.10 % ThO₂

Magnesium 0.20 % Mg 0.34 % MgO

Titanium 11.16 % Ti 18.61 % TiO₂

Manganese 1.37 % Mn 1.77 % MnO

Aluminum 0.22 % Al 0.42 % Al₂O₃

Iron 6.04 % Fe 7.77 % FeO

Silicon 9.35 % Si 20.00 % SiO₂

Oxygen 29.29 % O

______ ______

100.00 % 99.27 % = TOTAL OXIDE

Empirical Formula:

La_1.5Ce_1.3Ca_0.5REE_0.4Na_0.2Sr_0.1Th_0.05Ti_2.8Fe²⁺_1.3Ca_0.4Mn²⁺_0.3Mg_0.1Al_0.1Si₄O₂₂

Environment:

In sands derived from weathered tuffs and syenite pegmatites.

IMA Status:

Approved IMA 1987

Locality:

Nettuno, Lazio, and on Mt. Amiata, Tuscany, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Carlo Perier (1886-1948), Italian mineralogist.

Name Pronunciation:

Perrierite-(Ce) + Pronunciation

Synonym:

ICSD 33145

PDF 19-302

Perrierite-(Ce) Image

Images:

Click Here for Larger Perrierite-(Ce) Image

Perrierite-(Ce) Pyrochlore Zircon Loparite-(Ce)

Comments: Reddish black perrierite crystal, with orange-brown pyrochlore crystal, yellow-brown zircon, and grayish-black loparite.
Location: Buer, Bjorkedalen, Langesundfjord, Telemark, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Perrierite-(Ce)

Comments: Black, granular perrierite in white calcite.
Location: Buer, BjÃ¸rkedalen, Porsgrunn, Telemark, Norway. Scale: Picture size 3 mm.
© Paul M. Schumacher

Perrierite-(Ce) Crystallography

Axial Ratios:

a:b:c =2.4217:1:2.0871

Cell Dimensions:

a = 13.61, b = 5.62, c = 11.73, Z = 2; beta = 113.5° V = 822.79 Den(Calc)= 4.85

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 21/a

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

By Intensity(I/I_o): 2.96(1), 2.82(0.65), 5.34(0.65),

Crystal Structure:

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Gottardi G , American Mineralogist , 45 (1960) p.1-14, The crystal structure of perrierite

Physical Properties of Perrierite-(Ce)

Color:

Black, Brownish, Dark reddish brown.

Density:

4.29 - 4.45, Average = 4.37

Diaphaneity:

Opaque to translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5.5 - Knife Blade

Luster:

Resinous

Streak:

brown

Optical Properties of Perrierite-(Ce)

Gladstone-Dale:

CI meas= -0.079 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2045,KPDmeas= 0.2269,KC= 0.2102
Ncalc = 1.9 - 2.02

Optical Data:

Biaxial (-), a=1.9-1.95, b=2.01, g=2.02-2.06, bire=0.1100-0.1200, 2V(Calc)=32-82, 2V(Meas)=60.

Pleochroism (x):

yellow.

Pleochroism (y):

opaque or dark red-violet.

Pleochroism (z):

opaque or dark brown.

Calculated Properties of Perrierite-(Ce)

Electron Density:

Bulk Density (Electron Density)=4.45 gm/cc
note: Specific Gravity of Perrierite-(Ce) =4.85 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Perrierite-(Ce)}= 215.14 barns/electron
U=PE_{Perrierite-(Ce)} x r_electron= 957.15 barns/cc.

Radioactivity:

GRapi = 18,909.96 (Gamma Ray American Petroleum Institute Units)
Concentration of Perrierite-(Ce) per GRapi unit = 52.88 (PPM)

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

**Estimated Radioactivity from Perrierite-(Ce)** - weak
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 / 7.33 cm	432,895	1.17E-05	18,909.96	6.22
100 gm / 3.40 cm	43,290	1.17E-06	1,891.00	0.62
10 gm / 1.58 cm	4,329	1.17E-07	189.10	0.06
1 gm / 7.33 mm	433	1.17E-08	18.91	0.01
0.1 gm / 3.40 mm	43	1.17E-09	1.89	0.00
0.01 gm / 1.58 mm	4	1.17E-10	0.19	0.00
0.001 gm / 0.73 mm	0	1.17E-11	0.02	0.00

Weight of pure Perrierite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.85 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

Perrierite-(Ce) Classification

Dana Class:

56.02.08.03 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.02)with cations in [4] and/or >[4] coordination

(56.02.08)Perierite - Chevkinite group

56.02.08.01 Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m

56.02.08.02 Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m

56.02.08.03 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m

56.02.08.04 Orthochevkinite* (Ce,La,Ca,Na,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 Unk Ortho

56.02.08.05 Rengeite! Sr4ZrTi4Si4O22 P 2₁/a 2/m

56.02.08.06 Matsubaraite! Sr4TiTi4Si4O22 P 2₁/a 2/m

56.02.08.07 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m

56.02.08.08 Maoniupingite-(Ce)! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m

56.02.08.09 Dingdaohengite-(Ce)! (Ce,La)4Fe(Ti,Fe,Mg,Fe)2Ti2Si4O22 P 2₁/a (pseudo-C 2/m) 2/m

Strunz Class:

09.BE.70 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.70 Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m

09.BE.70 Karnasurtite-(Ce) (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4•3(H2O)(?) Unk. Hex

09.BE.70 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m

09.BE.70 Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m

09.BE.70 Rengeite! Sr4ZrTi4Si4O22 P 2₁/a 2/m

09.BE.70 Maoniupingite-(Ce)! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m

09.BE.70 Matsubaraite! Sr4TiTi4Si4O22 P 2₁/a 2/m

09.BE.70 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m

09.BE.70 Dingdaohengite-(Ce)! (Ce,La)4Fe(Ti,Fe,Mg,Fe)2Ti2Si4O22 P 2₁/a (pseudo-C 2/m) 2/m

Other Perrierite-(Ce) Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

See Also:

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

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Perrierite-(Ce)

(Ce,La,Ca)4(Fe++,Mg)2(Ti,Fe+++)3Si4O22
Dana No: 56.02.08.03 Strunz No: 09.BE.70
Locality:

Notes: