Calciogadolinite Mineral Data

Calciogadolinite Mineral Data

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General Calciogadolinite Information

Chemical Formula:

CaREE(Fe+++)Be2Si2O10

Composition:

Molecular Weight = 474.11 gm

Calcium 8.45 % Ca 11.83 % CaO

La,Ce,Pr,Nd,Sm, 30.37 % RE 35.43 % REE₂O₃

Beryllium 3.80 % Be 10.55 % BeO

Iron 11.78 % Fe 16.84 % Fe₂O₃

Silicon 11.85 % Si 25.35 % SiO₂

Oxygen 33.75 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaREEFe³⁺Be₂Si₂O₁₀

Environment:

Generally regarded as calcian gadolinite.

IMA Status:

Not Approved IMA 1972

Locality:

Tadati (Tadachi) village, Nagano Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named after is composition and relationship to gadolinite.

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Calciogadolinite Crystallography

Axial Ratios:

a:b:c =1.3201:1:0.6206

Cell Dimensions:

a = 9.988, b = 7.566, c = 4.696, Z = 2; beta = 90° V = 354.87 Den(Calc)= 4.44

Crystal System:

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

Optical Properties of Calciogadolinite

Optical Data:

NCalc= 1.9 - from Gladstone-Dale relationship (KC = 0.2021) where Ncalc=Dcalc*KC+1

Calculated Properties of Calciogadolinite

Electron Density:

r_electron=4.18 gm/cc
note: r_{Calciogadolinite}=4.44 gm/cc.

Fermion Index

Fermion Index = 0.10283
Boson Index = 0.89717

Photoelectric:

PE_{Calciogadolinite}= 188.16 barns/electron
U=PE_{Calciogadolinite} x r_electron= 785.87 barns/cc.

Radioactivity:

GRapi = 30,585.51 (Gamma Ray American Petroleum Institute Units)

Calciogadolinite 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) 994.48 ±248.62 grams of pure Calciogadolinite .

**Estimated Radioactivity from Calciogadolinite** - 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 / 7.55 cm	682,784	1.85E-05	30,585.51	10.06
100 gm / 3.50 cm	68,278	1.85E-06	3,058.55	1.01
10 gm / 1.63 cm	6,828	1.85E-07	305.86	0.10
1 gm / 7.55 mm	683	1.85E-08	30.59	0.01
0.1 gm / 3.50 mm	68	1.85E-09	3.06	0.00
0.01 gm / 1.63 mm	7	1.85E-10	0.31	0.00
0.001 gm / 0.75 mm	1	1.85E-11	0.03	0.00

Weight of pure Calciogadolinite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.44 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 ( 1.52 % Th) From Sum REE Elements (30.37 % REE)

Calciogadolinite Classification

Dana Class:

54.2.1b.4 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.2)with B in [4] coordination

(54.2.1b)Datolite group (Homilite series)

54.2.1b.1 Bakerite Ca4B4(BO4)(SiO4)3(OH)3·(H2O) P 2₁/c 2/m

54.2.1b.2 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 2₁/c 2/m

54.2.1b.3 Gadolinite-(Y) Y2FeBe2Si2O10 P 2₁/a 2/m

54.2.1b.4 Calciogadolinite * CaREE(Fe)Be2Si2O10 P 2₁/a 2/m

54.2.1b.5 Homilite Ca2(Fe,Mg)B2Si2O10 P 2₁/a 2/m

54.2.1b.6 Minasgeraisite-(Y) CaY2Be2Si2O10 P 2₁/a 2/m

Strunz Class:

VIII/AX.00-00 VIII - Silicates

VIII/AX - Unclassified Strunz Nesosilicates

VIII/AX.00 - Datolite group (Homilite serie

Other Calciogadolinite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Calciogadolinite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Calciogadolinite Specimen Label here :

Calciogadolinite

CaREE(Fe+++)Be2Si2O10
Dana No: 54.2.1b.4 Strunz No: VIII/AX.00-00
Locality:

Notes: