Ashcroftine-(Ce) Mineral Data

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General Ashcroftine-(Ce) Information

Chemical Formula:

K5Na5(Ce,Ca)12Si28O70(OH)2(CO3)8•8(H2O)

Composition:

Molecular Weight = 4,256.27 gm

Potassium 4.59 % K 5.53 % K₂O

Sodium 2.70 % Na 3.64 % Na₂O

Calcium 2.82 % Ca 3.95 % CaO

Cerium 29.63 % Ce 34.70 % Ce₂O₃

Silicon 18.48 % Si 39.53 % SiO₂

Hydrogen 0.43 % H 3.81 % H₂O

Carbon 2.26 % C 8.27 % CO₂

Oxygen 39.09 % O

______ ______

100.00 % 99.44 % = TOTAL OXIDE

Empirical Formula:

K₅Na₅Ce₉Ca₃Si₂₈O₇₀(OH)₂(CO₃)₈•8(H₂O)

IMA Status:

Not Approved IMA

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named for Frederick Noel Ashcroft (1878-1949), benefactor to the British Museum (Natural History), London, England.

Name Pronunciation:

Ashcroftine-(Ce) + Pronunciation

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Ashcroftine-(Ce) Crystallography

Axial Ratios:

a:c = 1:0.72984

Cell Dimensions:

a = 23.994, c = 17.512, Z = 4; V = 10,081.87 Den(Calc)= 2.80

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm

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

By Intensity(I/I_o): 17.1(1), 12(0.8), 3.1(0.6),

Physical Properties of Ashcroftine-(Ce)

Color:

Pink.

Density:

2.53 - 2.61, Average = 2.57

Diaphaneity:

Transparent to Translucent

Luster:

Vitreous - Silky

Optical Properties of Ashcroftine-(Ce)

Gladstone-Dale:

CI meas= -0.115 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.193,KPDmeas= 0.2103,KC= 0.1887
Ncalc = 1.48 - 1.53

Optical Data:

Uniaxial (+), w=1.536, e=1.545, bire=0.0090.

Calculated Properties of Ashcroftine-(Ce)

Electron Density:

Bulk Density (Electron Density)=2.66 gm/cc
note: Specific Gravity of Ashcroftine-(Ce) =2.80 gm/cc.

Fermion Index:

Fermion Index = 0.0091086179
Boson Index = 0.9908913821

Photoelectric:

PE_{Ashcroftine-(Ce)}= 145.64 barns/electron
U=PE_{Ashcroftine-(Ce)} x r_electron= 387.45 barns/cc.

Radioactivity:

GRapi = 30,089.72 (Gamma Ray American Petroleum Institute Units)
Concentration of Ashcroftine-(Ce) per GRapi unit = 33.23 (PPM)

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

**Estimated Radioactivity from Ashcroftine-(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 / 8.80 cm	665,052	1.80E-05	30,089.72	9.89
100 gm / 4.09 cm	66,505	1.80E-06	3,008.97	0.99
10 gm / 1.90 cm	6,651	1.80E-07	300.90	0.10
1 gm / 8.80 mm	665	1.80E-08	30.09	0.01
0.1 gm / 4.09 mm	67	1.80E-09	3.01	0.00
0.01 gm / 1.90 mm	7	1.80E-10	0.30	0.00
0.001 gm / 0.88 mm	1	1.80E-11	0.03	0.00

Weight of pure Ashcroftine-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.80 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 ( 1.48 % Th) From Sum REE Elements (29.63 % REE)

Ashcroftine-(Ce) Classification

Dana Class:

65.00.00.00 (65)Inosilicate Minerals

(65.00)Without Dana Classification Numbers

(65.00.00)Inosilicate

65.00.00.00 Ashcroftine-(Ce)* K5Na5(Ce,Ca)12Si28O70(OH)2(CO3)8•8(H2O) I 4/mmm 4/m 2/m 2/m

65.00.00.00 Brokenhillite* (Mn,Fe)32[Si24O60]OH29Cl11 P 6₃mc 6mm

65.00.00.00 Grossmanite CaTiAlSiO6 C 2/m 2/m

65.00.00.00 Hypersthene? (Mg,Fe)2Si2O6 2/m 2/m 2/m

65.00.00.00 IMA2007-015 K(CaNa)(Fe3Al2)(Si6Al2)O22(OH)2 C 2/m 2/m

65.00.00.00 IMA2008-070 NaLi2(Fe2Al2Li)(Si6Al2)O22F2 C 2/m 2/m

65.00.00.00 IMA2009-010 [Ba6(PO4)2(CO3)][Fe7(OH)4Fe2O2(SiO3)8] P1 1

65.00.00.00 IMA2009-012 NaNa2(Mg2Al2Li)Si8O22F2 C 2/m 2/m

65.00.00.00 Kushiroite CaAl2SiO6 C 2/c 2/m

65.00.00.00 Plumalsite* Pb4Al2(SiO3)7(?) Unk Ortho

Strunz Class:

09.DN.15 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DN -Inosilicates with 6-periodic double chains

09.DN.15 Ashcroftine-(Ce)* K5Na5(Ce,Ca)12Si28O70(OH)2(CO3)8•8(H2O) I 4/mmm 4/m 2/m 2/m

09.DN.15 Ashcroftine-(Y) K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8•8(H2O) I 4/mmm 4/m 2/m 2/m

Other Ashcroftine-(Ce) Information

See Also:

Links to other databases for Ashcroftine-(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 Ashcroftine-(Ce) Specimen Label here :

Ashcroftine-(Ce)

K5Na5(Ce,Ca)12Si28O70(OH)2(CO3)8•8(H2O)
Dana No: 65.00.00.00 Strunz No: 09.DN.15
Locality:

Notes: