Steenstrupine-(Ce) Mineral Data

Steenstrupine-(Ce) Mineral Data +

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General Steenstrupine-(Ce) Information

Chemical Formula:

Na14Ce6Mn++Mn+++Fe++2(Zr,Th)(Si6O18)2(PO4)7·3(H2O)

Composition:

Molecular Weight = 3,142.39 gm

Sodium 10.24 % Na 13.81 % Na₂O

Cerium 26.75 % Ce 31.34 % Ce₂O₃

Thorium 1.85 % Th 2.10 % ThO₂

Zirconium 2.18 % Zr 2.94 % ZrO₂

Manganese 3.50 % Mn 2.26 % MnO / 2.51 % Mn₂O₃

Iron 3.55 % Fe 4.57 % FeO

Silicon 10.73 % Si 22.94 % SiO₂

Phosphorus 6.90 % P 15.81 % P₂O₅

Hydrogen 0.19 % H 1.72 % H₂O

Oxygen 34.11 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₁₄Ce₆Mn²⁺Mn³⁺Fe²⁺₂Zr_0.75Th_0.25(Si₆O₁₈)₂(PO₄)₇·3(H₂O)

Environment:

Charateristic mineral associated with ultra-agpaitic pegmatites of nepheline syenites and sodalite syenites.

IMA Status:

Valid Species (Pre-IMA) 1881

Locality:

Kangerdluarsuc, Julianehaab district, Greenland. Link to MinDat.org Location Data.

Name Origin:

Name for Knud Hohannes Vogelius Steenstrup (1842-1913), geologist, Copenhagen, Denmark.

Steenstrupine-(Ce) Image

Images:

Steenstrupine-(Ce)

Comments: Dark gray, coarse grained, elongated crystals of steenstrupine-(Ce) in matrix.
Location: Kvanefield, Ilimanssaq, Greenland. Scale: Specimen Size 5.6 cm.
© Paul M. Schumacher

Steenstrupine-(Ce) Crystallography

Axial Ratios:

a:c = 1:4.34789

Cell Dimensions:

a = 10.46, c = 45.479, Z = 3; V = 4,309.28 Den(Calc)= 3.63

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.87(1), 3.09(1), 4.2(0.7),

Crystal Structure:

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Moore P B , Shen J , Tschermaks Mineralogische und Petrographische Mitteilungen , 31 (1983) p.47-67, Crystal structure of steenstrupine: A rod structure of unusual complexity

Physical Properties of Steenstrupine-(Ce)

Cleavage:

None

Color:

Brown red, Dark brown, Black.

Density:

3.4

Diaphaniety:

Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Blocky - Crystal shape tends to be equant (e.g. feldspars).

Habit:

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

Habit:

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

Hardness:

4 - Fluorite

Luster:

Sub Metallic

Streak:

tan

Optical Properties of Steenstrupine-(Ce)

Dichroism (e):

yellow brown.

Dichroism (w):

dark brown.

Gladstone-Dale:

CI meas= -0.087 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1829,KPDmeas= 0.1953,KC= 0.1797

Optical Data:

Uniaxial (-), e=1.66-1.663, w=1.665-1.668, bire=0.0050.

Calculated Properties of Steenstrupine-(Ce)

Electron Density:

r_electron=3.40 gm/cc
note: r_{Steenstrupine-(Ce)}=3.63 gm/cc.

Fermion Index

Fermion Index = 0.00836
Boson Index = 0.99164

Photoelectric:

PE_{Steenstrupine-(Ce)}= 179.31 barns/electron
U=PE_{Steenstrupine-(Ce)} x r_electron= 609.59 barns/cc.

Radioactivity:

GRapi = 36,882.85 (Gamma Ray American Petroleum Institute Units)

Steenstrupine-(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) 824.68 ±206.17 grams of pure Steenstrupine-(Ce) .

**Estimated Radioactivity from Steenstrupine-(Ce)** - 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 / 8.07 cm	827,017	2.24E-05	36,882.85	12.13
100 gm / 3.75 cm	82,702	2.24E-06	3,688.29	1.21
10 gm / 1.74 cm	8,270	2.24E-07	368.83	0.12
1 gm / 8.07 mm	827	2.24E-08	36.88	0.01
0.1 gm / 3.75 mm	83	2.24E-09	3.69	0.00
0.01 gm / 1.74 mm	8	2.24E-10	0.37	0.00
0.001 gm / 0.81 mm	1	2.24E-11	0.04	0.00

Weight of pure Steenstrupine-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.63 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

Steenstrupine-(Ce) Classification

Dana Class:

61.4.2.1 (61)Cyclosilicate Six-Membered Rings

(61.4)with other anions

(61.4.2)Steenstrupine group

61.4.2.1 Steenstrupine-(Ce) Na14Ce6MnMnFe2(Zr,Th)(Si6O18)2(PO4)7·3(H2O) R 3m 3 2/m

61.4.2.2 Thorosteenstrupine (Ca,Th,Mn)3Si4O11F·6(H2O) None

Strunz Class:

VIII/E.17-10 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.17 - Steenstrupine-(Ce) series

VIII/E.17-05 Abenakiite-(Ce) Na26REE6(SiO3)6(PO4)6(CO3)6(SO2)O R 3m 3 2/m

VIII/E.17-10 Steenstrupine-(Ce) Na14Ce6MnMnFe2(Zr,Th)(Si6O18)2(PO4)7·3(H2O) R 3m 3 2/m

Other Steenstrupine-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Steenstrupine-(Ce) :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas

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Print or Cut-and-Paste your Steenstrupine-(Ce) Specimen Label here :

Steenstrupine-(Ce)

Na14Ce6Mn++Mn+++Fe++2(Zr,Th)(Si6O18)2(PO4)7·3(H2O)
Dana No: 61.4.2.1 Strunz No: VIII/E.17-10
Locality:

Notes: