Proshchenkoite-(Y) Mineral Data

General Proshchenkoite-(Y) Information

Chemical Formula:

(Y,REE,Ca,Na,Mn)15Fe++Ca(P,Si)Si6B3(O,F)48

Composition:

Molecular Weight = 2,711.51 gm

Sodium 0.98 % Na 1.33 % Na₂O

Calcium 3.77 % Ca 5.27 % CaO

La,Ce,Pr,Nd,Sm, 40.04 % RE 46.72 % REE₂O₃

Yttrium 12.13 % Y 15.41 % Y₂O₃

Thorium 0.86 % Th 0.97 % ThO₂

Titanium 0.04 % Ti 0.06 % TiO₂

Manganese 1.86 % Mn 2.41 % MnO

Iron 1.71 % Fe 2.20 % FeO

Silicon 6.54 % Si 13.98 % SiO₂

Boron 1.28 % B 4.11 % B₂O₃

Arsenic 0.11 % As 0.17 % As₂O₅

Phosphorus 0.80 % P 1.83 % P₂O₅

Lead 0.08 % Pb 0.08 % PbO

Oxygen 20.39 % O

Fluorine 9.42 % F 9.42 % F

- % F -3.97 % -O=F₂

______ ______

100.00 % 99.99 % = TOTAL OXIDE

Empirical Formula:

Y_3.7REE_7.54Ca_1.55Na_1.16Mn²⁺_0.77Th_0.1Pb_0.01Fe²⁺_0.83Mn²⁺_0.15Ti_0.02CaP_0.7As_0.04Si_0.26 Si_6.05B_3.2O_34.55F_13.45

Environment:

Vicanite group

IMA Status:

Approved IMA 2008 (Dana # Added)

Locality:

Tommot REE-Nb deposit, Yakutia, Russia. Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals, Nomenclature and Classification (CNMNC)

Synonym:

IMA2008-007

Proshchenkoite-(Y) Image

Images:

Proshchenkoite-(Y)

Comments: Brown grains of proshchenkoite-(Y) on filter paper used for XRD analysis.
Location: Tommot, Yakutia, Russia. Scale: Grain Size 0.3 mm.
© Thomas Witzke

Proshchenkoite-(Y) Crystallography

Axial Ratios:

a:c = 1:2.54821

Cell Dimensions:

a = 10.7527, c = 27.4002, Z = 3; V = 2,743.59 Den(Calc)= 4.92

Crystal System:

Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 2.968(1), 3.144(0.77), 3.028(0.45),4.441(0.36), 1.713(0.32), 1.782(0.32), 1.806(0.3), 2.672(0.3),

Physical Properties of Proshchenkoite-(Y)

Color:

Brown.

Density:

4.72

Diaphaneity:

Transparent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

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

Habit:

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

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Proshchenkoite-(Y)

Gladstone-Dale:

CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1486,KPDmeas= 0.1549,KC= 0.1575
Ncalc = 1.74 - 1.77

Optical Data:

Uniaxial (-), e=1.728, w=1.734, bire=0.0060.

Calculated Properties of Proshchenkoite-(Y)

Electron Density:

Bulk Density (Electron Density)=4.30 gm/cc
note: Specific Gravity of Proshchenkoite-(Y) =4.72 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_{Proshchenkoite-(Y)}= 287.38 barns/electron
U=PE_{Proshchenkoite-(Y)} x r_electron=1,237.08 barns/cc.

Radioactivity:

GRapi = 16,789.40 (Gamma Ray American Petroleum Institute Units)
Concentration of Proshchenkoite-(Y) per GRapi unit = 59.56 (PPM)

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

**Estimated Radioactivity from Proshchenkoite-(Y)** - 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 / 7.40 cm	386,597	1.04E-05	16,789.40	5.52
100 gm / 3.43 cm	38,660	1.04E-06	1,678.94	0.55
10 gm / 1.59 cm	3,866	1.04E-07	167.89	0.06
1 gm / 7.40 mm	387	1.04E-08	16.79	0.01
0.1 gm / 3.43 mm	39	1.04E-09	1.68	0.00
0.01 gm / 1.59 mm	4	1.04E-10	0.17	0.00
0.001 gm / 0.74 mm	0	1.04E-11	0.02	0.00

Weight of pure Proshchenkoite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.72 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

Proshchenkoite-(Y) Classification

Dana Class:

54.03.01.03 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.03)Dana Type

(54.03.01)Vicanite Group

54.03.01.01 Vicanite-(Ce) (Ca,Ce,La,Th)15As(As0.5,Na0.5)FeSi6B4O40F7 R 3m 3m

54.03.01.02 Hundholmenite-(Y)! (Y,REE,Ca,Na)15(Al,Fe)CaxAs1-x(Si,As)Si6B3(O,F)48 R 3m 3m

54.03.01.03 Proshchenkoite-(Y)! (Y,REE,Ca,Na,Mn)15FeCa(P,Si)Si6B3(O,F)48 R 3m 3m

Strunz Class:

09.AJ.35 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra,

09.AJ.35 Okanoganite-(Y) (Na,Ca)3(Y,Ce)12Si6B2O27F14 R 3m 3m

09.AJ.35 Vicanite-(Ce) (Ca,Ce,La,Th)15As(As0.5,Na0.5)FeSi6B4O40F7 R 3m 3m

09.AJ.35 Hundholmenite-(Y)! (Y,REE,Ca,Na)15(Al,Fe)CaxAs1-x(Si,As)Si6B3(O,F)48 R 3m 3m

09.AJ.35 Proshchenkoite-(Y)! (Y,REE,Ca,Na,Mn)15FeCa(P,Si)Si6B3(O,F)48 R 3m 3m

Other Proshchenkoite-(Y) Information

References:

NAME( MinMag, v72:1017) PHYS. PROP.(MinMag, v72:1017) OPTIC PROP.(MinMag, v72:1017)

See Also:

Links to other databases for Proshchenkoite-(Y) :
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

Search for Proshchenkoite-(Y) using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Proshchenkoite-(Y) :

Ask about Proshchenkoite-(Y) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Proshchenkoite-(Y) Specimen Label here :

Proshchenkoite-(Y)

(Y,REE,Ca,Na,Mn)15Fe++Ca(P,Si)Si6B3(O,F)48
Dana No: 54.03.01.03 Strunz No: 09.AJ.35
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.