Kapitsaite-(Y) Mineral Data

General Kapitsaite-(Y) Information

Chemical Formula:

(Ba,K,Pb,Na)4(Y,Ca,REE)2[Si8B2(B,Si)2O28F]

Composition:

Molecular Weight = 1,419.80 gm

Potassium 0.83 % K 1.00 % K₂O

Barium 33.85 % Ba 37.80 % BaO

Sodium 0.16 % Na 0.22 % Na₂O

Calcium 1.98 % Ca 2.76 % CaO

La,Ce,Pr,Nd,Sm, 2.03 % RE 2.37 % REE₂O₃

Yttrium 6.26 % Y 7.95 % Y₂O₃

Silicon 16.42 % Si 35.12 % SiO₂

Boron 2.66 % B 8.58 % B₂O₃

Lead 2.92 % Pb 3.14 % PbO

Oxygen 31.55 % O

Fluorine 1.34 % F 1.34 % F

- % F -0.56 % -O=F₂

______ ______

100.00 % 99.72 % = TOTAL OXIDE

Empirical Formula:

Ba_3.5K_0.3Pb_0.2YCa_0.7Na_0.1REE_0.2Si_8.3B_3.5O₂₈F

Environment:

Found in a boulder of perialkaline pegmatite. The Y-dominant analogue of hyalotekite.

IMA Status:

Approved IMA 1998, Dana # Added

Locality:

Moraine of the Dara-i-Pioz glacier in the Alaiskii mountain range, Tien-Shan, northern Tajikistan. Link to MinDat.org Location Data.

Name Origin:

Named for P. L. Kapitsa (1894-1984), Russian physicist.

Synonym:

IMA1998-057

Kapitsaite-(Y) Crystallography

Axial Ratios:

a:b:c =1.0305:1:0.9448

Cell Dimensions:

a = 11.181, b = 10.85, c = 10.252, Z = 2; alpha = 90.64°, beta = 90.05°, gamma = 89.97° V = 1,243.63 Den(Calc)= 3.79

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: I1

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

By Intensity(I/I_o): 3.77(1)(202), 2.9(0.9)(312), 2.93(0.8)(321,231), 3.24(0.75)(013), 3.73(0.7)(300), 7.8(0.7)(110),

Physical Properties of Kapitsaite-(Y)

Cleavage:

None

Color:

Light pink, White.

Density:

3.74

Diaphaneity:

Semitransparent

Fracture:

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

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Kapitsaite-(Y)

Gladstone-Dale:

CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1661,KPDmeas= 0.1684,KC= 0.1695
Ncalc = 1.63 - 1.64

Optical Data:

Biaxial (+), a=1.624, b=1.628, g=1.637, bire=0.0130, 2V(Calc)=68, 2V(Meas)=69. Dispersion r < v moderate.

Calculated Properties of Kapitsaite-(Y)

Electron Density:

Bulk Density (Electron Density)=3.43 gm/cc
note: Specific Gravity of Kapitsaite-(Y) =3.74 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_{Kapitsaite-(Y)}= 218.41 barns/electron
U=PE_{Kapitsaite-(Y)} x r_electron= 749.19 barns/cc.

Radioactivity:

GRapi = 2,002.54 (Gamma Ray American Petroleum Institute Units)
Concentration of Kapitsaite-(Y) per GRapi unit = 499.37 (PPM)

**Estimated Radioactivity from Kapitsaite-(Y)** - mild
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 / 7.99 cm	45,851	1.24E-06	2,002.54	0.66
100 gm / 3.71 cm	4,585	1.24E-07	200.25	0.07
10 gm / 1.72 cm	459	1.24E-08	20.03	0.01
1 gm / 7.99 mm	46	1.24E-09	2.00	0.00
0.1 gm / 3.71 mm	5	1.24E-10	0.20	0.00
0.01 gm / 1.72 mm	0	1.24E-11	0.02	0.00
0.001 gm / 0.80 mm	0	1.24E-12	0.00	0.00

Weight of pure Kapitsaite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.74 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 ( 0.10 % Th) From Sum REE Elements ( 2.03 % REE)

Kapitsaite-(Y) Classification

Dana Class:

78.06.01.02 (78)Unclassified silicates

(78.06)possible tectosilicates

(78.06.01)Dana Group

78.06.01.01 Hyalotekite (Ba,Pb,Ca,K)6(B,Si,Al)2(Si,Be)10O28(F,Cl) I1 1

78.06.01.02 Kapitsaite-(Y)! (Ba,K,Pb,Na)4(Y,Ca,REE)2[Si8B2(B,Si)2O28F] I1 1

Strunz Class:

09.CH.05 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CH -[Si4O12]8- 4-membered double rings

09.CH.05 Hyalotekite (Ba,Pb,Ca,K)6(B,Si,Al)2(Si,Be)10O28(F,Cl) I1 1

09.CH.05 Kapitsaite-(Y)! (Ba,K,Pb,Na)4(Y,Ca,REE)2[Si8B2(B,Si)2O28F] I1 1

Other Kapitsaite-(Y) Information

References:

NAME( AmMin, vol 86, p 768) PHYS. PROP.(AmMin, Vol 86, p 1535) OPTIC PROP.(CanMin, Vol 38)

See Also:

Links to other databases for Kapitsaite-(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

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Kapitsaite-(Y)

(Ba,K,Pb,Na)4(Y,Ca,REE)2[Si8B2(B,Si)2O28F]
Dana No: 78.06.01.02 Strunz No: 09.CH.05
Locality:

Notes:

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