Chistyakovaite-(Y) Mineral Data

General Chistyakovaite-(Y) Information

Chemical Formula:

Al(UO2)2(AsO4)2(F,OH)•6.5H2O

Composition:

Molecular Weight = 969.53 gm

Uranium 49.10 % U 55.70 % UO₂

Aluminum 2.67 % Al 5.05 % Al₂O₃

Arsenic 14.14 % As 21.69 % As₂O₅

Phosphorus 0.54 % P 1.24 % P₂O₅

Hydrogen 1.38 % H 12.37 % H₂O

Oxygen 31.04 % O

Fluorine 1.12 % F 1.12 % F

- % F -0.47 % -O=F₂

______ ______

100.00 % 96.70 % = TOTAL OXIDE

Empirical Formula:

Al_0.96(UO₂)₂(AsO₄)_1.83(PO₄)_0.17F_0.57OH_0.31ï¿½6.5(H₂O)

Environment:

Occurs in samples collected in the 1950s from the supergene zone of the Bota-Burum deposit. Related to threadgoldite

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Bota-Burum deposit, south of Alakol' Lake, southwestern Balkhash area, Zhambyl (Dzhambul) Region, Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for N.I. Chistyakova, a senior assistant at the All-Russia Research Institute of Mineral Resources (VIMS).

Synonym:

IMA2005-003

Chistyakovaite-(Y) Crystallography

Axial Ratios:

a:b:c =2.0418:1:2.004

Cell Dimensions:

a = 19.99, b = 9.79, c = 19.62, Z = 8; beta = 110.7° V = 3,591.80 Den(Calc)= 3.59

Crystal System:

Monoclinic Space Group: P 2/m, P 2 or Pm

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

By Intensity(I/I_o): 9.14(1), 9.34(1), 4.76(0.27),4.87(0.2), 4.93(0.18), 3.55(0.15), 2.281(0.13),

Physical Properties of Chistyakovaite-(Y)

Cleavage:

{100} Perfect, {001} Imperfect

Color:

Yellow.

Density:

3.62

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Hardness:

2.5 - Finger Nail

Luminescence:

Fluorescent, Short UV=bright green, Long UV=green.

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Chistyakovaite-(Y)

Gladstone-Dale:

CI meas= -0.082 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.091 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1594,KPDmeas= 0.1581,KC= 0.1461
Ncalc = 1.52 - 1.53

Optical Data:

Biaxial (-), a=1.557, b=1.58, g=1.58, bire=0.0230, 2V(Calc)=0, 2V(Meas)=10. Dispersion none.

Calculated Properties of Chistyakovaite-(Y)

Electron Density:

Bulk Density (Electron Density)=3.20 gm/cc
note: Specific Gravity of Chistyakovaite-(Y) =3.62 gm/cc.

Fermion Index:

Fermion Index = 0.0036864254
Boson Index = 0.9963135746

Photoelectric:

PE_{Chistyakovaite-(Y)}=1,271.27 barns/electron
U=PE_{Chistyakovaite-(Y)} x r_electron=4,066.35 barns/cc.

Radioactivity:

GRapi = 3,698,226.13 (Gamma Ray American Petroleum Institute Units)
Concentration of Chistyakovaite-(Y) per GRapi unit = 270.40 (PPB)

Chistyakovaite-(Y) 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) 8.22 ± 2.06 grams of pure Chistyakovaite-(Y) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 822.47 ±205.62 grams of pure Chistyakovaite-(Y) .

**Estimated Radioactivity from Chistyakovaite-(Y)** - very strong
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 / 8.08 cm	87,892,825	2.38E-03	3,698,226.13	1,215.86
100 gm / 3.75 cm	8,789,283	2.38E-04	369,822.61	121.59
10 gm / 1.74 cm	878,928	2.38E-05	36,982.26	12.16
1 gm / 8.08 mm	87,893	2.38E-06	3,698.23	1.22
0.1 gm / 3.75 mm	8,789	2.38E-07	369.82	0.12
0.01 gm / 1.74 mm	879	2.38E-08	36.98	0.01
0.001 gm / 0.81 mm	88	2.38E-09	3.70	0.00

Weight of pure Chistyakovaite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.62 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

Chistyakovaite-(Y) Classification

Dana Class:

42.11.13.04 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq ï¿½ x(H2O)

(42.11.13)Vanuralite Group

42.11.13.01 Vanuralite Al(UO2)2(VO4)2(OH)•11(H2O) A2/a 2/m

42.11.13.02 Metavanuralite Al(UO2)2(VO4)2(OH)•8(H2O) P 1or P1 Tri

42.11.13.03 Threadgoldite Al(UO2)2(PO4)2(OH)•8(H2O) C 2/c 2/m

42.11.13.04 Chistyakovaite-(Y)! Al(UO2)2(AsO4)2(F,OH)•6.5H2O P 2/m, P 2 or Pm Mono

Strunz Class:

08.EB.20 08 - PHOSPHATES, ARSENATES, VANADATES

08.E - Uranyl Phosphates and Arsenates

08.EB -UO2:RO4 = 1:1

08.EB.20 Threadgoldite Al(UO2)2(PO4)2(OH)•8(H2O) C 2/c 2/m

08.EB.20 Chistyakovaite-(Y)! Al(UO2)2(AsO4)2(F,OH)•6.5H2O P 2/m, P 2 or Pm Mono

Other Chistyakovaite-(Y) Information

References:

NAME( AmMin, v91, p1945) PHYS. PROP.(AmMin, v91, p1945) OPTIC PROP.(AmMin, v91, p1945)

See Also:

Links to other databases for Chistyakovaite-(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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Chistyakovaite-(Y)

Al(UO2)2(AsO4)2(F,OH)•6.5H2O
Dana No: 42.11.13.04 Strunz No: 08.EB.20
Locality:

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