Chernovite-(Y) Mineral Data

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General Chernovite-(Y) Information

Chemical Formula:

YAsO4

Composition:

Molecular Weight = 228.43 gm

Lanthanum 6.08 % La 7.13 % La₂O₃

Yttrium 35.03 % Y 44.48 % Y₂O₃

Arsenic 29.52 % As 45.28 % As₂O₅

Phosphorus 1.36 % P 3.11 % P₂O₅

Oxygen 28.02 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Y_0.9La_0.1(AsO₄)_0.9(PO₄)_0.1

Environment:

In piemontite veinlets in liparite porphyry (Nyarta-Syu-Yu River, Russia); in Alpine-type fissures (Binntal, Switzerland)

IMA Status:

Approved IMA 1987

Locality:

Near the head of the Nyarta-Syu-Yu River, east of Mt. Tel’posiz, Polar Ural Mountains, Russia Link to MinDat.org Location Data.

Name Origin:

Named for Professor Aleksandr Aleksandrovich Chernov (1877-1963), Russian geologist, Institute of Geology, Syktyvar, Russia, explorer of the Polar Urals

Synonym:

ICSD 24513

PDF 13-429

Chernovite-(Y) Image

Images:

Chernovite-(Y)

Comments: Dark brown irregular masses and veinlets of chernovite-(Y) in pale creamy tan-colored matrix.
Location: Montaldo Mine, Piedmont, Italy. Scale: 2 1/4" x 2".
© Chris Wright / Wrights Rock Shop

Chernovite-(Y) Crystallography

Axial Ratios:

a:c = 1:0.89139

Cell Dimensions:

a = 7.09, c = 6.32, Z = 4; V = 317.69 Den(Calc)= 4.78

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

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

By Intensity(I/I_o): 1.811(1), 2.644(1), 3.519(1),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Strada M , Schwendimann G , Gazzetta Chimica Italiana , 64 (1934) p.662-674, La struttura cristallina di alcuni fosfati ed arseniati di metalli trivalenti., II. Arseniato e fosfato di ittrio, Locality: synthetic

Physical Properties of Chernovite-(Y)

Cleavage:

{010} Perfect

Color:

Brown, Colorless, Light yellow.

Density:

4.866

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

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

Habit:

Pseudo Octohedral - Crystals show an octohedral outline.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Chernovite-(Y)

Dichroism (e):

colorless.

Dichroism (w):

pale rose-yellow.

Gladstone-Dale:

CI meas= -0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1738,KPDmeas= 0.1708,KC= 0.1652
Ncalc = 1.79 - 1.8

Optical Data:

Uniaxial (+), w=1.783, e=1.879, bire=0.0960.

Calculated Properties of Chernovite-(Y)

Electron Density:

Bulk Density (Electron Density)=4.43 gm/cc
note: Specific Gravity of Chernovite-(Y) =4.87 gm/cc.

Fermion Index:

Fermion Index = 0.0001892059
Boson Index = 0.9998107941

Photoelectric:

PE_{Chernovite-(Y)}= 94.90 barns/electron
U=PE_{Chernovite-(Y)} x r_electron= 420.47 barns/cc.

Radioactivity:

GRapi = 5,906.17 (Gamma Ray American Petroleum Institute Units)
Concentration of Chernovite-(Y) per GRapi unit = 169.31 (PPM)

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

**Estimated Radioactivity from Chernovite-(Y)** - mild
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 / 7.32 cm	136,212	3.68E-06	5,906.17	1.94
100 gm / 3.40 cm	13,621	3.68E-07	590.62	0.19
10 gm / 1.58 cm	1,362	3.68E-08	59.06	0.02
1 gm / 7.32 mm	136	3.68E-09	5.91	0.00
0.1 gm / 3.40 mm	14	3.68E-10	0.59	0.00
0.01 gm / 1.58 mm	1	3.68E-11	0.06	0.00
0.001 gm / 0.73 mm	0	3.68E-12	0.01	0.00

Weight of pure Chernovite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.87 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 ( 0.30 % Th) From Sum REE Elements ( 6.08 % REE)

Chernovite-(Y) Classification

Dana Class:

38.04.11.02 (38)Anhydrous Phosphates, etc

(38.04)A+ XO4

(38.04.11)Zenotime Group (Tetragonal: I41/amd)

38.04.11.01 Xenotime-(Y) YPO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.02 Chernovite-(Y) YAsO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.03 Wakefieldite-(Y) YVO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.04 Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.05 Pretulite! ScPO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.06 Xenotime-(Yb)! YbPO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.07 Wakefieldite-(La)! LaVO4 I 4₁/amd 4mm

38.04.11.08 Wakefieldite-(Nd)! NdVO4 I 4₁/amd 4mm

Strunz Class:

08.AD.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AD -With only large cations

08.AD.35 Dreyerite BiVO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Chernovite-(Y) YAsO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Pretulite! ScPO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Xenotime-(Y) YPO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Wakefieldite-(Y) YVO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Xenotime-(Yb)! YbPO4 I 4₁/amd 4/m 2/m 2/m

08.AD.35 Wakefieldite-(La)! LaVO4 I 4₁/amd 4mm

08.AD.35 Wakefieldite-(Nd)! NdVO4 I 4₁/amd 4mm

Other Chernovite-(Y) Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Chernovite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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

Chernovite-(Y)

YAsO4
Dana No: 38.04.11.02 Strunz No: 08.AD.35
Locality:

Notes: