Low-temperature hydrothermal mineral, formed by alteration of earlier REE-rich minerals. New structure type with Si12O30 sheets with 4- ,6- and 14 member rings.
IMA Status:
Approved IMA 2006 (Dana # Added)
Locality:
Mt. Kukisvumchorr, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Name Origin:
Named for Victor N. Yakovenchuk, a mineralogist at the Geological Institute of the Kola Science Centre of the Russian Academy of Sciences.
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Yakovenchukite-(Y)
Gladstone-Dale:
CI meas= 0.08 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1954,KPDmeas= 0.1865,KC= 0.2026 Ncalc = 1.55 - 1.57
Bulk Density (Electron Density)=2.64 gm/cc note: Specific Gravity of Yakovenchukite-(Y) =2.70 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEYakovenchukite-(Y) = 54.32 barns/electron U=PEYakovenchukite-(Y) x relectron= 143.52 barns/cc.
Radioactivity:
GRapi = 11,687.32 (Gamma Ray American Petroleum Institute Units)
Concentration of Yakovenchukite-(Y) per GRapi unit = 85.56 (PPM)
Yakovenchukite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Yakovenchukite-(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 / 8.91 cm
250,825
6.78E-06
11,687.32
3.84
100 gm / 4.14 cm
25,083
6.78E-07
1,168.73
0.38
10 gm / 1.92 cm
2,508
6.78E-08
116.87
0.04
1 gm / 8.91 mm
251
6.78E-09
11.69
0.00
0.1 gm / 4.14 mm
25
6.78E-10
1.17
0.00
0.01 gm / 1.92 mm
3
6.78E-11
0.12
0.00
0.001 gm / 0.89 mm
0
6.78E-12
0.01
0.00
Weight of pure Yakovenchukite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.70 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
Yakovenchukite-(Y) Classification
Dana Class:
71.05.02.01(71)Phyllosilicate Sheets of Six-Membered Rings
Chemical Formula: Small.jpg)
- weak