Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.
Habit:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
4-5 - Fluorite-Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Magnetism:
Nonmagnetic
Streak:
white
Optical Properties of Yttrocerite
Optical Data:
Isotropic, n=1.43.
Calculated Properties of Yttrocerite
Electron Density:
Bulk Density (Electron Density)=3.22 gm/cc note: Specific Gravity of Yttrocerite =3.50 gm/cc.
Fermion Index:
Fermion Index = 0.0002285063 Boson Index = 0.9997714937
Photoelectric:
PEYttrocerite = 112.77 barns/electron U=PEYttrocerite x relectron= 362.57 barns/cc.
Radioactivity:
GRapi = 14,495.39 (Gamma Ray American Petroleum Institute Units)
Concentration of Yttrocerite per GRapi unit = 68.99 (PPM)
Yttrocerite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Yttrocerite - 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 / 8.17 cm
331,384
8.96E-06
14,495.39
4.77
100 gm / 3.79 cm
33,138
8.96E-07
1,449.54
0.48
10 gm / 1.76 cm
3,314
8.96E-08
144.95
0.05
1 gm / 8.17 mm
331
8.96E-09
14.50
0.00
0.1 gm / 3.79 mm
33
8.96E-10
1.45
0.00
0.01 gm / 1.76 mm
3
8.96E-11
0.14
0.00
0.001 gm / 0.82 mm
0
8.96E-12
0.01
0.00
Weight of pure Yttrocerite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.50 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 ( 0.74 % Th) From Sum REE Elements (14.79 % REE)
Chemical Formula: 
- weak