Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Hardness:
5 - Apatite
Luminescence:
Radioactive.
Luster:
Vitreous - Dull
Streak:
white
Optical Properties of Steacyite
Gladstone-Dale:
CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.087 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1772,KPDmeas= 0.1941,KC= 0.1942 Ncalc = 1.57 - 1.63
Optical Data:
Uniaxial (-), e=1.572, w=1.573, bire=0.0010.
Calculated Properties of Steacyite
Electron Density:
Bulk Density (Electron Density)=2.77 gm/cc note: Specific Gravity of Steacyite =2.95 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PESteacyite = 568.46 barns/electron U=PESteacyite x relectron=1,575.62 barns/cc.
Radioactivity:
GRapi = 506,988.54 (Gamma Ray American Petroleum Institute Units)
Concentration of Steacyite per GRapi unit =1,972.43 (PPB)
Steacyite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.65 cm
11,331,574
3.06E-04
506,988.54
166.68
100 gm / 4.02 cm
1,133,157
3.06E-05
50,698.85
16.67
10 gm / 1.86 cm
113,316
3.06E-06
5,069.89
1.67
1 gm / 8.65 mm
11,332
3.06E-07
506.99
0.17
0.1 gm / 4.02 mm
1,133
3.06E-08
50.70
0.02
0.01 gm / 1.86 mm
113
3.06E-09
5.07
0.00
0.001 gm / 0.87 mm
11
3.06E-10
0.51
0.00
Weight of pure Steacyite in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.95 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
Chemical Formula: 
- strong