Brittle - Generally displayed by glasses and most non-metallic minerals.
Hardness:
5 - Apatite
Luster:
Silky
Optical Properties of Orthojoaquinite-(La)
Gladstone-Dale:
CI meas= 0.041 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1852,KPDmeas= 0.1879,KC= 0.1959 Ncalc = 1.8 - 1.82
Bulk Density (Electron Density)=3.77 gm/cc note: Specific Gravity of Orthojoaquinite-(La) =4.10 gm/cc.
Fermion Index:
Fermion Index = 0.05 Boson Index = 0.95
Photoelectric:
PEOrthojoaquinite-(La) = 186.72 barns/electron U=PEOrthojoaquinite-(La) x relectron= 704.81 barns/cc.
Radioactivity:
GRapi = 19,243.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Orthojoaquinite-(La) per GRapi unit = 51.96 (PPM)
Orthojoaquinite-(La) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Orthojoaquinite-(La) - 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 / 7.75 cm
438,943
1.19E-05
19,243.94
6.33
100 gm / 3.60 cm
43,894
1.19E-06
1,924.39
0.63
10 gm / 1.67 cm
4,389
1.19E-07
192.44
0.06
1 gm / 7.75 mm
439
1.19E-08
19.24
0.01
0.1 gm / 3.60 mm
44
1.19E-09
1.92
0.00
0.01 gm / 1.67 mm
4
1.19E-10
0.19
0.00
0.001 gm / 0.78 mm
0
1.19E-11
0.02
0.00
Weight of pure Orthojoaquinite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.10 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 ( 0.98 % Th) From Sum REE Elements (19.59 % REE)
Chemical Formula: 
- weak