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Micaceous - Fracture of flexable micaceous cleavage fragments.
Habit:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Pearly
Streak:
white
Optical Properties of Lanthanite-(La)
Gladstone-Dale:
CI meas= -0.06 (Fair) - where the CI = (1-KPDmeas/KC) CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2062,KPDmeas= 0.2197,KC= 0.2072 Ncalc = 1.54 - 1.58
Estimated Radioactivity from Lanthanite-(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 / 8.82 cm
1,034,993
2.80E-05
46,539.97
15.30
100 gm / 4.10 cm
103,499
2.80E-06
4,654.00
1.53
10 gm / 1.90 cm
10,350
2.80E-07
465.40
0.15
1 gm / 8.82 mm
1,035
2.80E-08
46.54
0.02
0.1 gm / 4.10 mm
103
2.80E-09
4.65
0.00
0.01 gm / 1.90 mm
10
2.80E-10
0.47
0.00
0.001 gm / 0.88 mm
1
2.80E-11
0.05
0.00
Weight of pure Lanthanite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.78 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 ( 2.31 % Th) From Sum REE Elements (46.21 % REE)
Chemical Formula: 
- weak