In the central (ussingite) zone of hyperagpaitic pegmatite in sodalite nepheline syenites and in ussingite veinlets. The manganese analogue of nordite-(Ce) and ferronordite-(Ce).
IMA Status:
Approved IMA 1998 (Dana # Added)
Locality:
Chinlusuia River, Lovozero Alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Name Origin:
Named as the Mn++ dominant analogue of nordite-(Ce). Nordite series is named after the word for north because of its northern origin in the Lovozero Massif.
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Rosette - Bundled tabular aggregates resembling rose flower petals.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
5-5.5 - Apatite-Knife Blade
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Manganonordite-(Ce)
Gladstone-Dale:
CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.06 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1944,KPDmeas= 0.1813,KC= 0.1834 Ncalc = 1.6 - 1.65
Optical Data:
Biaxial (+), a=1.623, b=1.636, g=1.642, bire=0.0190, 2V(Calc)=66, 2V(Meas)=60. Dispersion weak, r > v.
Calculated Properties of Manganonordite-(Ce)
Electron Density:
Bulk Density (Electron Density)=3.30 gm/cc note: Specific Gravity of Manganonordite-(Ce) =3.50 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEManganonordite-(Ce) = 101.66 barns/electron U=PEManganonordite-(Ce) x relectron= 335.51 barns/cc.
Radioactivity:
GRapi = 17,815.79 (Gamma Ray American Petroleum Institute Units)
Concentration of Manganonordite-(Ce) per GRapi unit = 56.13 (PPM)
Manganonordite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Manganonordite-(Ce) - 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 / 8.18 cm
396,212
1.07E-05
17,815.79
5.86
100 gm / 3.79 cm
39,621
1.07E-06
1,781.58
0.59
10 gm / 1.76 cm
3,962
1.07E-07
178.16
0.06
1 gm / 8.18 mm
396
1.07E-08
17.82
0.01
0.1 gm / 3.79 mm
40
1.07E-09
1.78
0.00
0.01 gm / 1.76 mm
4
1.07E-10
0.18
0.00
0.001 gm / 0.82 mm
0
1.07E-11
0.02
0.00
Weight of pure Manganonordite-(Ce) 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 ( 0.88 % Th) From Sum REE Elements (17.69 % REE)
Manganonordite-(Ce) Classification
Dana Class:
72.05.02.06(72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Chemical Formula: 
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- weak