Micheelsenite Mineral Data


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General Micheelsenite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Y)3Al[PO3OH,CO3](CO3)(OH)6·12(H2O)
Help on Composition: Composition: Molecular Weight = 667.02 gm
   Calcium     12.02 %  Ca   16.81 % CaO
   Dysprosium   2.44 %  Dy    2.80 % Dy2O3
   Yttrium     13.33 %  Y    16.93 % Y2O3
   Aluminum     3.64 %  Al    6.88 % Al2O3
   Phosphorus   3.25 %  P     7.45 % P2O5
   Hydrogen     4.64 %  H    41.46 % H2O
   Carbon       2.16 %  C     7.92 % CO2
   Oxygen      58.53 %  O
              ______        ______ 
              100.00 %      100.24 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2YDy0.1Al0.9(PO3OH)0.7(CO3)1.2(OH)6·12(H2O)
Help on Environment: Environment: Late-stage hydrothermal product and in pegmatites, hornfels, marble zenoliths, and silicate cavities. Ettringite group, structure
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Mont Saint-Hilaire, Quebec Canada and the Nanna pegmatite, Narsaarsuup Qaava, South Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for H. I. Micheelsen (1931-), of the University of Copenhagen, Denmark.
Help on Synonym: Synonym: IMA1999-033
 

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Micheelsenite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.97118
Help on Cell Dimensions: Cell Dimensions: a = 10.828, c = 10.516, Z = 2; V = 1,067.77 Den(Calc)= 2.07
Help on Crystal System: Crystal System: Hexagonal - PyramidalH-M Symbol (6) Space Group: P 63
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.38(1)(100), 2.491(0.8)(213), 4.59(0.7)(102),2.143(0.65)(223,402), 3.36(0.55)(211), 3.77(0.5)(112),
 

Physical Properties of Micheelsenite

Help on Cleavage: Cleavage: [100] Good, [001] Good
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.15
Help on Diaphaniety: Diaphaniety: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Splintery - Brittle fracture leaving splintery fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Micheelsenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.25,KPDmeas= 0.2407,KC= 0.2528
Help on Optical Data: Optical Data: Uniaxial (-), e=1.503, w=1.532, bire=0.0290.
 

Calculated Properties of Micheelsenite

Help on Electron Density: Electron Density:

relectron=2.12 gm/cc
note: rMicheelsenite =2.07 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01135
Boson Index = 0.98865
Help on Photoelectric: Photoelectric:

PEMicheelsenite = 34.37 barns/electron
U=PEMicheelsenite x relectron= 72.71 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 2,656.20 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Micheelsenite - mild
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 / 9.74 cm 54,571 1.47E-06 2,656.20 0.87
100 gm / 4.52 cm 5,457 1.47E-07 265.62 0.09
10 gm / 2.10 cm 546 1.47E-08 26.56 0.01
1 gm / 9.74 mm 55 1.47E-09 2.66 0.00
0.1 gm / 4.52 mm 5 1.47E-10 0.27 0.00
0.01 gm / 2.10 mm 1 1.47E-11 0.03 0.00
0.001 gm / 0.97 mm 0 1.47E-12 0.00 0.00

Weight of pure Micheelsenite in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.07 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 ( 0.12 % Th) From Sum REE Elements ( 2.44 % REE)
 

Micheelsenite Classification

Help on  Dana Class: Dana Class: 43.5.22.1 (43)Compound Phosphates, etc.
  (43.5)(Hydrated Compound Anions With Hydroxyl or Halogen)
  (43.5.22)Dana Group
 
43.5.22.1 Micheelsenite ! (Ca,Y)3Al[PO3OH,CO3](CO3)(OH)6·12(H2O) P 63 6
Help on  Strunz Class: Strunz Class: V/C.07-210 V - Nitrates, Carbonates and Borates
  V/C - Waterfree carbonates with unfamiliar anions
  V/C.07 - Bastnäsite-(Y) - Mineevite-(Y) series
 
V/C.07-10 Bastnasite-(Y) Y(CO3)F P 62c 6 m2
 
V/C.07-20 Bastnasite-(La) La(CO3)F P 62c 6 m2
 
V/C.07-30 Bastnasite-(Ce) Ce(CO3)F P 62c 6 m2
 
V/C.07-40 Hydroxylbastnasite-(La) La(CO3)(OH) C 2221 2 2 2
 
V/C.07-50 Hydroxylbastnasite-(Ce) Ce(CO3)(OH) P 62c 6 m2
 
V/C.07-60 Hydroxylbastnasite-(Nd) Nd(CO3)(OH) P 62c 6 m2
 
V/C.07-61 Kozoite-(Nd)! (Nd,La,Sm,Pr)(CO3)(OH) Pmcn 2/m 2/m 2/m
 
V/C.07-62 Kozoite-(La)! La(CO3)(OH) Pmcn 2/m 2/m 2/m
 
V/C.07-64 Horvathite-(Y)! NaY(CO3)F2 Pmcn 2/m 2/m 2/m
 
V/C.07-70 Parisite-(Ce) Ca(Ce,La)2(CO3)3F2 R 3 3
 
V/C.07-80 Parisite-(Nd) Ca(Nd,Ce,La)2(CO3)3F2 R 3 3
 
V/C.07-90 Rontgenite-(Ce) Ca2(Ce,La)3(CO3)5F3 R 3 3
 
V/C.07-100 Synchysite-(Y) CaY(CO3)2F C 2/c 2/m
 
V/C.07-110 Synchysite-(Ce) CaCe(CO3)2F C 2/c 2/m
 
V/C.07-120 Synchysite-(Nd) CaNd(CO3)2F Unk Ortho
 
V/C.07-130 Huanghoite-(Ce) BaCe(CO3)2F R 3m 3 2/m
 
V/C.07-140 Cebaite-(Ce) Ba3Ce2(CO3)5F2 C 2/m or C 2 Mono
 
V/C.07-150 Cebaite-(Nd)! Ba3(Nd,Ce)2(CO3)5F2 Unk Mono
 
V/C.07-154 Kukharenkoite-(La)! Ba2(La,Ce)(CO3)3F P 21/m 2/m
 
V/C.07-155 Kukharenkoite-(Ce)! Ba2Ce(CO3)3F P 21/m 2/m
 
V/C.07-160 Zhonghuacerite-(Ce) Ba2Ce(CO3)3F P 21/m 2/m
 
V/C.07-170 Cordylite-(Ce) Ba(Ce,La)2(CO3)3F2 P 63/mmc 6/m 2/m 2/m
 
V/C.07-175 Lukechangite-(Ce)! Na3Ce2(CO3)4F P 63/mmc 6/m 2/m 2/m
 
V/C.07-190 Mineevite-(Y) Na25Ba(Y,Gd,Dy)2(HCO3)4(CO3)11(SO4)2ClF2 P 63/m 6/m
 
V/C.07-200 Reederite-(Y)! Na15Y2(CO3)9(SO3F)Cl P 6 6
 
V/C.07-210 Micheelsenite (Ca,Y)3Al[PO3OH,CO3](CO3)(OH)6·12(H2O) P 63 6
 

Other Micheelsenite Information

Help on References: References: NAME( AmMin, Vol 87, p 356) PHYS. PROP.(AmMin, Vol 87, p 356) OPTIC PROP.(AmMin, Vol 87, p 356)
Help on See Also: See Also: Links to other databases for Micheelsenite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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Micheelsenite

(Ca,Y)3Al[PO3OH,CO3](CO3)(OH)6·12(H2O)
Dana No: 43.5.22.1 Strunz No: V/C.07-210
Locality:

 

Notes:

 

 
   
 
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