Mineralogy Database

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
 

Micheelsenite Image

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  Micheelsenite

Comments: Cotton ball bundles of white, fibrous michellsenite crystals on albite.
Location: Mont Saint-Hilaire, Rouville Co., Quebec, Canada. Scale: Sample size 4 x 3 x 1.5 cm.
© Tom Loomis / Dakota Matrix

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 - Pyramidal H-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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.52 - 1.54
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: Bulk Density (Electron Density)=2.12 gm/cc
note: Specific Gravity of Micheelsenite =2.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
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)
Concentration of Micheelsenite per GRapi unit = 376.48 (PPM)

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: 43.05.22.01 (43)Compound Phosphates, etc.
  (43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)
  (43.05.22)Dana Group
 
43.05.22.01 Micheelsenite! (Ca,Y)3Al[PO3OH,CO3](CO3)(OH)6•12(H2O) P 63 6
Help on  Strunz Class: Strunz Class: 08.DO.30 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DO -With CO3, SO4, SiO4
 
08.DO.30 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 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Micheelsenite

(Ca,Y)3Al[PO3OH,CO3](CO3)(OH)6•12(H2O)
Dana No: 43.05.22.01 Strunz No: 08.DO.30
Locality:

 

Notes:

 

 
   
 


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