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Millisite Mineral Data

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General Millisite Information

Help on Chemical  Formula: Chemical Formula: (Na,K)CaAl6(PO4)4(OH)9•3(H2O)
Help on Composition: Composition: Molecular Weight = 815.98 gm
   Potassium    1.20 %  K     1.44 % K2O
   Sodium       2.11 %  Na    2.85 % Na2O
   Calcium      4.91 %  Ca    6.87 % CaO
   Aluminum    19.84 %  Al   37.49 % Al2O3
   Phosphorus  15.18 %  P    34.79 % P2O5
   Hydrogen     1.85 %  H    16.56 % H2O
   Oxygen      54.90 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.75K0.25CaAl6(PO4)4(OH)9•3(H2O)
Help on Environment: Environment: Found in altered phosphate deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1930
Help on Locality: Locality: Clay Canyon, Fairfield, Utah County, Utah, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for F. T. Millis of Lehi, Utah, who found the first specimens.
Help on Name Pronunciation: Name Pronunciation: Millisite + Pronunciation Say MILLISITE
Help on Synonym: Synonym: Lehiite

Millisite Image

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Comments: Milky cream-colored crystals of millisite.
Location: Clay Canyon, Fairfield, Utah County, Utah, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Millisite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.72428
Help on Cell Dimensions: Cell Dimensions: a = 7, c = 19.07, Z = 2; V = 934.43 Den(Calc)= 2.90
Help on Crystal System: Crystal System: Tetragonal - Trapezohedral H-M Symbol (4 2 2) Space Group: P 41212,P 43212
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.73(1), 4.8(1), 4.84(1),

Physical Properties of Millisite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Greenish, White, Light gray.
Help on Density: Density: 2.83
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Millisite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.069 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2051,KPDmeas= 0.2101,KC= 0.2202
Ncalc = 1.62 - 1.64
Help on Optical Data: Optical Data: Biaxial (+), a=1.584, b=1.598, g=1.602, bire=0.0180

Calculated Properties of Millisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Millisite =2.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0003340493
Boson Index = 0.9996659507
Help on Photoelectric: Photoelectric: PEMillisite = 2.09 barns/electron
U=PEMillisite x relectron= 5.95 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 17.37 (Gamma Ray American Petroleum Institute Units)
Concentration of Millisite per GRapi unit = 5.76 (%)

Estimated Radioactivity from Millisite - barely detectable


Millisite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.07)where (AB)5 (XO4)3 Zq � x(H2O)
  (42.07.09)Dana Group Millisite (Na,K)CaAl6(PO4)4(OH)9•3(H2O) P 41212,P 43212 4 2 2
Help on  Strunz Class: Strunz Class: 08.DL.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DL -With large and medium-sized cations, (OH, etc.):RO4 = 2:1
08.DL.10 Cyrilovite NaFe3(PO4)2(OH)4•2(H2O) P 412121,P 432121 4 2 2
08.DL.10 Millisite (Na,K)CaAl6(PO4)4(OH)9•3(H2O) P 41212,P 43212 4 2 2
08.DL.10 Wardite NaAl3(PO4)2(OH)4•2(H2O) P 41212 4 2 2

Other Millisite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Millisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Print or Cut-and-Paste your Millisite Specimen Label here :


Dana No: Strunz No: 08.DL.10





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