Millisite Mineral Data

General Millisite Information

Chemical Formula:

(Na,K)CaAl6(PO4)4(OH)9•3(H2O)

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

Empirical Formula:

Na_0.75K_0.25CaAl₆(PO₄)₄(OH)₉•3(H₂O)

Environment:

Found in altered phosphate deposits.

IMA Status:

Valid Species (Pre-IMA) 1930

Locality:

Clay Canyon, Fairfield, Utah County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named for F. T. Millis of Lehi, Utah, who found the first specimens.

Name Pronunciation:

Millisite + Pronunciation

Synonym:

Lehiite

Millisite Image

Images:

Millisite

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

Axial Ratios:

a:c = 1:2.72428

Cell Dimensions:

a = 7, c = 19.07, Z = 2; V = 934.43 Den(Calc)= 2.90

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/I_o): 4.73(1), 4.8(1), 4.84(1),

Physical Properties of Millisite

Cleavage:

{001} Good

Color:

Greenish, White, Light gray.

Density:

2.83

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Millisite

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

Optical Data:

Biaxial (+), a=1.584, b=1.598, g=1.602, bire=0.0180

Calculated Properties of Millisite

Electron Density:

Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Millisite =2.83 gm/cc.

Fermion Index:

Fermion Index = 0.0003340493
Boson Index = 0.9996659507

Photoelectric:

PE_Millisite= 2.09 barns/electron
U=PE_Millisite x r_electron= 5.95 barns/cc.

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

Dana Class:

42.07.09.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq ï¿½ x(H2O)

(42.07.09)Dana Group

42.07.09.01 Millisite (Na,K)CaAl6(PO4)4(OH)9•3(H2O) P 4₁2₁2,P 4₃2₁2 4 2 2

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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 :

Millisite

(Na,K)CaAl6(PO4)4(OH)9•3(H2O)
Dana No: 42.07.09.01 Strunz No: 08.DL.10
Locality:

Notes:

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