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 - TrapezohedralH-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 · 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

Search for Millisite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Millisite :

A Bijoux Google Search for Millisite
Adam's Minerals Google Search for Millisite
Cape Minerals Google Search for Millisite
Dakota Matrix Minerals Google Search for Millisite
Excalibur Mineral Corp. Google Search for Millisite
Exceptional Minerals Google Search for Millisite
John Betts Fine Minerals Search for Millisite
McDougall Minerals Google Search for Millisite
Mineral News Website Link
Rock and Mineral Shows Google Search for Millisite
Weinrich Minerals, Inc. Google Search for Millisite

Ask about Millisite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: