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Evansite Mineral Data

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General Evansite Information

Help on Chemical  Formula: Chemical Formula: Al3(PO4)(OH)6•6(H2O) (?)
Help on Composition: Composition: Molecular Weight = 386.05 gm
   Aluminum    20.97 %  Al   39.62 % Al2O3
   Phosphorus   8.02 %  P    18.38 % P2O5
   Hydrogen     4.70 %  H    42.00 % H2O
   Oxygen      66.31 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al3(PO4)(OH)6•6(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1864
Help on Locality: Locality: Zelezn�k Mt, Sirk, Slovakia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the English metallurgist, Brooke Evans (1797-1862),
Help on Name Pronunciation: Name Pronunciation: Evansite Say EVANSITE

Evansite Image

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Comments: Cream-colored, amorphous evansite coating an unknown striated, prismatic mineral, now missing (see hollow shells)..
Location: Cobalt, Idaho. Scale: Picture size 3 cm.
© John Veevaert

Evansite Crystallography

Help on Crystal System: Crystal System: Amorphous- No Crystals

Physical Properties of Evansite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White, Yellow, Green, Blue.
Help on Density: Density: 1.9 - 2, Average = 1.95
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Habit: Habit: Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Evansite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2487,KC= 0.2584
Ncalc = 1.49 - 1.52
Help on Optical Data: Optical Data: Isotropic, n=1.485.

Calculated Properties of Evansite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.02 gm/cc
note: Specific Gravity of Evansite =1.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0003253368
Boson Index = 0.9996746632
Help on Photoelectric: Photoelectric: PEEvansite = 1.11 barns/electron
U=PEEvansite x rElectron Density= 2.23 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Evansite is Not Radioactive

Evansite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.01)where (A)3 (XO4) Zq � x(H2O)
  (42.01.02)Dana Group Evansite Al3(PO4)(OH)6•6(H2O)(?) None
Help on  Strunz Class: Strunz Class: 08.DF.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DF -With only medium-sized cations, (OH,etc.):RO4 > 3:1
08.DF.10 Bolivarite Al2(PO4)(OH)3•4-5(H2O) None
08.DF.10 Evansite Al3(PO4)(OH)6•6(H2O)(?) None
08.DF.10 Liskeardite (Al,Fe)3(AsO4)(OH)6•5(H2O) Unk Ortho
08.DF.10 Rosieresite (Pb,Cu,Al)(PO4)x•n(H2O) None

Other Evansite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Duda&Rejl90) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Evansite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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


Al3(PO4)(OH)6•6(H2O) (?)
Dana No: Strunz No: 08.DF.10





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