Cacoxenite Mineral Data

Cacoxenite Mineral Data
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General Cacoxenite Information

Help on Chemical Formula: Chemical Formula: (Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)
Help on Composition: Composition: Molecular Weight = 4,481.51 gm
   Aluminum     3.76 %  Al    7.11 % Al2O3
   Iron        23.37 %  Fe   30.06 % FeO
   Phosphorus  11.75 %  P    26.92 % P2O5
   Hydrogen     3.64 %  H    32.56 % H2O
   Oxygen      57.48 %  O
              ______        ______ 
              100.00 %       96.65 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+18.75Al6.25(PO4)17O6(OH)12•75(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1825
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek kakos, meaning "wrong" and xenos, meaning "guest.;"
Help on Name Pronunciation: Name Pronunciation: Cacoxenite + Pronunciation Say CACOXENITE
Help on Synonym: Synonym: ICSD 30834
  Kakoxen
  PDF 14-331
 

Cacoxenite Image

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Cacoxenite

Comments: Radial, spherical individual crystal sprays of brownish yellow cacoxenite.
Location: El Horcajo (Ciudad Real), Spain. Scale: 0.5 mm diameter.
© Tom Loomis / Dakota Matrix
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Cacoxenite   Strengite

Comments: Lilac colored, spear-head shape crystals of strengite to 5mm in large, open vug associated with golden fibrous cacoxenite.
Location: Coon Creek, Polk Co., Arkansas, USA. Scale: Picture size 2 cm.
© Tom Loomis / Dakota Matrix

Cacoxenite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.38662
Help on Cell Dimensions: Cell Dimensions: a = 27.559, c = 10.655, Z = 3; V = 7,008.27 Den(Calc)= 3.19
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11.9(1), 23.1(1), 9.1(0.14),
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Moore P B , Shen J , Nature , 306 (1983) p.356-358, An X-ray structural study of cacoxenite, a mineral phosphate, Locality: Avant s Claim, near Shady, Polk County, Arkansas, USA

 

Physical Properties of Cacoxenite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish yellow, Green, Yellow, Golden yellow, Red yellow.
Help on Density: Density: 2.3 - 3.4, Average = 2.84
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Silky
Help on Streak: Streak: yellow
 

Optical Properties of Cacoxenite

Help on Dichroism (e): Dichroism (e): non.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.069 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.168 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1924,KPDmeas= 0.2154,KC= 0.2312
Ncalc = 1.53 - 1.79
Help on Optical Data: Optical Data: Uniaxial (+), w=1.58-1.585, e=1.64-1.65, bire=0.0600-0.0650.
 

Calculated Properties of Cacoxenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.89 gm/cc
note: Specific Gravity of Cacoxenite =2.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0052348676
Boson Index = 0.9947651324
Help on Photoelectric: Photoelectric: PECacoxenite = 7.48 barns/electron
U=PECacoxenite x rElectron Density= 21.63 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cacoxenite is Not Radioactive
 

Cacoxenite Classification
Help on Dana Class: Dana Class: 42.13.05.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.13)Dana Type
  (42.13.05)Dana Group
 
42.13.05.01 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12•75(H2O) P 6/mmm 6/m 2/m 2/m
Help on Strunz Class: Strunz Class: 08.DC.40 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
 
08.DC.40 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12•75(H2O) P 6/mmm 6/m 2/m 2/m
 

Other Cacoxenite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Cacoxenite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Cacoxenite

(Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)
Dana No: 42.13.05.01 Strunz No: 08.DC.40
Locality:

 

Notes: