Cacoxenite Mineral Data

Cacoxenite Mineral Data +

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General Cacoxenite Information

Chemical Formula:

(Fe+++,Al)25(PO4)17O6(OH)12·75(H2O)

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

Empirical Formula:

Fe²⁺_18.75Al_6.25(PO₄)₁₇O₆(OH)₁₂·75(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1825

Locality:

Link to MinDat.org Location Data.

Name Origin:

From the Greek kakos, meaning "wrong" and xenos, meaning "guest.;"

Synonym:

ICSD 30834

Kakoxen

PDF 14-331

Cacoxenite Image

Images:

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

Images:

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

Axial Ratios:

a:c = 1:0.38662

Cell Dimensions:

a = 27.559, c = 10.655, Z = 3; V = 7,008.27 Den(Calc)= 3.19

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/I_o): 11.9(1), 23.1(1), 9.1(0.14),

Crystal Structure:

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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

Cleavage:

None

Color:

Brownish yellow, Green, Yellow, Golden yellow, Red yellow.

Density:

2.3 - 3.4, Average = 2.84

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.

Hardness:

3-3.5 - Calcite-Copper Penny

Luminescence:

None.

Luster:

Silky

Streak:

yellow

Optical Properties of Cacoxenite

Dichroism (e):

non.

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

Optical Data:

Uniaxial (+), w=1.58-1.585, e=1.64-1.65, bire=0.0600-0.0650.

Calculated Properties of Cacoxenite

Electron Density:

r_electron=2.89 gm/cc
note: r_Cacoxenite=2.85 gm/cc.

Fermion Index

Fermion Index = 0.00523
Boson Index = 0.99477

Photoelectric:

PE_Cacoxenite= 7.48 barns/electron
U=PE_Cacoxenite x r_electron= 21.63 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cacoxenite is Not Radioactive

Cacoxenite Classification

Dana Class:

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

(42.13)Dana Type

(42.13.5)Dana Group

42.13.5.1 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12·75(H2O) P 6/mmm 6/m 2/m 2/m

Strunz Class:

VII/D.11-50 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.11 - Strunzite series

VII/D.11-10 Ferrostrunzite FeFe2(PO4)2(OH)2·6(H2O) P 1,P1 Tri

VII/D.11-20 Strunzite MnFe2(PO4)2(OH)2·6(H2O) P1 1

VII/D.11-30 Ferristrunzite FeFe2(PO4)2(OH)3·5(H2O) P1,P 1 Tri

VII/D.11-40 Bermanite MnMn2(PO4)2(OH)2·4(H2O) P 2₁ 2

VII/D.11-50 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12·75(H2O) P 6/mmm 6/m 2/m 2/m

VII/D.11-60 Tinticite Fe5(PO4,VO4)4·7(H2O) P1 1

VII/D.11-70 Beraunite FeFe5(PO4)4(OH)5·4(H2O) C 2/c 2/m

VII/D.11-71 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4·6(H2O) Mono

VII/D.11-90 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-100 Gormanite Fe3Al4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-110 Dufrenite FeFe4(PO4)3(OH)5·2(H2O) C 2/c 2/m

VII/D.11-120 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12·4(H2O) C 2/c 2/m

VII/D.11-130 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6·2(H2O) C 2/c 2/m

VII/D.11-135 Ercitite! Na(Mn,Fe)(PO4)(OH)·2(H2O) P 2₁/n 2/m

VII/D.11-140 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11·3(H2O) P 2/c 2/m

VII/D.11-150 Meurigite! KFe7(PO4)5(OH)7·8(H2O) C 2,Cm,C 2/m Mono

Other Cacoxenite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Cacoxenite

(Fe+++,Al)25(PO4)17O6(OH)12·75(H2O)
Dana No: 42.13.5.1 Strunz No: VII/D.11-50
Locality:

Notes: