Wallkilldellite-(Fe) Mineral Data

Wallkilldellite-(Fe) Mineral Data +

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General Wallkilldellite-(Fe) Information

Chemical Formula:

(Ca,Cu)4Fe6[(As,Si)O4]4(OH)8·18(H2O)

Composition:

Molecular Weight = 1,506.74 gm

Calcium 9.58 % Ca 13.40 % CaO

Iron 22.24 % Fe 28.61 % FeO

Copper 1.69 % Cu 2.11 % CuO

Silicon 0.56 % Si 1.20 % SiO₂

Arsenic 18.40 % As 28.22 % As₂O₅

Hydrogen 2.94 % H 26.30 % H₂O

Oxygen 44.60 % O

______ ______

100.00 % 99.84 % = TOTAL OXIDE

Empirical Formula:

Ca_3.6Cu_0.4Fe²⁺₆(AsO₄)_3.7(SiO₄)_0.3(OH)₈·18(H₂O)

Environment:

Occurs as an oxidation product in a Cu, Ag mine.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Roua mine (Alpes-Maritimes, France) Link to MinDat.org Location Data.

Name Origin:

Named as the Fe++ dominant analog of wallkilldellite.

Synonym:

IMA1997-032

Wallkilldellite-(Fe) Image

Images:

Wallkilldellite-(Fe)

Comments: Brown wallkilldellite-(Fe) with reddish cuprite.
Location: Roua Mine, Alpes-Maritimes, Provence-Alpes-C?te d'Azur, France. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Wallkilldellite-(Fe) Crystallography

Axial Ratios:

a:c = 1:3.54459

Cell Dimensions:

a = 6.548, c = 23.21, Z = 1; V = 861.83 Den(Calc)= 2.90

Crystal System:

HexagonalSpace Group: P 6₃/mmc, P 6₃mc, or P 62c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 11.6(1), 5.67(0.8), 3.275(0.7),1.64(0.25), 2.76(0.15),

Physical Properties of Wallkilldellite-(Fe)

Cleavage:

[001] Perfect

Color:

Brownish yellow.

Density:

Diaphaniety:

Translucent

Fracture:

Fragile - Crystals with a delicate and easily injured structure.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous - Resinous

Streak:

light brown

Optical Properties of Wallkilldellite-(Fe)

Gladstone-Dale:

CI meas= -0.12 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.159 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2586,KPDmeas= 0.25,KC= 0.2232

Optical Data:

Uniaxial (-), w=1.75.

Calculated Properties of Wallkilldellite-(Fe)

Electron Density:

r_electron=2.97 gm/cc
note: r_{Wallkilldellite-(Fe)}=3.00 gm/cc.

Fermion Index

Fermion Index = 0.00532
Boson Index = 0.99468

Photoelectric:

PE_{Wallkilldellite-(Fe)}= 20.57 barns/electron
U=PE_{Wallkilldellite-(Fe)} x r_electron= 61.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wallkilldellite-(Fe) is Not Radioactive

Wallkilldellite-(Fe) Classification

Dana Class:

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

(42.4)where (AB)5 (XO4)2 Zq · x(H2O)

(42.4.12)Dana Group

42.4.12.1 Wallkilldellite Ca4Mn6As4O16(OH)8·18(H2O) P 6/mmc 6/m 2/m 2/m

42.4.12.2 Wallkilldellite-(Fe) ! (Ca,Cu)4Fe6[(As,Si)O4]4(OH)8·18(H2O) P 6₃/mmc, P 6₃mc, or P 62c Hex

Strunz Class:

VII/D.52-05 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.52 - Wallkilldellite series

VII/D.52-05 Wallkilldellite-(Fe) (Ca,Cu)4Fe6[(As,Si)O4]4(OH)8·18(H2O) P 6₃/mmc, P 6₃mc, or P 62c Hex

VII/D.52-10 Wallkilldellite Ca4Mn6As4O16(OH)8·18(H2O) P 6/mmc 6/m 2/m 2/m

Other Wallkilldellite-(Fe) Information

References:

NAME( AmMin, Vol 86) PHYS. PROP.(AmMin, vol 86) OPTIC PROP.(AmMin, Vol 86)

See Also:

Links to other databases for Wallkilldellite-(Fe) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Wallkilldellite-(Fe) Specimen Label here :

Wallkilldellite-(Fe)

(Ca,Cu)4Fe6[(As,Si)O4]4(OH)8·18(H2O)
Dana No: 42.4.12.2 Strunz No: VII/D.52-05
Locality:

Notes: