Wallkilldellite-(Fe) Mineral Data

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)₈ï¿½18(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.

Name Pronunciation:

Wallkilldellite-(Fe) + Pronunciation

Synonym:

IMA1997-032

Wallkilldellite-(Fe) Image

Images:

Wallkilldellite-(Fe)

Comments: Brown wallkilldellite-(Fe) with reddish cuprite.
Location: Roua Mine, Alpes-Maritimes, Provence-Alpes-CÃ´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:

Hexagonal Space 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:

Diaphaneity:

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
Ncalc = 1.65 - 1.67

Optical Data:

Uniaxial (-), w=1.75.

Calculated Properties of Wallkilldellite-(Fe)

Electron Density:

Bulk Density (Electron Density)=2.97 gm/cc
note: Specific Gravity of Wallkilldellite-(Fe) =3.00 gm/cc.

Fermion Index:

Fermion Index = 0.00532354
Boson Index = 0.99467646

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wallkilldellite-(Fe) is Not Radioactive

Wallkilldellite-(Fe) Classification

Dana Class:

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

(42.04)where (AB)5 (XO4)2 Zq ï¿½ x(H2O)

(42.04.12)Wallkilldellite Group

42.04.12.01 Wallkilldellite Ca4Mn6As4O16(OH)8•18(H2O) P 6/mmc 6/m 2/m 2/m

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

Strunz Class:

08.DL.20 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DL -With large and medium-sized cations, (OH, etc.):RO4 = 2:1

08.DL.20 Wallkilldellite Ca4Mn6As4O16(OH)8•18(H2O) P 6/mmc 6/m 2/m 2/m

08.DL.20 Wallkilldellite-(Fe)! (Ca,Cu)4Fe6[(As,Si)O4]4(OH)8•18(H2O) P 6₃/mmc, P 6₃mc, or P 62c Hex

08.DL.20 Joelbruggerite! Pb3Zn3SbAs2O13(OH) P 3₂1 3 2

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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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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: 42.04.12.02 Strunz No: 08.DL.20
Locality:

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