Wallkilldellite Mineral Data

Wallkilldellite Mineral Data +

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General Wallkilldellite Information

Chemical Formula:

Ca4Mn++6As+++++4O16(OH)8·18(H2O)

Composition:

Molecular Weight = 1,505.95 gm

Calcium 10.65 % Ca 14.89 % CaO

Manganese 21.89 % Mn 28.26 % MnO

Arsenic 19.90 % As 30.52 % As₂O₅

Hydrogen 2.94 % H 26.32 % H₂O

Oxygen 44.62 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₄Mn²⁺₆As₄O₁₆(OH)₈·18(H₂O)

IMA Status:

Approved IMA 1983

Locality:

Link to MinDat.org Location Data.

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Wallkilldellite Crystallography

Axial Ratios:

a:c = 1:3.61051

Cell Dimensions:

a = 6.506, c = 23.49, Z = 1; V = 861.08 Den(Calc)= 2.90

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmc

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

By Intensity(I/I_o): 11.5(1), 5.61(0.9), 2.844(0.6),

Physical Properties of Wallkilldellite

Cleavage:

[0001] Perfect

Color:

Dark red.

Density:

2.85

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

light orange

Optical Properties of Wallkilldellite

Gladstone-Dale:

CI meas= -0.131 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.111 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.251,KPDmeas= 0.2554,KC= 0.2259

Optical Data:

Uniaxial (-), w=1.728.

Calculated Properties of Wallkilldellite

Electron Density:

r_electron=2.86 gm/cc
note: r_{Wallkilldellite}=2.90 gm/cc.

Fermion Index

Fermion Index = 0.00036
Boson Index = 0.99964

Photoelectric:

PE_{Wallkilldellite}= 19.98 barns/electron
U=PE_{Wallkilldellite} x r_electron= 57.08 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wallkilldellite is Not Radioactive

Wallkilldellite Classification

Dana Class:

42.4.12.1 (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.52-10 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 Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Wallkilldellite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 - Franklin Minerals(Dunn) 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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

Wallkilldellite

Ca4Mn++6As+++++4O16(OH)8·18(H2O)
Dana No: 42.4.12.1 Strunz No: VII/D.52-10
Locality:

Notes: