Wallkilldellite Mineral Data

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)

Environment:

Massive granular franklinite-willemite ore from a metamorphosed stratiform zinc orebody.

IMA Status:

Approved IMA 1983

Locality:

Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the dell of the Wallkill River, in which both the Sterling Hill and the Franklin deposits were discovered.

Name Pronunciation:

Wallkilldellite + Pronunciation

Wallkilldellite Image

Images:

Wallkilldellite

Comments: Dark red to black tiny crystals in veins in matrix.
Location: Starlera Mine, Val Ferrera, Graubünden, Switzerland. Scale: Picture Size 1 x 1.5 cm.
© Diederik Visser

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 Dipyramidal H-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
Ncalc = 1.64 - 1.66

Optical Data:

Uniaxial (-), w=1.728.

Calculated Properties of Wallkilldellite

Electron Density:

Bulk Density (Electron Density)=2.86 gm/cc
note: Specific Gravity of Wallkilldellite =2.90 gm/cc.

Fermion Index:

Fermion Index = 0.0003623103
Boson Index = 0.9996376897

Photoelectric:

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

Radioactivity:

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

Wallkilldellite Classification

Dana Class:

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

(42.04)where (AB)5 (XO4)2 Zq � 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 Information

References:

NAME( AntBidBlaNic4) 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 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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

Wallkilldellite

Ca4Mn++6As+++++4O16(OH)8•18(H2O)
Dana No: 42.04.12.01 Strunz No: 08.DL.20
Locality:

Notes:

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