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Wallkilldellite Mineral Data

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General Wallkilldellite Information

Help on Chemical  Formula: Chemical Formula: Ca4Mn++6As+++++4O16(OH)8•18(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca4Mn2+6As4O16(OH)8•18(H2O)
Help on Environment: Environment: Massive granular franklinite-willemite ore from a metamorphosed stratiform zinc orebody.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the dell of the Wallkill River, in which both the Sterling Hill and the Franklin deposits were discovered.
Help on Name Pronunciation: Name Pronunciation: Wallkilldellite + Pronunciation Say WALLKILLDELLITE

Wallkilldellite Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:3.61051
Help on Cell Dimensions: Cell Dimensions: a = 6.506, c = 23.49, Z = 1; V = 861.08 Den(Calc)= 2.90
Help on Crystal System: 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/Io): 11.5(1), 5.61(0.9), 2.844(0.6),

Physical Properties of Wallkilldellite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Dark red.
Help on Density: Density: 2.85
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light orange

Optical Properties of Wallkilldellite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (-), w=1.728.

Calculated Properties of Wallkilldellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.86 gm/cc
note: Specific Gravity of Wallkilldellite =2.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0003623103
Boson Index = 0.9996376897
Help on Photoelectric: Photoelectric: PEWallkilldellite = 19.98 barns/electron
U=PEWallkilldellite x rElectron Density= 57.08 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wallkilldellite is Not Radioactive

Wallkilldellite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.04)where (AB)5 (XO4)2 Zq � x(H2O)
  (42.04.12)Wallkilldellite Group Wallkilldellite Ca4Mn6As4O16(OH)8•18(H2O) P 6/mmc 6/m 2/m 2/m Wallkilldellite-(Fe)! (Ca,Cu)4Fe6[(As,Si)O4]4(OH)8•18(H2O) P 63/mmc, P 63mc, or P 62c Hex
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 08.DL.20





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