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 % As2 O5
Hydrogen 2.94 % H 26.32 % H2 O
Oxygen 44.62 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca4 Mn2+ 6 As4 O16 (OH)8 •18(H2 O)
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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEWallkilldellite = 19.98 barns/electronU=PEWallkilldellite x r Electron 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 63 mc, or P 6 2c 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 63 mc, or P 6 2c Hex
08.DL.20 Joelbruggerite ! Pb3Zn3SbAs2O13(OH) P 32 1 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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