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Delvauxite Mineral Data

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General Delvauxite Information

Help on Chemical  Formula: Chemical Formula: CaFe+++4(PO4,SO4)2(OH)8•4-6(H2O) (?)
Help on Composition: Composition: Molecular Weight = 863.66 gm
   Calcium      3.48 %  Ca    4.87 % CaO
   Magnesium    0.70 %  Mg    1.17 % MgO
   Aluminum     0.62 %  Al    1.18 % Al2O3
   Iron        25.22 %  Fe   36.06 % Fe2O3
   Phosphorus  10.04 %  P    23.01 % P2O5
   Hydrogen     2.03 %  H    18.15 % H2O
   Carbon       0.28 %  C     1.02 % CO2
   Sulfur       4.08 %  S    10.20 % SO3
   Oxygen      53.54 %  O
              ______        ______ 
              100.00 %       95.65 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.75Mg0.25Fe3+3.9Al0.2(PO4)2.8(SO4)1.1(CO3)0.2(OH)8�4.7(H2O)
Help on Environment: Environment: In a gossan.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1838
Help on Locality: Locality: Berneau, near Vise, Li�ge, Belgium. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after J.S.P.J. Delvaux de Feuffe (1782-1863), Belgian chemist who first described and analyzed the mineral.
Help on Name Pronunciation: Name Pronunciation: Delvauxite + Pronunciation Say DELVAUXITE
Help on Synonym: Synonym: Borickite -

Delvauxite Image

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Comments: Pure botryoidal massive delvauxite.
Location: Kutna Hora, Stredocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Delvauxite Crystallography

Help on Crystal System: Crystal System: Amorphous- No Crystals

Physical Properties of Delvauxite

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellowish brown, Brown, Reddish brown, Brownish black.
Help on Density: Density: 1.8 - 2, Average = 1.9
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Amorphous - No crystalline form or imitative shape.
Help on Habit: Habit: Concretionary - Rounded massive fine-grained materials.
Help on Habit: Habit: Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: yellow

Optical Properties of Delvauxite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.5 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.3789,KC= 0.2526
Ncalc = 1.45 - 1.51
Help on Optical Data: Optical Data: Isotropic, n=1.72.

Calculated Properties of Delvauxite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.90 gm/cc
note: Specific Gravity of Delvauxite =1.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0066938383
Boson Index = 0.9933061617
Help on Photoelectric: Photoelectric: PEDelvauxite = 8.62 barns/electron
U=PEDelvauxite x rElectron Density= 16.36 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Delvauxite is Not Radioactive

Delvauxite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.06)where (AB)2 (XO4) Zq � x(H2O)
  (42.06.06)Dana Group Delvauxite CaFe4(PO4,SO4)2(OH)8•4-6(H2O)(?) None
Help on  Strunz Class: Strunz Class: 08.DM.35 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DM -With large and medium-sized cations, (OH, etc.):RO4 > 2:1
08.DM.35 Delvauxite CaFe4(PO4,SO4)2(OH)8•4-6(H2O)(?) None

Other Delvauxite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Duda&Rejl90) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Delvauxite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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


CaFe+++4(PO4,SO4)2(OH)8•4-6(H2O) (?)
Dana No: Strunz No: 08.DM.35





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