Delvauxite Mineral Data + 
|
- 42.6.6.1 Delvauxite CaFe4(PO4,SO4)2(OH)8·4-6(H2O)(?) None
- VII/D.55-05 Bolivarite Al2(PO4)(OH)3·4-5(H2O) None
- VII/D.55-10 Delvauxite CaFe4(PO4,SO4)2(OH)8·4-6(H2O)(?) None
General Delvauxite Information |
|||
 Chemical Formula: |
CaFe+++4(PO4,SO4)2(OH)8·4-6(H2O) (?) | ||
| 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 | |||
| Empirical Formula: |
Ca0.75Mg0.25Fe3+3.9Al0.2(PO4)2.8(SO4)1.1(CO3)0.2(OH)8·4.7(H2O) | ||
| Environment: |
In a gossan. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1838 | ||
| Locality: |
Berneau, near Visé, Liège, Belgium. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named after J.S.P.J. Delvaux de Feuffe (1782-1863), Belgian chemist who first described and analyzed the mineral. | ||
| Synonym: |
Borickite - 42.6.6.2 | ||
Delvauxite Image | |||
|
Images:
|
|
||
Delvauxite Crystallography |
|||
| Crystal System: |
Amorphous- No Crystals | ||
Physical Properties of Delvauxite |
|||
| Cleavage: |
None | ||
| Color: |
Yellowish brown, Brown, Reddish brown, Brownish black. | ||
| Density: |
1.8 - 2, Average = 1.9 | ||
| Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | ||
| Habit: |
Amorphous - No crystalline form or imitative shape. | ||
| Habit: |
Concretionary - Rounded massive fine-grained materials. | ||
| Habit: |
Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite). | ||
| Hardness: |
2.5 - Finger Nail | ||
| Luster: |
Vitreous - Greasy | ||
| Streak: |
yellow | ||
Optical Properties of Delvauxite |
|||
| Gladstone-Dale: |
CI meas= -0.5 (Poor) - where the CI = (1-KPDmeas/KC) KPDmeas= 0.3789,KC= 0.2526 |
||
| Optical Data: |
Isotropic, n=1.72. | ||
Calculated Properties of Delvauxite |
|||
| Electron Density: |
relectron=1.90 gm/cc |
||
| Fermion Index |
Fermion Index = 0.00669 Boson Index = 0.99331 |
||
| Photoelectric: |
PEDelvauxite = 8.62 barns/electron |
||
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Delvauxite is Not Radioactive |
||
Delvauxite Classification |
|||
| Dana Class: |
42.6.6.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen | ||
| (42.6)where (AB)2 (XO4) Zq · x(H2O) | |||
| (42.6.6)Dana Group | |||
| Strunz Class: |
VII/D.55-10 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.55 - Bolivarite - Delvauxite series | |||
Other Delvauxite Information |
|||
| References: |
NAME( AntBidBlaNic4) PHYS. PROP.(Duda&Rejl90) OPTIC PROP.(Ford32) | ||
| See Also: |
Links to other databases for Delvauxite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 - Minerals of Wisconsin 13 -QUT Mineral Atlas 14 -École des Mines de Paris Search for Delvauxite using: Visit our Advertisers for Delvauxite : Translate Delvauxite Mineral Data : Ask about Delvauxite here : Print or Cut-and-Paste your Delvauxite Specimen Label here :
|
||
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |