| |
 |
Delvauxite Mineral Data
|
|
|
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 Vise, Li�ge, 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. |
| Name Pronunciation: |
Delvauxite + Pronunciation  |
| 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
Ncalc = 1.45 - 1.51 |
| Optical Data: |
Isotropic, n=1.72. |
| |
Calculated Properties of Delvauxite
|
| Electron Density: |
Bulk Density (Electron Density)=1.90 gm/cc
note: Specific Gravity of Delvauxite =1.90 gm/cc.
|
| Fermion Index: |
Fermion Index = 0.0066938383
Boson Index = 0.9933061617 |
| Photoelectric: |
PEDelvauxite = 8.62 barns/electron
U=PEDelvauxite x rElectron Density= 16.36 barns/cc.
|
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Delvauxite is Not Radioactive |
| |
Delvauxite Classification
|
| Dana Class: |
42.06.06.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
| |
(42.06)where (AB)2 (XO4) Zq � x(H2O) |
| |
(42.06.06)Dana Group |
| |
42.06.06.01 Delvauxite CaFe4(PO4,SO4)2(OH)8•4-6(H2O)(?) None |
| 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
|
| 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 - 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
Search for Delvauxite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Delvauxite :
Ask about Delvauxite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Español
Print or Cut-and-Paste your Delvauxite Specimen Label here :
|
Delvauxite
CaFe+++4(PO4,SO4)2(OH)8•4-6(H2O) (?)
Dana No: 42.06.06.01 Strunz No: 08.DM.35
Locality:
Notes:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.
