Dufrenite Mineral Data + |
General Dufrenite Information |
|||
Chemical Formula: | Fe++Fe+++4(PO4)3(OH)5ˇ2(H2O) | ||
Composition: | Molecular Weight = 685.22 gm | ||
Iron 40.75 % Fe 10.49 % FeO / 46.61 % Fe2O3 | |||
Phosphorus 13.56 % P 31.07 % P2O5 | |||
Hydrogen 1.32 % H 11.83 % H2O | |||
Oxygen 44.36 % O | |||
______ ______ | |||
100.00 % 100.00 % = TOTAL OXIDE | |||
Empirical Formula: | Fe2+Fe3+4(PO4)3(OH)5ˇ2(H2O) | ||
Environment: | Secondary mineral. | ||
IMA Status: | Valid Species (Pre-IMA) 1833 | ||
Locality: | Anglar, Haute-Vienne, Limousin, France Link to MinDat.org Location Data. | ||
Name Origin: | Named for Armand Small Dufrenoy (1792-1857), French mineralogist and geologist. | ||
Synonym: | ICSD 34830 | ||
PDF 22-1143 | |||
Dufrenite Image | |||
Images: |
|
||
Dufrenite Crystallography |
|||
Axial Ratios: | a:b:c =5.0409:1:2.6882 | ||
Cell Dimensions: | a = 25.84, b = 5.126, c = 13.78, Z = 4; beta = 111.2° V = 1,701.72 Den(Calc)= 2.67 | ||
Crystal System: | Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c | ||
X Ray Diffraction: | By Intensity(I/Io): 3.151(1), 5.002(0.9), 12(0.9), | ||
Crystal Structure:
Mouse |
| ||
Physical Properties of Dufrenite |
|||
Cleavage: | [???] Perfect, [???] Distinct | ||
Color: | Brown, Greenish brown, Green black, Dark green, Olive green. | ||
Density: | 3.2 - 3.4, Average = 3.3 | ||
Diaphaniety: | Subtranslucent to opaque | ||
Fracture: | Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
Habit: | Fibrous - Crystals made up of fibers. | ||
Habit: | Massive - Uniformly indistinguishable crystals forming large masses. | ||
Habit: | Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) | ||
Hardness: | 3.5-4 - Copper Penny-Fluorite | ||
Luminescence: | Non-fluorescent. | ||
Luster: | Silky | ||
Streak: | green | ||
Optical Properties of Dufrenite |
|||
Optical Data: | Biaxial (+/-), a=1.82-1.842, b=1.83-1.85, g=1.875-1.925, bire=0.0550-0.0830, 2V(Calc)=38-52, 2V(Meas)=0-90. Dispersion relatively strong. | ||
Calculated Properties of Dufrenite |
|||
Electron Density: | relectron=2.62 gm/cc |
||
Fermion Index | Fermion Index = 0.00885 Boson Index = 0.99115 |
||
Photoelectric: | PEDufrenite = 12.78 barns/electron |
||
Radioactivity: | GRapi = 0 (Gamma Ray American Petroleum Institute Units) Dufrenite is Not Radioactive |
||
Dufrenite Classification |
|||
Dana Class: | 42.9.1.2 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen | ||
(42.9)where (A)3 (XO4)2 Zq ˇ x(H2O) | |||
(42.9.1)Dana Group | |||
Strunz Class: | VII/D.11-110 VII - Phosphates, Arsenates and Vanadates | ||
VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe | |||
VII/D.11 - Strunzite series | |||
Other Dufrenite Information |
|||
References: | NAME( Dana7) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
See Also: | Links to other databases for Dufrenite : 1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - Crocoite.com Mineral Locations 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Dufrenite using: Visit our Advertisers for Dufrenite : Translate Dufrenite Mineral Data : Ask about Dufrenite here : Print or Cut-and-Paste your Dufrenite Specimen Label here :
|
||