Duftite

Formula : PbCuAsO4(OH)

Family: 
Arsenate
Space group: 
Orthorhombic - HM symbol ( 2 2 2) Space Group P21 21 21
High temperature: 
low temperature (surface)
Geological context: 
Secondary mineral in the oxidized zone of hydrothermal base metal deposits

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
 V°
cm3·mol-1
 ΔGºf
J·mol-1
 ΔHºf
J·mol-1
 Sº
J·mol-1·k-1
 CP
J·mol-1·K-1
426.673 64.628 (Ref.: 00bla/bid) Bladh K.W., Bideaux R.A., Anthony-Morton E., Nichols B.G. (2000) The Handbook of Mineralogy Volume IV, Mineralogical Society of America. -960773 (Ref.: 01gas/aza) Gaskova O., Azaroual M., Piantone, P., Lassin A. (2001) - Arsenic behaviour in subsurface hydrogeochemical systems - A critical review of thermodynamic data forarsenic minerals and aqueous species - A compilation of arsenic surface complexation reactions. BRGM Report RP-51356-FR, 78 p.
CP(T) = a + b·T + ·c·T-2 (T in Kelvin)
a
J·mol-1·K-1
 b * 103
J·mol-1·K-2
 c * 10-5
J·K·mol-1
 Maier Kelley Ref.
Reaction properties

Duftite + 3H+ ⇌ H2AsO4- + Cu+2 + Pb+2 + H2O

298.15 K, 1 bar log10K: -1.97 ΔH°r: J·mol-1 (Ref.: )
T(°C) 0 25 60 100 150 200 250 300
log10K -1.97 -1.97 -1.97 -1.97 -1.97 -1.97 -1.97 -1.97
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-1.973984 0.000000 0.000000 0.000000 0.000000