A poorly described material, possibly a finely divided mixture of serpentine and a Na-containing phase, from Tyrol, Austria.

The phenomenon by which secondary minerals are formed by crystal growth entirely from solutes without any incorporation of pre-existing structural components from other preexisting (parent) minerals.
See inheritance, transformation

A Ni-rich, planar serpentine where Ni is greater than 50% of the octahedral substitution (Brindley and Wan, 1975), typically Ni_xMg_3-xSi₂O₅(OH)₄. Nepouite forms a series with lizardite, the Mg (platy) end member. Stacking disorder dominates, but specimens may approach monoclinic and orthorhombic stacking sequences. Occurrences are complex, but generally involve weathered ultramafics that produce serpentinites followed by lateritic weathering, as is the case for the Ni deposits of New Caladonia.
Syn., nepouite.

A model to determine the equilibrium reduction potential of a half-cell in an electrochemical cell, such that E_red = E⁰_red – (RT/zF) ln(a_red/a_Ox), where E_red = half-cell reduction potential, E⁰_red = standard half-cell reduction potential, R = ideal gas constant, T = absolute temperature, z = number of electrons transferred in the half-cell, F = Faraday constant, a_red = activity of the reduced species, and a_Ox = activity of the oxidized species. An alternative form of the equation can be used for the total cell potential where E_cell = E⁰_cell – (RT/zF) lnQ, where E_cell is the cell potential or electromotive force, E_cell is the standard cell potential, Q is the reaction quotient, and the other parameters are given above. The Nernst equation is most useful for dilute solutions because concentrations are approximately equal to activities. The equation only applies where there is no current flow at the electrode and also because concentration is approximately equal to activity. Otherwise, corrections must be applied.

A fluid where the viscosity, equal to the ratio of shear stress to shear rate, is constant. A Newtonian fluid is approached in suspensions of water and clay where the clay is fully defloculated.
Cf., dilatancy, quick clay, thixotropy

An obsolete varietal term for nickeloan phlogopite.

A discredited term, a mixture of pimelite and Ni-rich serpentine.

An obsolete name.
See brindleyite

The Ni-rich trioctahedral member of the chlorite group.
See chlorite

See astrophyllite group.