Question about Phase Names

[jlucas91]

Greetings,

I am using PHREEQC interactive to perform some speciation calculations and obtain phases. I am using phreeqc.dat database and I noticed some phase names have a letter in parenthesis after the phase name. Could anyone tell me what the significance of this notation is? I recognize (g) for gaseous phase but there are some I am not confident I know the meaning of. I am leery of any notations I don't know the meaning of and I don't want to make any mistakes due to a lack of understanding.

For example: Al(OH)3(a)  or Sepiolite(d)

Thanks,
John

[dlparkhurst]

(a) means amorphous. (d) means disordered, or less crystalline. (14A) refers to 14 angstrom spacing of clay planes. FeS(ppt), precipitated, indicates an initial precipitate that is less crystalline. Zn(OH)2(e) indicates a specific crystal form, epsilon.

[jlucas91]

Thanks Dr. Parkhurst. Cleared it right up.

[paznativ]

Thank you!
maybe this legend could be added to the end of the database?

[dlparkhurst]

OK.