Hello, I am writing to inquire about the derivation of the densities of Hematite (Hm) and Goethite (Gt) in "thermo_minteq.tdat" database.
Recently, I have come across some discrepancies in the reported densities of Hm and Gt from different sources. According to “thermo_minteq.tdat” database, the densities are both 2.650 g/cm3 (as shown in the attached screenshot in a PDF file). However, other sources, such as the Powder Diffraction Files (PDFs, also attached) and some crystallochemical database (http://database.iem.ac.ru/mincryst/s_carta.php?HEMATITE+1919; http://database.iem.ac.ru/mincryst/s_carta.php?GOETHITE+1774), report different values of 5.273 g/cm3 and 4.256 g/cm3 for Hm and Gt, respectively.
To ensure the accuracy of the densities used in my study, I conducted a preliminary test and obtained value for the density of Hm, being 2.530 g/cm3, that were very close to those in the “thermo_minteq.tdat” database. Therefore, I would greatly appreciate it if you could provide me with details about how the densities of Hm and Gt were derived in "thermo_minteq.tdat" database. Your help would be invaluable to me, and I look forward to your response. Thanks!
thermo_minteq.tdat
Goethite PDF#81-0464.pdf
Hematite PDF#79-1741.pdf
screenshot.pdf
