Hi, today i've analysed a sample of 'Varlamoffite' from Portugal. The results show, besides the peaks of the stannite (in the sample and probably the origin of the 'varlamoffite'), something very close to the cassiterite. That was mentioned, also, by Jambor et al (1995) in the American Mineralogist, Volume 80, pages 845-850 «Specimens from the Tigrinoye deposit were investigated by all of the methods. X-ray powder diagrams (diffractometer) showed the presence of diffraction lines at 3.35(100,110), 2.63(90,101), 1.75(50,211), and 1.67 A (30,220), corresponding to a cassiterite-like structure with a smaller cell size.»
The data are not conclusive, but we seem to be present something structurally close to the cassiterite. Given the width of the peaks we, also, can venture to say that the 'Varlamoffite' is present as smaller crystallites than cassiterite... Is it right?
Edited 1 time(s). Last edit at 01/13/2012 07:27PM by Pedro Alves.