Today any detail is known about this property.
Pyrite, chalcopyrite, galena, and hematite are common rocks that exhibit metallic lusters. These minerals contain metals such as iron, copper, lead, and sulfur, giving them a shiny, metallic appearance.
The chemistry of francium is practically unknown today.
When francium and oxygen react, francium oxide is formed. This compound is highly reactive and unstable due to francium's extreme reactivity. Francium is a highly radioactive element and is extremely rare in nature.
Very probably a reaction of oxydation on the surface.
Clusters.
When francium and hydrogen combine, they form francium hydride (FrH), a compound where francium acts as a cation and hydrogen as an anion. Francium is extremely rare and radioactive, making it difficult to study its chemical properties in detail. The compound would likely be highly unstable due to francium's extreme reactivity.
Not known today but probably francium don't burn.
Francium has not applications and the oxide cannot be prepared.
metallic and non-metallic
Francium is a metal.
Francium was named after France, the country it was dicovered in.
The chemistry of francium is not known; francium has properties similar to caesium.