Protoxide of tin takes fire in the flame of oxidation, and burns with flame and some white vapor into tin acid, or stannic acid.
"A System of Instruction in the Practical Use of the Blowpipe" by Anonymous
Stannic oxide is of interest, since it is the chief compound of tin found in nature.
"An Elementary Study of Chemistry" by William McPherson
It consists of tin dioxide, or stannic oxide (SnO2), and crystallizes in the tetragonal system.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4" by Various