Natural glass inclusions in the form of atolls in an unheated ruby 

Natural glass inclusions in the form of atolls in an unheated ruby from the Thai-Cambodian border (also known as "Siam rubies"). When these rubies are heated at high temperatures, this natural glass acts as a flux and locally dissolves the ruby, destroying the delicate structure seen here. 

🔬: P. Sukkasem

Do you need this micrograph in full resolution for an article, a DUG dissertation, etc.? Do not hesitate to contact us.