Andreas (Andrei) Eremeevich Arzruni ( Armenian: Անդրեաս (Անդրեյ) Երեմիայի Արծրունի; 27 November (9 December) 1847 in Moscow – 10 (22) September 1898 in Hohenhonof, Germany) was an Armenian- Russian mineralogist and geologist. [1] [2] [3] He was Grigor Artsruni's brother.