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Tennantite is a copper arsenic sulfosalt mineral with an ideal formula Cu 12 As 4 S 13. Due to variable substitution of the copper by iron and zinc the formula is Cu 6 [Cu 4 (Fe,Zn) 2]As 4 S 13. [1] It is gray-black, steel-gray, iron-gray or black in color.
Ammonium iron(III) sulfate, NH 4 Fe(SO 4) 2 ·12 H 2 O, or NH 4 [Fe(H 2 O) 6](SO 4) 2 ·6 H 2 O, also known as ferric ammonium sulfate (FAS) or iron alum, is a double salt in the class of alums, which consists of compounds with the general formula AB(SO 4) 2 · 12 H 2 O. [2] It has the appearance of weakly violet, octahedrical crystals.
The Hanoi University of Science and Technology (HUST; Vietnamese: Đại học Bách khoa Hà Nội, lit. 'Hanoi Polytechnic', formerly known in English as Hanoi University of Technology (HUT) until 2010) is the first and largest technical university and the most prestigious university in Vietnam.
The HNUE High School for Gifted Students (Vietnamese: Trường Trung học phổ thông chuyên Đại học Sư phạm), commonly known as HNUE High School (Vietnamese: Chuyên Sư phạm, CSP), is a public magnet school in Hanoi, Vietnam. The school was founded in 1966 as a national educational institution to nurture Vietnamese students who ...