1) Magnesium mineral 
Quintinite is a carbonate mineral with the chemical formula Mg4Al2(OH)12CO3⋅H2O. The mineral was named after Quinitin Wight of Ottawa, Ontario, Canada (b. 1935), who was a significant contributor to mineral studies at Mont Saint-Hilaire. Quintinite is found as 2H and 3T, or 2-hexagonal and 3-trigonal, polytypes, which were originally approved as...