Happy Tessin habit Tuesday✨Please read below for more information on this curious crystalline shape. Tessin Habit: A crystal whose hexagonal prism gets continuously thinner towards the tip of the crystal by alternating steep rhombohedral and m prism faces is said to have a Tessin habit (named after the Swiss Kanton Ticino/Tessin). Because this habit occurs in the penninic part of the Alps, it's also called the Penninic habit. Quartz with a Tessin habit seems to have formed at high temperatures (