Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is an amorphous material known as a  mineraloid .. The result is a volcanic glass with a smooth uniform texture that breaks with a conchoidal fracture (see photo on right). Obsidian is usually an extrusive rock-one that solidifies above Earth's surface. However, it can form in a variety of cooling environments: Black is the most common color of obsidian.
â¢ PEP TALK (noun). The noun PEP TALK has 1 sense: 1. a speech of exhortation attempting to instill enthusiasm and determination in a team or staff. Familiarity information: PEP TALK used as a noun is very rare.
Peplum is an old word, but very few of us actually know what it means. Thatâs why I am here to give you the modern-day definition. A peplum is the tutu like look that is created at the bottom of jackets and shirts or at the waist of dresses and skirts. Itâs a short, flared, gathered strip of fabric which creates a tutu like appearance.