The February Birthstone is Amethyst
Amethyst that formed when large crystals grew in open spaces inside a geode. 
The February birthstone is Amethyst. Amethyst is a purple variety of the well known Quarts crystal and is a semiprecious gemstone. It is known to be the traditional birthstone for February.
The hardness of Amethyst is the same as Quartz (Moh’s scale 7) and it suitable for many types of jewelry and carved artworks. Decorative geodes can be found at many natural gemstone shops starting with small bookends and going all the up in size to huge monolithic decorative pieces.
- By Didier Descouens (Own work) GFDL or [CC BY-SA 3.0], via Wikimedia Commons
- By Geschichtsmecki.Geschichtsmecki at de.wikipedia [Public domain], from Wikimedia Commons
- By Didier Descouens (Own work) [GFDL or CC BY-SA 3.0], via Wikimedia Commons
- © Marie-Lan Nguyen Wikimedia Commons, via Wikimedia Commons