Druzy Quarts

Druzy quartz is a layer of tiny, sparkling crystals (usually quartz) that form on the surface or inside host rock, such as in geodes, creating a sugar-like, glittering effect. Commonly used in jewelry.

this durable stone is a Mohs 6-7 comes in various colors of white, greys and browns .

Or very rarely Pink, Red, and Green: Frequently created by natural varieties like Cobaltocalcite (pink) or Uvarovite Garnet (green).