Geode- these are formed with a cavity inside lined with a crystalline structure, like a closed shell, usually containing Quartz, Amethyst, Citrine, or Calcite. The geode exhibits several properties along with the properties of the contained mineral. Geodes can facilitate astral travel and assist in the pursuit of mathematics. It furthers the connection to higher forces and supports spiritual growth. This formation is also known for protection and allows you to recognize and analyze the total picture before decision-making. It allows you the freedom to mold and shape your future and helps you attain highly effective communication skills. Geodes assist in breaking addictions and are beneficial for an addictive or overindulgent personality. Roughly:  Small: Opening 0.5"- 1" 0.599oz - 1.975oz (Weight Between 17g - 56g) Small/ Medium: Opening 1"- 1.5" 0.599oz - 1.975oz (Weight Between 17g - 56g) Medium: Opening 1"- 2" 0.705oz - 2.328oz (Weight Between 20 - 66g) Medium/ Large: Opening 1.5"- 2" 1.058oz - 2.328oz (Weight Between 30 - 66g) Large: Opening 1.5"- 2" 1.481oz - 3.17466oz (Weight Between 42 - 90g) Large/ Extra Large: 1.5"- 2.5" 1.763oz - 3.880oz (Weight Between 50 - 110)