What is Moss Agate? Moss Agate is a form of chalcedony included in the Agate family. It is a semi-precious stone made from silicon dioxide. Moss Agate has green colored minerals throughout which look like moss. It also has brown or black shades in the patterns. Moss Agate has a meaning that is about uplifting and soothing. Chakras - Heart Chakra Zodiac - Virgo Planet - Moon Element - Earth Meaning of Moss Agate Throughout history, moss agate has been attributed with various symbolic meanings. These meanings range from improving one’s mental and emotional balance to enhancing one’s communication skills. The stone is believed to stimulate creativity and promote self-expression. It is also said to help one connect with nature and the earth, providing grounding energy.