This Moss Agate is beautiful! When held up to the light, it has dendrites all the way across the stone when held up to the light. I've taken this photo of it against my skin as it might look like this once wrapped and worn as a necklace! Moss agate is a semi-precious gemstone, a type of chalcedony with beautiful green, brown, or black dendritic (plant-like) inclusions that look like moss or lichen. It is formed from silicon dioxide (quartz) with iron/manganese oxides; it's prized for its connection to nature, grounding, stability, and tranquility, often called the "gardener's stone" for its association with agriculture and new beginnings.