Tree Agate

Tree agate is chalcedony — a fine-grained form of quartz — threaded with dendritic inclusions of manganese or iron oxide that branch across the stone like the bare canopy of winter. The name captures the appearance precisely: dendrite comes from the Greek for tree, and the patterns they make are exactly that — a miniature forest frozen in translucent stone. It is not true agate (which is banded chalcedony), but the trade name has been used long enough to stick.

The tradition places tree agate at the heart chakra, which is the green one at the centre of the chest, associated with compassion, belonging and the natural world. Virgo is its zodiac home — an earth sign with a reputation for patience, care and the quiet satisfaction of tending things that grow slowly. The element is earth, which is the tradition's way of saying: this stone belongs to the ground, to what is solid, to the long rhythm beneath the seasons.

The colouring is part of the picture. Green and white reads, in the tradition's visual language, as forest and bark — the living surface of the earth and the structure beneath it. Practitioners reach for tree agate when the week has been too fast and the evening needs something that slows without sedation.

The tradition's quiet suggestion is to give the stone a role in a small, repeated practice. Hold it for a moment in the morning while you name an intention — patience, care for what is growing, an unhurried start — and let it keep the note. At the end of a day that moved too quickly, it offers a physical place for the attention to return to.

Below: the catalogue's gathering of tree agate — tumbled stones, slices and jewellery in this white-and-green register.