I found crystals left under a tree on my

Most likely nothing symbolic at all — that shape usually has a very ordinary explanation.

What it probably is. Crystal clusters like that grow in veins inside granite, schist or quartzite. Tree roots grow right through a vein, they weather the host rock away, and the pieces surface where the soil thins near the trunk. Soil that already holds quartz tends to grow more of it, which is why some spots hand them up again and others never do. So the "message" is usually just geology plus a very persistent tree.

Two practical checks before anything else. Scratch a piece with a steel nail or a knife: quartz leaves a mark, glass doesn't, calcite is softer and fizzes if you drop vinegar on it. And look at where it sits — right at the roots against a fence post or a buried old footing means drainage and digging, not crystals.

If you still want to read it as a sign. There is no agreed meaning. Different traditions assign different things to quartz — clarity, amplification, a magnifying quality — and those texts don't agree with each other. Reading it that way is a choice about how much weight to give it, not a fact the stone came with.

One thing worth asking: are you thinking about these because something in you has already started looking for a sign, or because you'd just like to know what they're made of? The honest answer reads differently depending on which — tell me and I'll draw you a card on it either way.