r/rocksandminerals

Found it on my morning walk around one potato field in Central Bohemian region of Czech Republic.

Is this real? Shiny, vitreous (glassy) luster, a jet-black rock.

How much do you think this vanadanite is worth? I tried to add a video but it won't let me for some reason. It's about 16"x6". Not the highest quality and has imperfections but it is pretty large. It's longer than my forearm. Peanut butter jar and hand for scale. Lol.

Found a couple of pieces like this in a field near an old creek, Oklahoma

Any ideas??

Google lens said it could be a piece of Meteorite Yes or No?

1. This image illustrates a **fluid-driven metasomatic gradient in which relict garnet is progressively replaced by epidote and amphibole as fluid flux increases across the rock.

2. This image illustrates a fracture-hosted quartz vein acting as a fluid conduit from which channelized retrograde alteration propagates into the surrounding rock.

3. This image illustrates infiltrative dissolution–precipitation replacement of garnet by epidote along a fluid-accessible interface adjacent to a quartz vein.

4. This image illustrates incomplete, patchy replacement of garnet by epidote, preserving relict grain textures within a fluid-driven metasomatic front.

5.This image illustrates grain-scale dissolution–precipitation replacement, with epidote infiltrating and consuming relict garnet along microfractures and grain boundaries.

**6.**This image illustrates heterogeneous, permeability-controlled metasomatism in which epidote preferentially replaces host minerals along microfractures and porous pathways rather than uniformly across the rock.