Most common crystal caves in the market are amethyst caves.
White crystal clusters are outward-looking and radial crystal energy bodies, while amethyst caves are inward-looking and aggregated, which is easy to receive, release, gather and disperse in geomantic omen. Amethyst Cave is formed by the infiltration and condensation of groundwater containing silicon dioxide from the edge of Agate Cave. When many small amethysts grow densely together, amethyst flowers will form, which, like amethyst caves, have the functions of blocking rush, avoiding evil spirits and gathering wealth in feng shui.
In addition, there are some crystal caves in other colors. Most companies and houses display amethyst caves. The good color of making money and gathering wealth makes Crystal Cave have such a market.
I hope the answer can help you.