This is an orgonite pyramid, a spiritual tool made from a mix of organic materials (resin and crystals) and inorganic materials (metal). People use them as decorative items and for metaphysical purposes.
It is believed to absorb negative electromagnetic waves and convert them into positive energy.
The pyramid shape is considered ideal for attracting and removing energy.
The item in the image appears to contain amethyst and potentially other crystals like peridot.
It is widely used in yoga, meditation, and spirituality as an energy generator.