Fiberclay
Fiberclay is a combination of clay and glass fiber and is therefore also called clayfibre. A fiberclay pot often has a similar appearance to a pot made of earthenware or clay, but is lighter thanks to the addition of fiberglass. Clayfibre flower pots are also extremely resistant to moisture, frost, and sun, and last for many years.
Fiberclay can be compared to
ficonstone, with the difference that sand and crushed stone are also added.