Mohair Velvet is a type of fabric made from Mohair Wool. It is usually used for upholstery. A velvet is a fabric that is made in a certain way usually ending up with a pile; importantly it can be made from many different fibres including mixtures of fibres.
Cotton velvet – A velvet made from natural cotton
Silk Velvet – Potentially beautiful and amazing velvet fabric made from silk but a high degree of quality variation across manufacturers.
Vicuna Silk Velvet – Extremely high quality and rare luxury fabric. Rarely available as an interiors fabric.
Cotton & Silk Velvet – A less expensive way to strengthen the beauty of the silk with the strength of cotton. Cotton being cheaper than Cashmere wool for example!
Note also that a velvet is made with a back cloth material. It is not unusual for an extremely fine top market velvet to have a 100% cotton back cloth.