Spearmint has a sweeter, slightly milder fragrance than peppermint. Spearmint’s fragrant properties can be quite refreshing, and is often used as a "pick me up" oil.
Lemon oil smells just like a newly cut lemon. Lemon oil possesses strong sanitizer properties, and it makes a wonderful air purifier. Lemon essential oil is common for its fresh scent, clean, and it blends well with other oils.
Sandalwood is derived from a class of trees in the genus Santalum. Sandalwood essential oil is pressed from the wood and roots of the East Indian sandalwood tree
Eucalyptus: Eucalyptus derives from the eucalyptus plant that is native to the country of Australia. The oil is created by pressing the leaves of the plant which release the fragrant oil.