Copal (smells like Frankincense but a touch sweeter and milder) burned as an incense, and can be placed on an alight charcoal disc inside a heat resistant container. Some find that adding earth or sand can help shield the strong heat.
White Copal has a light and fruity scent. It is said to be cleansing for the spirit and can help with mental and spiritual work. Some say it is burned as an incense for "Purification & Protection". 
This Copal is sourced from Africa in 15g packs