Petroleum Quartz are a rare diamond quartz with tiny drops of high energy petroleum inside. Many of them are naturally double terminated. Some of the Petroleum Quartz contain black and brown inclusions which are asphaltite that if heated would release petroleum. The amount of petroleum varies in each small quartz and is usually under 1mm in size. The tiny drop(s) of petroleum show up much more clearly under a black light as petroleum is fluorescent.
The Petroleum Quartz range from 1/4" to just over 1/2"
