Petroleum Quartz

Clear quartz with pockets of trapped oil still sitting inside it. The yellow blobs are the giveaway in daylight; under a UV lamp the same pockets answer back in bright blue-white, which is how you tell petroleum from ordinary iron staining.

This piece gets a price when it is ready to sell.

Hardness

Mohs 7

Crystal system

trigonal

Family

quartz with fluid inclusions

Luster

vitreous

Streak

white

Cleavage

none

Where quartz is found in the field, on the rockhounding map