In this image you can see quartz crystals of type " Maramureş diamond" found in the Ukrainian Carpathians. The size of these crystals of 3-6 mm. Appearance (habitus) - rhombohedral. There is every reason to believe a quartz indicator migration of hydrocarbon fluids in the formation or destruction of gas condensate and oil deposits. Practical value: the content of hydrocarbon inclusions in quartz possible to predict the chemical composition of hydrocarbon deposits.