Chinese
Name:石油水晶、石油石英、油膽水晶、石油閃靈鑽、金水膽石英
English Name: Petroleum Quartz, Golden Enhydros, Petroleum Crystal, Petroleum Herkimer, Petroleum Enhydro Quartz, Petroleum Included Quartz
Chemical Composition:SiO2
Crystal System:Trigonal
Hardness:7.0
SG:2.65
RI:1.544 - 1.553 (Double
refraction +0.009)
Birthstone:April
Related Chakra: All chakras, especially: Crown, Solar Plexus
Locality: Pakistan
Remarks:Herkimer like single quartz crystal with pockets of asphaltite, petroleum and air bubbles. Great fluorescence under both LWUV (365nm) and SWUV(254nm). Very rare specimen, they are loved by mineral / gemstone collectors. (Asphaltite is a mixture of hydrocarbon.)
Source:Herkimer Quartz are found in limestone rock which has been dated at about 500 million years old.
It's usually doubly-terminated, often associated with inclusions of petroleum and/or associated with oil or coal deposits within sedimentary rocks. All such quartz crystals formed under low-temperature hydrothermal conditions in the sedimentary rocks.
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