Old material from Russia that was made during the Soviet era. The clear stripe is from the seed crystal that was used to grow the piece. Russian synthetic quartz was often grown using the hydrothermal method. This process involves dissolving silica in a superheated solution and allowing it to crystallize on a seed crystal, resulting in high-purity quartz with excellent optical properties. The white line from the seed crystal is a characteristic feature of this growth method

39.81 grams / 71.7 x 31.4 x 10.1 mm