White
Quartz has a white streak.
Amethyst, being quartz, would have a white streak.
Rose quartz typically exhibits a pale to medium pink color with a white streak.
Pyrite and gold leave streaks because they are softer than the streak plate, allowing fine particles to be left behind. Quartz is harder than the streak plate, so it does not leave a streak when rubbed against it.
Tiger Eye, a form of quartz, would have a white streak, as would all forms of quartz.
Quartz has a white streak.
The mineral Quartz leaves a colorless streak.
Flint is one of many forms of quartz, and its streak will be determined by impurities (non quartz) present. Quartz itself will have a white streak. Flint is a composite formed from quartz, and is not a specific mineral.
Amethyst, being quartz, would have a white streak.
Rose quartz typically exhibits a pale to medium pink color with a white streak.
Pyrite and gold leave streaks because they are softer than the streak plate, allowing fine particles to be left behind. Quartz is harder than the streak plate, so it does not leave a streak when rubbed against it.
White.
Tiger Eye, a form of quartz, would have a white streak, as would all forms of quartz.
Diamond and quartz are colorless minerals that also have a colorless streak. This means that when these minerals are scratched against a white ceramic plate, they leave behind a streak that is also colorless.
The term "sterak" is not commonly used in relation to quartz. It's possible that you may be referring to the term "streak," which is the color of the powdered form of a mineral. The streak for quartz is typically white, but can vary depending on impurities present in the specimen.
White. All forms of quartz will have a white streak, regardless of specimen color.
A mineral that can scratch glass but not a streak plate is quartz. Quartz has a hardness of 7 on the Mohs scale, which allows it to scratch glass (which has a hardness of about 5.5) but is harder than the streak plate, typically made from porcelain, which has a hardness of around 6-7. Therefore, while quartz can leave scratches on glass, it will not produce a streak on a streak plate.