Quartz has a white streak.
pink
Tiger Eye, a form of quartz, would have a white streak, as would all forms of quartz.
White
Quartz is harder than the streak plate, so instead of some of the quartz rubbing off and leaving a streak, when you rub quartz on the plate you're just scratching the plate itself.
Amethyst, being quartz, would have a white streak.
White. All forms of quartz will have a white streak, regardless of specimen color.
White.
pink
Tiger Eye, a form of quartz, would have a white streak, as would all forms of quartz.
The streak color of a crystal is also called the powder color: the color of the grains produced when it is dragged along a hard flat, white surface.
Scratching a mineral across a streak plate will result in a streak which represents the true color of a mineral without impurities or inclusions that can influence a particular specimen's color. The mineral quartz can appear in a wide variety of colors, but the streak of any colored quartz specimen will still be white. The 'streak' color is one characteristic of a mineral which will aid in its identification.
White
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.
Well, first of all, find out its color, streak, fracture, and other stuff
What you are referring to is called a streak test. It's used as an aid to mineral identification. As a mineral is drawn over the unglazed tile surface, it is reduced to a streak of dust which reveals the true color of the mineral. If no color is revealed, the streak color is called white. An amethyst crystal which appears purplish will actually have a white streak, because the streak color of the constituent quartz is white. The purplish color of amethyst is due to other reasons.
Quartz is harder than the streak plate, so instead of some of the quartz rubbing off and leaving a streak, when you rub quartz on the plate you're just scratching the plate itself.
Amethyst, being quartz, would have a white streak.