The mineral Quartz leaves a colorless streak.
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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.
A ruby's streak color appears colorless because as a mineral, ruby typically does not leave a streak when rubbed against a streak plate. The color of a mineral's streak is caused by the powdered form of the mineral, revealing its true color when scratched against a ceramic plate, but in the case of ruby, its hardness and structure prevent it from leaving a visible streak.
The mineral that leaves a black streak is called magnetite. When magnetite is scratched against a white ceramic plate, it leaves a distinctive black streak behind.
Chalcocite does not exhibit a streak because it is a soft mineral that usually leaves a black residue when streaked on a streak plate.
Garnet typically leaves a colorless streak on a streak plate due to its hardness.