The most unreliable (variable) diagnostic property of minerals such as quartz is

The most unreliable variable in diagnosing the property minerals such as quartz is their color as it is not consistent with the use of such external factors. The color could change, that is why it is considered to be unreliable in diagnosing some of the minerals.

it will or they will call your parents and you get is not in your me i know the feeling kinda dumb > .>