How can you tell between quart and a crystal? Because i found one but I don't know if it is a quart or crystal.
If your identification is correct, then the mineral would have no cleavage and irregular, conchoidal fracture, would scratch glass, and would be scratched by a nail. In addition it would not react in acid. If there were crystal faces they would typically be striated and would reveal a 6-sided crystal. Another possibility is one of the feldspars, orthoclase. Orthoclase, however, has cleavage and won't scratch glass. Both Orthoclase feldspar and quarts will leave a white streak.
Quartz would have vitreous luster and coinchoidal fracture (breaks like glass or a seashell) No cleavage You can scratch a nail with it (quartz has a hardness of 7) Quartz will leave a white streak
