The streak color is not an indicator of metallic vs. nonmetallic minerals. Both could have the same color streak.
Titanium is a metallic element. it has the atomic number of 22.
Limestone is not a mineral, it is a rock, and is not classified as metallic or nonmetallic.
water and every thing you eat or drink because ot contains water even purified water has minerals but the most comman is salt
Diamond is made from carbon, which is non-metallic.