These characteristic fractures are also helpful in mineral identification. Quartz and malachite fracture with shell-like curves. Native metals often break leaving jagged edges. Some properties, such as magnetism and luminescence, are not present in all minerals but can be useful in identifying certain minerals or mineral groups. Some minerals have a unique texture, odor, or taste.
Minerals have different densities.
Equal amounts of similar looking minerals may have very different weights. Minerals that contain metals, such as lead or iron, are heavier than other minerals. Carbonates can be easily identified by a simple acid test. The calcite in the carbonate is partially dissolved by acid resulting in the release of carbon dioxide. To test for carbonates, place a drop of vinegar or dilute hydrochloric acid on the mineral sample.