FRACTURE

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Another common type is subconchoidal. Similar to conchoidal, just not as curved, but still smooth. Andalusite can show this type.

  • Uneven is a type that is basically self explanatory. It is a common type that is found in anhydrite.

  • Unlike uneven, jagged has sharp points or edges that catch on a finger that's rubbed across the surface. Usually this indicates a metal such as copper , a metal alloy or some sulfides or oxides.

  • Splintery is a fracture type that occurs in fibrous or finely acicular minerals and in minerals that have a relatively stronger structure in one direction than the other two. Chrysotile serpentine is a typical mineral with splintery fracture and kyanite is an example of a non-fibrous mineral that has this fracture.

  • Earthy is a fracture that produces a texture similar to broken children's clay. It is found in minerals that are generally massive and loosely consolidated such as limonite.

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