Types of fracture are:

  • Conchoidal (shell like) which results in concentric concave ridges
  • Subconchoidal, which is similar to conchoidal but less prominant, often lacking the concentric ridges.
  • Even. A fairly smooth, flat break that may visually resemble a cleavage plane.
  • Granular. A fine-grained break resembling the surface of a sugar cube.
  • Spintery. A fibrous break that resemles splintered wood.
  • Uneven. A general catagory used to describe fractures with an irregualr appearance such as aggregate gem materials like Serpentine.
  • Steplike. Breaks that may be a combination of cleavages in more than one direction or a combination of cleavages and fractures.