Properties - illustrates some of the common cleavage...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
illustrates some of the common cleavage directions of minerals. Observe the minerals shown in Figures 1.5 and 1.15. These minerals have broken with regularity and exhibit cleavage. The crystals produced are in the form of a cube. Although there are six planes of cleavage surrounding each crystal, each exhibits only three directions of cleavage: top and bottom form one parallel set of planes—hence the first direction of cleavage; the two sides are a second parallel set—a second direction of cleavage; and the front and back form the third direction of cleavage. The cleavage of both minerals is described as three directions of cleavage that intersect at 90° (also commonly called cubic cleavage). Cleavage and crystal form are not the same. Some mineral crystals cleave while others do not. Cleavage is determined by the bonds that hold atoms together, while crystal form results from the internal, orderly arrangement of the atoms. The best way to determine whether or not a mineral cleaves is to break it and carefully examine the results. Minerals that do not exhibit cleavage when broken
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/03/2011 for the course PHYS 114 taught by Professor Comptonw during the Summer '10 term at Purdue University.

Ask a homework question - tutors are online