What is the tendency of certain minerals to break along smooth, parallel planes called? Crystal form Luster Streak Cleavage

## Step 1<br />The question is asking for the term that describes the tendency of certain minerals to break along smooth, parallel planes. This is a characteristic of minerals and is used to identify them.<br /><br />## Step 2<br />The options provided are: Crystal form, Luster, Streak, and Cleavage. Each of these terms refers to a different characteristic of minerals.<br /><br />## Step 3<br />Crystal form refers to the external shape of a crystal, which is determined by the internal arrangement of atoms.<br /><br />## Step 4<br />Luster refers to the way a mineral reflects light. It can be metallic, glassy, dull, etc.<br /><br />## Step 5<br />Streak refers to the color of the powder produced when a mineral is dragged across an unglazed porcelain plate.<br /><br />## Step 6<br />Cleavage, on the other hand, refers to the tendency of certain minerals to break along smooth, parallel planes. This is the characteristic that the question is asking for.