Lupavý

Lupavý is a term used in geology and mineralogy to describe a specific type of fracture or cleavage in minerals. It refers to a surface that is irregular, uneven, and often exhibits a rough or granular texture, as opposed to the smooth, flat surfaces characteristic of perfect cleavage. Minerals that exhibit lupavý fracture break in a way that does not follow a distinct crystallographic plane. Instead, the fracture surface is unpredictable and can vary significantly from one break to another.

This type of fracture is often observed in minerals that lack well-defined cleavage planes or where the bonds between atoms are not uniformly strong in all directions. When subjected to stress, these minerals tend to break along the weakest points, resulting in the characteristic uneven surfaces. Examples of minerals that can exhibit lupavý fracture include quartz, obsidian, and some types of feldspar.

The presence and appearance of lupavý fracture can be an important diagnostic property for mineral identification, especially when other distinguishing features are absent or unclear. Geologists and mineralogists examine the nature of fracture surfaces to understand the internal structure and bonding of a mineral sample. While not as precise as cleavage for identification, lupavý fracture provides valuable information about how a mineral responds to mechanical force.