Ask An Expert

Do you have a rock (or rocks) you’d like to have identified? Use the form to send a photo and as much information as you have about where it came from, and we’ll try to ID it for you. Would you like to know more about the geology of an area in northern Arizona? Are you curious about the kinds of minerals and rocks you’ve encountered? Do you have a question about the different kinds of lapidary equipment, or how to polish a rock? Need advice on tumbling rocks you’ve collected? Any and all questions related to rockhounding, mineral specimen collecting, lapidary arts or other geology related questions are welcome.


CLEAVAGE IN A MINERAL CRYSTAL[Ref1] Cleavage in a mineral is the tendency for the crystal to split along definite  crystallographic planes as exemplified by the rhombohedron cleaved from a calcite crystal shown in Figure 1[Ref1]. These planes of weakness are present within a regular repeating array of atoms and ions within the crystal and are. . . Read More

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