Which term denotes the characteristic crystal shape or form of a mineral?

• A. Graining
• B. Growth Marks
• C. Habit
• D. Resorption

Answer: (C)

Habit describes the characteristic crystal shape or form of a mineral. This term captures the external morphology—the usual, recognizable shape a crystal tends to grow into under its conditions, such as tabular, prismatic, bladed, or fibrous forms. That external form is precisely what mineralogists refer to when they talk about a mineral’s habit, making it the best descriptor for the mineral’s typical crystal shape. Graining refers to a mosaic-like texture or the appearance of many small crystals together. Growth marks are the lines or grooves on crystal faces that indicate interruptions in growth. Resorption is the dissolution process that can erode or alter crystal faces. Together, these terms describe other aspects of crystal surface or internal structure, while habit specifically names the characteristic external shape.