PLM Fundamentals:               

Mineral Habit                     

What is Mineral Habit?

The HABIT of a grain is the general shape that it displays. 

What Are Some Common Mineral Habits That Can Be Seen Under The Microscope?


A regular, roughly rectangular form


A regular form like a pushed-over square (rhombus)

FIBROUS - Straight

A long, very thin, linear form


A long, very thin form with waves and bends


A form with no definite shape

How to Determine Habit on a Polarized Light Microscope

Habit is the description of the external form of a mineral grain. Accordingly, any microscope setting that clearly shows the outlines of the grains can be used to determine habit.


How would you describe the habit of grains in the examples below?


To see how your description compares to the instructor's...

© 2001 Wayne G. Powell