Difference between revisions of "Habit"

From The Gemology Project
Jump to: navigation, search
Line 31: Line 31:
* Striations
* Striations
* Tabular
* Tabular
==Related topics==
* [[Form]]
* ''Gemmology'' 3rd edition (2005) - Peter Read
* ''Gemmology'' 3rd edition (2005) - Peter Read

Revision as of 08:30, 22 November 2006


Imaginary crystal, prismatic with pyramidal/pedial terminations

The habit of the mineral is defined by the shape in which it will usually occur in nature. Contrary to form these are not always ideal shapes, although some might be.

When we name habits, we change the suffix of the forms that make up the habit. When the mineral has the form of an octahedron (as many diamonds have) we name the habit "octahderal".

When a mineral is made up of different forms we name the habit accordingly. In the image on the right the mineral exhibits 3 different forms (a prism, two pyramids and a pedion), we name the habit "prismatic with pyramidal and pedial terminations".

There are many different types of habit that may have their own specific names:

Botroyidal formation of malachite
  • Acicular
  • Bipyramidal
  • Botroyidal (or globular)
  • Columnar (or fibrous)
  • Dentritic
  • Dodecahedral
  • Euhedral
  • Mamillary
  • Massive
  • Octahedral
  • Prismatic
  • Scalenodedral
  • Striations
  • Tabular

Related topics


  • Gemmology 3rd edition (2005) - Peter Read