Home Mineralia Specimens   Sitio en Español English Site

Crystal System

Crystal system can be defined as the array and number of faces that a mineral tends to form on their crystal's surface in a determinate symmetry; this factor affects other mineral’s characteristics like form, habit, cleavage, luster, hardness and color. Depending on the symmetry in the array of the faces we can find seven types of crystal systems:

Isometric

Diploidal (Pyrite)

PyriteLuis Lyons photo
Hexoctaedral (Native Copper)
Native CopperLuis Lyons photo

Hextetraedral (Sodalite)

SodaliteLuis Lyons photo
   
Tetragonal

Dipiramidal (Wulfenite)

WulfeniteLuis Lyons photo

Ditetragonal (Zircon)

ZirconLuis Lyons photo

Escalenohedrical: (Chalcopyrite)

ChalcopyriteLuis Lyons photo
   
Orthorhombic

Dipiramidal: (Adamite)

Adamite

Luis Lyons photo
   
Hexagonal

Dihexagonal - Dipiramidal (Beryl)

Beryl

Luis Lyons photo

Dipiramidal (Mimetite)

MimetiteLuis Lyons photo
   
Trigonal

Ditrigonal (Turmaline)

TurmalineLuis Lyons photo

Hexagonal - escalenoedrical (Rhodochrosite)

RhodochrositeLuis Lyons photo

Trapezoedrical (Quartz)

QuartzLuis Lyons photo
   
Monoclinic

Prismatic (Gypsum)

GypsumLuis Lyons photo
   
Triclínic

Pinacoidal (Labradorite)

LabradoriteLuis Lyons photo
   
Amorphous

There's other type called amorphous which is applied to crystals with no symmetry, this means that crystal system is absent, Amber and Opal are a good example.

AmberLuis Lyons photo