Optical Mineralogy - Crystal Systems
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12 Terms
Isometric
Means equal measure, refers to the equal crystal axes
How many crystal axes do isometric crystals have, and what angles do they meet at?
Three axes that meet at 90 degrees in the center
Hexagonal crystal subgroups
Hexagonal and trigonal
Axes of Hexagonal crystals
Three horizontal axes at angles of 120 degrees, and one perpendicular c-axes through the middle
Tetragonal crystal axes
Two equal horizontal axes that are perpendicular to each other, one c-axis.
Which two crystal systems are uniaxial
Hexagonal and tetragonal
Orthorhombic crystal axes
3 mutually perpendicular axies of diffrent lengths
Monoclynic crystal axes
Axes of unequal length, where a & b are perpendicular, b & c are perpendicular, but a & c are not
Triclinic crystal system
Three axes, none are equal or perpendicular
Triclinic system symmetry
They have one plane, or none
Examples of isometric crystals
Fluorite, halite, garnet, magnetite, pyrite, sylvite
Tetragonal crystal example
beryl, rutile, zircon
Note 
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