Forensic Micro: Crystallography

how many refractive indices does a cubic system have?

1

how many refractive indices does a uniaxial system have?

2

how many refractive indices does a biaxial system have?

3

is the tetragonal system cubic, uniaxial, or biaxial?

uniaxial

is the hexagonal system cubic, uniaxial, or biaxial?

uniaxial

is the orthorhombic system cubic, uniaxial, or biaxial?

biaxial

is the monoclinic system cubic, uniaxial, or biaxial?

biaxial

is the triclinic system cubic, uniaxial, or biaxial?

biaxial

which system is isotropic?

cubic

what type of extinction does the tetragonal system have?

symmetry/parallel

what type of extinction does the hexagonal system have?

symmetry/parallel

what type of extinction does the orthorhombic system have?

symmetry/parallel

what type of extinction does the monoclinic system have?

one view with oblique extinction

what type of extinction does the triclinic system have?

all views with oblique extinction