Photomicrograph Gallery

Built by Giles Droop

Optical Properties:

• Relief
• Colour and Pleochroism
• Cleavage
• Shape
• Interference Colours
• Extinction
• Twinning
• Exsolution
• Zoning
• Alteration
• Artefacts

Common Minerals of Igneous Rocks:

• Olivine
• Augite
• Orthopyroxene
• Hornblende
• Biotite
• Muscovite
• Plagioclase
• Alkali Feldspar
• Quartz
• Zircon
• Sphene
• Apatite
• Volcanic Glass (note: not actually a mineral)

Igneous Textures:

• Crystallinity and crystal form
• Relationships between crystal grains
• Bulk igneous rock textures