Mineral Species: Quartz variety (Chalcedony)
Chemical Formula: SiO2
Mohs Scale Hardness: 6.5 - 7
Location: Worldwide
Typical Appearance: Agates can come in a variety of colours. Usually translucent. Most brightly coloured agates are dyed.
Agate comes in a wide range of varieties.
- Agatised Wood - Petrified wood
- Black Agate - Most are usually dyed black
- Blue Agate - Vivid darker blue colour. Most are usually dyed blue
- Blue Lace Agate - Light blue colour with light bands
- Blue Storm Agate - Light blue colour with patches of white which looks similar to clouds
- Brecciated Agate - Agate with broken fragments naturally cemented together
- Botswana Agate - Banded agate. Named after where it is mined in Africa
- Crazy Lace Agate - Agate with swirling and twisting bands of various colours
- Dendritic Agate - Translucent agate with fern-like inclusions
- Eye Agate - Agate with perfectly shaped concentric rings
- Fire Agate - Iridescent agate with fire red colours similar to opal
- Fossil Agate - Organic material replaced by agate
- Green Agate - Most are usually dyed
- Moss Agate - Inclusions that resembles moss
- Onyx - Type of chalcedony, usually a solid dark colour with banding
- Pink Agate - Most are usually dyed
- Purple Agate - Most are usually dyed
- Sardonyx - Brown to red colouring with usually white banding
- Thunder Egg - Rounded nodule filled with Agate
- Turritella Agate - Agate with shell fossils.