Agate

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.