What is Quartzite?
Pure Quartzite is White or Grey
Whilst most rocks are made up of several different minerals some are made up of just one. Quartzite which is composed almost entirely of quartz formed through the metamorphism of sandstone. Sandstone is a common sedimentary rock made-up from minute grains of quartz.
In its purest form quartzite is usually white or grey. Impurities of iron cause various shades of pink or red. Inclusions of chromium rich mica changes the colour to green. The green stone is better known as green aventurine. Different colours present in quartzite are caused by different mineral inclusions.
Quartzite is an extremely hard stone that's resistant to chemical weathering. It can sometimes resemble marble which formed through the metamorphism of limestone. Marble is softer than quartzite.
The reason quartzite is so tough and durable is because of its tightly interlocking grains of quartz.
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