Showing posts with label Agate. Show all posts
Showing posts with label Agate. Show all posts
Monday 5 November 2012
Sunday 29 April 2012
Article - Gemstones - Agate
Agate
This gemstone has been prized since antiquity and is a variety of Chalcedony, which in turn is a member of the Quartz family.
It was given its name by Theophrastus, a Greek philosopher who is believed to have discovered the gem on the banks of the river Achates in the 4th century BC. The gemstone was later mentioned in the Bible as one of the “stones of fire”.
Made from silicon dioxide, it has a glassy (vitreous) lustre, and registers 7 in hardness on the Mohs scale. Being such a hard stone, Agate is often used to make brooches and pins. Additionally, as it can also resist acids (unlike a lot of other gemstones) it has been used to make mortars and pestles to ...
This gemstone has been prized since antiquity and is a variety of Chalcedony, which in turn is a member of the Quartz family.
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| Agate Jewellery |
Made from silicon dioxide, it has a glassy (vitreous) lustre, and registers 7 in hardness on the Mohs scale. Being such a hard stone, Agate is often used to make brooches and pins. Additionally, as it can also resist acids (unlike a lot of other gemstones) it has been used to make mortars and pestles to ...
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