2016-10-17
Topaz:

Topaz is a silicate mineral of aluminium and fluorine.
The name "topaz" is usually derived from the Greek Τοπάζιος...

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2016-10-12
Agate:

Agate /ˈæɡət/ is a cryptocrystalline variety of silica, chiefly chalcedony, characterized by its fineness of grain and brightness of color. Although agates may be found in various kinds of...

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