A Glass Fact:
Other than its artificial form glass is found in nature as either
obsidian or rock crystal. Obsidian, a dark vitreous lava material was known and
used as the tip of spears or arrows in Anatolia, Mexico and South America
thousands of years ago. Rock crystal which is a sort of natural quartz is
almost colorless and semi-transparent. It was also used by some ancient
civilizations. Some of the earliest evidences of the use of this natural
material by natives are found at Troia (Anatolia) in the form of the head
of a lion statue from the late 3rd millenium BC and also 14th century BC
Hittite statues, also found in Anatolia.
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