flint
(noun)
 A hard, fine-grained quartz that fractures conchoidally and generates sparks when struck.
Examples of flint in the following topics:
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Paleolithic Artifacts- Constructed using flint and bone, the stone is believed to represent the upper part of a face, while the bone has been interpreted as eyes.
 
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Paleolithic Sculpture- Constructed using flint and bone, the stone is believed to represent the upper part of a face, while the bone has been interpreted as eyes.
 
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Characteristics of Romanesque Architecture- Other areas saw extensive use of limestone, granite, and flint.