| He looked down and was relieved to see a faint reflection off a surface--not the dirt and rock of the tunnel, but a floor; smooth and dark like polished mica. [2, p. 154] |
Mica is a type of rock made up of hydrous silicates of aluminum, and it is usually translucent. It is also known as isinglass. Just think of Superman's Fortress of Solitude.
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