Space Shuttle Columbia - Flown HRSI Tile Fragment air-and-space Some have been cleaned while

Some have been cleaned while others still have the patina of many years on their surface

Teeth may also show marks of life wear and indentations common with concretions built up over millions of years

This specimen

twice the size of the specimen in the Fourth Edition)

Space Shuttle Columbia - Flown HRSI Tile Fragment air-and-space Some have been cleaned whileThis specimen is a fragment of the black, reaction cured glass coating of the HRSI Space Shuttle Tile which appears in the Fourth Edition of the Mini Museum. NASA disposition paperwork accompanying the tile indicates it was removed after the Space Shuttle Columbias 7th mission, STS 61 C, which flew on January 12, 1986. As pictured, the item is roughly the size of a standard Mini Museum specimen (4 5mm). The glass coating is very thin, so for