OPAL - the rainbow of the desert

GLOSSARY

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

F

Flint
nodular, greyish form of chalcedony, often occurring in chalk beds

Form
in mineralogy, the shape of a crystal