| LAPISLAZULI | A brilliant blue variety of a rare mineral, used as a gemstone (5,6) |
| THORITE | A rare mineral resembling zircon (7) |
| LAPIS | Brilliant blue variety of the mineral lazurite (5,6) |
| LAZULI | Brilliant blue variety of the mineral lazurite (5,6) |
| ULTRAMARINE | A brilliant blue pigment originally obtained from lapis lazuli (11) |
| CHRYSOBERYL | Rare greenish-yellow mineral used as a gemstone (11) |
| SAPPHIRE | Clear, hard, usually blue variety of corundum used as a gemstone (8) |
| AQUAMARINE | Pale greenish-blue variety of beryl used as a gemstone (10) |
| BLUEJOHN | A purple-blue variety of fluorite occurring only in Derbyshire (4,4) |
| SARD | Banks of river littered with blue variety of chalcedony (4) |
| COBALT | Which metallic element yields a brilliant blue pigment? (6) |
| HEN | Some soldiers from Delaware supposedly took a blue variety of this along when they fought in the American Revolution |
| GARNET | Any of a group of hard, glassy red, yellow or green minerals used as a gemstone or abrasive (6) |
| OPAL | Mineral used as a gemstone, of hydrated silica (4) |
| TOPAZ | A white or colourless mineral used as a gemstone (5) |
| DANISH | - blue; variety of cheese (6) |
| YTTRIA | Oxide of a rare-earth element, a yellowish-white powder (6) |
| TYRE | Ancient Phoenician port in southern Lebanon known for the production of a rare sort of purple dye |
| TURQUOISE | Greenish-blue mineral used as a gemstone (9) |
| STRAIN | A muscle injury; a melody; a particular variety of a microbe etc; or, intense mental or physical effort (6) |
