| QUARTZ | Hard mineral such as amethyst or citrine, say (6) |
| CRYSTALS | General name for minerals such as amethyst, turquoise or rose quartz (8) |
| ZIRCON | Tetragonal mineral such as jacinth or jargoon (6) |
| SILICA | Mineral such as quartz (6) |
| CRYSTAL | Used in holistic healing therapies and yoga, general word for a mineral or gemstone such as amethyst, aventurine, citrine, rose quartz or turquoise (7) |
| HUMBER | Hard mineral in estuary (6) |
| YELLOW | Name, related to "gold" and "yolk" and once synonymous with "jealous", of the colour of a brimstone butterfly, buttercup, celandine, citrine quartz gem, corn on the cob, cowslip, jonquil, lemon, sulph |
| SPINEL | A hard mineral |
| ORE | Rock from which a valuable metal or mineral, such as diamond or gold, can be extracted profitably; or, a poetic word for a precious metal (3) |
| SEMIPRECIOUS | Classification of stones such as amethyst, garnet, and jade (12) |
| ASBESTOS | Fibrous mineral, such as chrysotile or tremolite, that is incombustible (8) |
| FOOLSGOLD | Yellow mineral such as pyrite or chalcopyrite |
| BERYL | Mineral such as the blue variety aquamarine or the green emerald (5) |
| PRECIOUSMETAL | Mineral such as gold or platinum with a high economic value (8,5) |
| SILICATE | Mineral such as mica or garnet (8) |
| TOPAZ | From "yellow sapphire", a typically clear or yellowish-brown gem; citrine; an amber or golden colour; an orange-tangerine hybrid; or, a hummingbird, such as the "fiery" or "ruby" species (5) |
| RAREEARTH | Mineral such as yttrium |
| AEROLITE | Stony meteorite, typically consisting of silicate minerals such as olivine, pyroxene etc. (8) |
| ORES | Minerals such as cinnabar |
| ARSENIC | Toxic metalloid element of the nitrogen group occurring in minerals such as orpiment and realgar (7) |
