| Answer | Crossword Clue |
|---|---|
| sagenites | variety of rutile occurring as needlelike crystals embedded in quartz |
| polianite | manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz |
| polianites | POLIANITE, manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz |
| sphenes | mineral, calcium titanium silicate, CaTiSiO5, occurring as an accessory mineral in a variety of crystalline rocks, usually in small wedge-shaped crystals |
| titanite | mineral, calcium titanium silicate, CaTiSiO5, occurring as an accessory mineral in a variety of crystalline rocks, usually in small wedge-shaped crystals |
| sphene | mineral, calcium titanium silicate, CaTiSiO5, occurring as an accessory mineral in a variety of crystalline rocks, usually in small wedge-shaped crystals |
