Rubino-di-rocca=red garnet having a tinge of violet.
Ruby spinel=deep-red spinel.
Ruin aragonite=brecciated Mexican onyx (aragonite).
Rutile=oxide of titanium.
Sabalite=yellowish to greenish banded phosphatic material, similar to or inclosing variscite, from Utah. Sacred turquoise=pa!e-blue smithsonite. Sagenite=transparent quartz with inclusions of hairlike or needle-like crystals
or fibers of some other mineral, generally rutile. Samarskite=black mineral of complex composition, essentially a columbate of
yttrium, uranium, and iron. Sandy sard=sard dotted with darker spots (quartz). Saphir d'eau=\vater sapphire (blue cordierite). Sappar6=transparent kyanite. Sapphire=blue corundum. The name is also applied to colorless and colored
(except red) corundum. Sapphire quartz=blue quartz. Sapphirine=blue chalcedony, blue quartz ; also blue spinel; silicate of aluminum
and magnesium. Sard=chalcedony of a rich brown color, with a reddish tint; brownish-red
or dark-brown carnelian (sardoine). Sardoine=brownish-red or dark-brown carnelian. Sardonyx (sard-onyx) = white and brown banded chalcedony. Satelite=serpentine cat's-eye. Satin spar=finely fibrous gypsum having a pearly opalescence; also finely
fibrous calcite having a silky luster; also finely fibrous aragonite having
a silky luster. Saussurite=greenisb to white or gray rock composed chiefly of zoisite. Saxon chrysoIite=pale wine-yellow or greenish-yellow topaz tinged with green. Saxon topaz=pale wine-yellow topaz; also citrine (quartz). Scapolite=group of minerals composed of silicates of aluminum, calcium, and
sodium, with the chloride, carbonate, or sulphate radicles. Scarab=precious stone inscribed with symbols, engraved like a beetle. Schaumburg diamond=quartz crystal from Schaumberg, Hesse, Germany. Schiller quartz=quartz cat's-eye. Schiller spar=bastite (enstatite). Schnecken topaz—Saxon topaz. Schorl=bIack tourmaline.
Schorlomite=blaek garnet containing considerable titanium. Scotch topaz=smoky quartz. Selenite=colorles, transparent gypsum. Semicarnelian=yellow agate.
Semiopal=colorless to strongly colored somewhat opaque, common opal. Semiturquoise=soft pale-blue turquoise. Sepiolite=hydrous silicate of magnesium. Serpentine=hydrous silicate of magnesium. Serpentine cat's-eye=serpentine showing when cut a changeable luster or
opalescence without play of colors. Siam=dark-red ruby.
Sixim ruby=dark-red ruby from Siam; also red spinel. Siberian amethyst=rich or dark-colored amethyst. Siberian aquamarine=very light greenish-blue beryl. Siberian chrysolite=demantoid (garnet). Siberian rtfoy=red tourmaline.
Siberian topaz=very pale blue or bluish-white topaz. Siberite=violet-red tourmaline.
Siderite=sappharine (blue quartz). Mineralogically. a carbonate of iron. Siliceous malachite=green chrysocolla.
Silicified wood=wood replaced by silica and small amounts of iron compounds. Sinople=quartz having red hematite inclusions. Slave's diamond=colorless topaz. Smaragdite=green variety of amphibole, like actinolite; also applied to other
green stones, as the emerald, fuchsite, etc.