corundum
31oriental ruby — Corundum Co*run dum (k[ o]*r[u^]n d[u^]m), n.; pl. {Corundums} (k[ o]*r[u^]n d[u^]mz). [Also corindon.] [From Hind. kurand corundum stone.] (Min.) The mineral alumina ({Al2O3}), as found native in a crystalline state. Transparent varieties are… …
32sapphire — Corundum Co*run dum (k[ o]*r[u^]n d[u^]m), n.; pl. {Corundums} (k[ o]*r[u^]n d[u^]mz). [Also corindon.] [From Hind. kurand corundum stone.] (Min.) The mineral alumina ({Al2O3}), as found native in a crystalline state. Transparent varieties are… …
33Sapphire — For other uses, see Sapphire (disambiguation). Sapphire The 423 carat (85 g) blue Logan sapphire General Category Oxide mineral …
34Aluminium oxide — Alumina redirects here. For the company, see Alumina Limited. This article is about aluminium(III) oxide Al2O3. For other uses, see Aluminium oxide (disambiguation). Aluminium oxide …
35Birthstones — ▪ Table Birthstones month traditional gemstone 20th century expansion synthetic supplement: trade name material of synthetic stone January garnet garnet dark red synthetic corundum February amethyst amethyst purple synthetic corundum March… …
36Ruby — This article is about the mineral. For other uses, see Ruby (disambiguation). Ruby Natural ruby crystals from Winza, Tanzania General Category …
37Litchfieldite — is a rare metamorphosed igneous rock. It is a variety of nepheline syenite and is composed of two near pure phases of feldspar, albite and microcline, with predominance of the first one, plus nepheline, sodalite, cancrinite and calcite. The mafic …
38Korund — Chemische Formel Al2O3 Mineralklasse Oxide und Hydroxide 4.CB.05 (8. Auflage: IV/C.4 10) (nach Strunz) 04.03.01.01 (nach Dana) …
39Gemstone — Jewels redirects here. For other uses, see Jewels (disambiguation). Precious Stone redirects here. For the James Bond character, see Hurricane Gold. For other uses, see Gemstone (disambiguation). A selection of gemstone pebbles made by tumbling… …
40Chrysoberyl — General Category Oxide minerals Spinel group Chemical formula Be …
