476 REPORT OF NATIONAL MUSEUM, 1900. 



II. Description of minerals used as gems — Continued. Page. 



Damourite 500 



Datolite 500 



Diamond 500 



Diaspore 506 



Diopside 506 



Dioptase — ^Vchirite — Congo emerald 506 



Dumortierite 507 



Enstatite — Bronzite — Hypersthene 507 



Epidote— Thulite 508 



Euclase 508 



Fluorite — Chlorophane 508 



Gadolinite 509 



Garnet 509 



Gothite 511 



Gold 511 



Gypsmn: 



Alabaster — Satin-spar — Selenite 511 



Hematite — Chromic iron — Ilmenite * 512 



Hornblende 512 



lolite: 



Dichroite — Saphir d'eau — Water sapphire 512 



Ilvaite 513 



Isopyre 513 



Jade 513 



Kyanite — Disthene 513 



Labradorite 514 



Lapis-Lazuli 514 



Lepidolite , 515 



Magnetite — Lodestone 515 



Microcline — Amazonstone — Aventurine 515 



Microlite 515 



Natrolite 516 



Obsidian 516 



Olivine : 



Chrysolite — Peridot — Hyalosiderite 516 



Octahedrite — Anatase 517 



Odontolite — Bone turquoise — Fossil turquoise 517 



Oligoclase — Heliolite— Sunstone 517 



Opal 517 



Orthoclase: 



Adularia — Aventurine — Moonstone — Perthite 518 



Pegmatite — Graphic granite 519 



Phenacite 519 



Porphyry 519 



Prehnite — Chlorastrolite — Zonochlorite 520 



Pyrite and marcasite 520 



Quartz 520 



Rhodonite — Fo wlerite 526 



Rutile— Nigrine 526 



Samarskite 526 



Scapolite — Wernerite — Wilsonite 526 



Serpentine 527 



Smithsonite * 527 



