IOLITE. The iolite derives its name from the Greek ION, violet and LITHOS, a stone. Hauy named it the DICHROITE (DIO, twice, CHROA, colour). It was known also as the Cordierite, and more familiarly as the water sapphire. It is a silicate of alumina magnesia and protoxide of iron. It possesses extraordinary dichroism, the smoky blue and yellowish-grey being easily seen with the naked eye. This circumstance induced Hauy to name it DICHROITE. Viewed in two directions it presented different colours. These colours are shown to advantage in stones cut for ornament. In 1758, Sir James Hill wrote a “History of the Iolithos or Violet Stone,” a work now most difficult to obtain. The iolite is a stone of friendship and friendly help. It benefits the eyesight and is an aid to high thoughts. It was also written as yolite, iolithe. It is of about the hardness of quartz. The iolite is under the celestial Aquarius. CHAPTER XIX JACINTH—LODESTONE JACINTH: JADE: JARGOON: MATURAN DIAMOND: JASPER: THE LYDIAN STONE OF THE ANCIENTS: THE HELIOTROPE OR BLOODSTONE VARIETY: THOMAS NICOLS AND ARTIFICIAL INFUSIONS: ST. ISIDORE ON THE JASPER: LEGEND OF THE CROSS: NUMBER FIVE AND THE STONE OF THE VIRGIN: RARE WORKS IN JASPER: GALENUS ON ITS VIRTUES: THE ANODYNE NECKLACE: THE JASPER AMULET OF NECHEPSOS: THE WHEEL OF EZEKIEL: JASPER SIGILS: TRALLIANUS AND THE JASPER: MOTTLED JASPER, A CHARM TO PROTECT FROM DROWNING: ZODIACAL REFLECTIONS: THE STONE OF VICTORY: VAN HELMONT’S EXPERIMENTS: THE JASPER AMONGST THE JEWELS OF THE ROSICRUCIANS: JET: KAURI GUM: KOLOPHONITE: KUNZITE: KYANITE: LABRADORITE: LAPIS LAZULI: COLOURS AND NAMES: PERSIAN LAJWARD, ITS VIRTUES: ITS PLACE IN THE BOOK OF THE DEAD: COMMANDMENT STONES: LAPIS LAZULI IN CHINA: KATHERINE II AND HER PALACE ROOM: A STONE OF THE ALCHEMISTS: LIMONITE: LODESTONE: PLINY’S STORY OF ITS DISCOVERY: HOW TERMED BY TITUS CARUS LUCRETIUS: THE STONE OF HERCULES: LEGEND OF THE PHOENICIANS: THE AGE OF THE MARINER’S COMPASS: CONSTRUCTION OF ONE BY THE CHINESE EMPEROR HOUANGTI: PAUSANIAS AND THE STONE IMAGE OF HERCULES: A CRAMP STONE: A DIVINATORY INSTRUMENT: THE PLAN OF PTOLEMY PHILADELPHUS: PROFESSOR NOAD AND THE POWER OF THE LODESTONE: BARRETT’S “ANTIPATHIES”: STORY OF CLAUDIANUS: MAGNET AND THE ONION. JACINTH. (See HYACINTH.) JADE. See (NEPHRITE.)