Identifier: scienceguide1630amer (find matches)
Title: Guide leaflet
Year: 1901 (1900s)
Authors: American Museum of Natural History
Subjects: American Museum of Natural History Natural history
Publisher: New York : The Museum
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: IMLS / LSTA / METRO

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WIDMANSTATTEN LINES, OR FIGURES. Carleton Iron Meteorite. Natural size. In this iron the plates are very thin. origin is extremely rare and has been found almost exclusively at DiscoIsland and immediate vicinity on the west coast of Greenland. TheDisco, or Ovifak, iron contains less nickel than meteoritic iron, whileother terrestrial nickel-irons (i. e. awaruite and josephinite) containmuch more. Small quantities of metallic cobalt are also alloyed withthe nickel and a little copper is sometimes found in the same association.Next to nickel-iron the mineral olivine, or chrysolite, is the mostimportant constituent. This is a silicate of magnesium, always con-
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2 .g i 5 a •/. 2 -^ 1 o I _^ oo z ~z o ♦3 h _ U ,5 111 V) *Q a ~ ui 2 i •ji u h Ul /. ** c ~Z _j CQ z ^ z HOVEY, THE FOYER METEORITES 17 taining some iron, which occurs iii all the siderolites and most of theaerolites, sometimes comprising a considerable portion of their mass.It Is a dark yellowish-green to black, glassy mineral usually occurring asrounded or angular grains, hut sometimes as crystals. It is prominent in a slice of Brenham in the Foyer collection, where it forms glassygrains in a mesh of nickel-iron. Olivine is the gem, peridot. The minerals belonging to the group known as orthorhombic py-roxenes are next to olivine in point of abundance1. Chemical analysesshow that all gradations are present from the colorless enstatite to thealmost black hypersthene members of the group. The monoclinicpyroxenes, which are important constituents of terrestrial igneous rocks,are represented in meteorites by only two forms, an iron-alumina pyrox-ene like common

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