from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A red, yellow, or brown mineral, essentially HFeO2, one of the common constituents of rust.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An iron oxyhydroxide that is the main constituent of rust
from the GNU version of the Collaborative International Dictionary of English
- n. an oxide of iron.
from The Century Dictionary and Cyclopedia
- n. A hydrous oxid of iron, occurring in orthorhombic crystals, also massive. It is found with other ores of iron, for example hematite or limonite, as at the Lake Superior mines.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a red or yellow or brown mineral; an oxide of iron that is a common constituent of rust
He was fascinated by minerals and early mineralogy (the mineral goethite is named for him).
The experiments, reported in the European journal Water Research, used a mineral called goethite, an iron-bearing oxide that is abundant on the ocean floor.
Low goethite: Mineralogical studies of the bauxite suggest that abundances of the problematic iron hydroxide mineral species called goethite are very low to absent.
The experiments, reported in the European journal Water Research, used a mineral called goethite, an iron-bearing oxide that is abundant on the ocean floor. here to register.
On heating the goethite released CO2 with distinctive isotope signatures.
With respect to minerals I remember that Yapp and co-workers had carried out some interesting experiments on goethite an iron hydroxide mineral that is formed as a weathering product.
Natural pigments such as yellow goethite and red hematite, both iron oxides, and black charcoal and manganese dioxide were used to create the extraordinary 30,000-year-old images of mammoths, bison, horses, and deer in Chauvet Cave in southern France.
This gave the artists a range of shades in the yellow-red part of the spectrum in delicate gradations lacking in the natural goethite and hematite pigments.
"A well-known property of goethite is that it dehydrates and transforms to hematite when heated to 250-300°C, with a corresponding color change," the team stated in the journal Archaeometry.
"As early as the Roman period painters used goethite as the basis for recipes to obtain red pigment and hues ranging from yellow and orange to deep purple, a process practiced well into the twentieth century."