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Goethite (/ˈɡɜːrtaɪt/, US also /ˈɡoʊθaɪt/) is a
mineral of the
diaspore group,
consisting of iron(III) oxide-hydroxide,
specifically the α-polymorph. It...
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within the
matrix that
control goethite crystal size and shape.
Because of this, the main
factor influencing goethite crystal growth is the
chitin fibers...
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different minerals (polymorphs)
denoted by the Gr****
letters α, β, γ and δ.
Goethite, α-FeO(OH), has been used as an
ochre pigment since prehistoric times....
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green or blue sheen.
Oranges and
browns are
attributed to
hematite or
goethite.
Because aventurine is a rock, its
physical properties vary: its specific...
- β-Fe2O3: beta
phase γ-Fe2O3:
gamma phase,
maghemite ε-Fe2O3:
epsilon phase goethite (α-FeOOH), akaganéite (β-FeOOH),
lepidocrocite (γ-FeOOH),
feroxyhyte (δ-FeOOH)...
- brown" is
composed of a
mixture of kaolin, quartz,
goethite, and hematite, with the
hematite and
goethite (generally 60% of the content)
determining the colour...
- drab
colored ferric hydroxides.
These ferric hydroxides commonly include goethite (FeO-OH) and so-called "amorphous
ferric hydroxide" or limonite. Much of...
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processes in soil, and
along with
other iron
oxides or
oxyhydroxides such as
goethite,
which is
responsible for the red
color of many tropical, ancient, or otherwise...
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oxides are
limonite (which in its
natural state has a
yellowish color), and
goethite. In
addition to iron oxides,
natural or raw
sienna is also
composed of...
- the form of
magnetite (Fe 3O 4, 72.4% Fe),
hematite (Fe 2O 3, 69.9% Fe),
goethite (FeO(OH), 62.9% Fe),
limonite (FeO(OH)·n(H2O), 55% Fe) or
siderite (FeCO3...