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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....
- 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)...
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crystals transformed into limonite, a
compact mixture of iron
oxides where goethite generally predominates, are common. In some cases, only
partial replacement...
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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...
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Sphalerite 4 Iron 4–4.5
Ordinary steel 4.5
Colemanite 5
Apatite 5-5.5
Goethite 5.5 Gl**** 5.5–6 Opal 6
Rhodium 6-6.5
Rutile 6.5
Silicon 6.5–7
Jadeite 7...
- 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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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...
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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...
