pigeonite


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pigeonite

(ˈpɪdʒɪˌnaɪt)
n
(Geological Science) mineralogy a brownish mineral that is a silicate of magnesium, ferrous iron, and calcium
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References in periodicals archive ?
According to the X-ray diffraction analysis presented in Figure 4, a spondyle clay consists of two minerals such as augite (card number 01-088-0831) and pigeonite (card number 01-087-0693).
The orthopyroxene commonly shows good crystal outlines but can be corroded, with interior holes or ragged edges, and rims of magnetite and/ or small grains of pigeonite. Clumps or clusters of mediumto coarse-grained augite are also common, typically with coarse plagioclase laths in a glomeroporphyritic texture.
Overlying the banded ironstone is a coarse-grained, black pegmatoid consisting of augite and inverted pigeonite with minor plagioclase and olivine.
low-K tholeiite olivine clinopyroxene plgeonlte orthopyroxene amphibole biotite magnetite plagioclase alkali feldspar quartz medium-K calc alkaline olivine clinopyroxene plgeonlte orthopyroxene amphibole biotite magnetite plagioclase alkali feldspar quartz high-K calc alkaline olivine clinopyroxene pigeonite orthopyroxene amphibole biotite magnetite plagioclase alkali feldspar quartz Table 2.