Geoscience Reference
In-Depth Information
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Chalcedony (fibrous silica) within a flint
aggregate particle; XPT, ×150.
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Greywacke coarse aggregate particle. Quartz
grains appear white and the matrix appears brown;
PPT, ×35.
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Silicified limestone with microcrystalline silica
appearing grey and calcite shown pink/brown; XPT,
×300.
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Granite coarse aggregate particle consisting of
coarsely crystalline quartz (grey, left), feldspar (grey,
right), and biotite mica (brown); XPT, ×35.
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Microgranite coarse aggregate particle consisting
of finely crystalline quartz (grey/white/black), feldspar
(grey), muscovite mica (yellow/pink/blue), and biotite
mica (brown/green); XPT, ×35.
