By Jeremy Ingham
The 1st complete advisor to the petrography of geomaterials, making the petrographers professional wisdom on hand to practitioners, educators and scholars all over the world drawn to glossy and ancient development fabrics.
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Extra info for Geomaterials Under the Microscope A Colour Guide
The finely crystalline equivalent of gabbro is basalt, which occurs as lava. It has the same black appearance 33 33 ‘Crystal Black’ porphyritic dolerite (China) chiefly comprising phenocrysts of augite (pink/yellow/blue) set in a groundmass of plagioclase (labradorite composition) feldspar (grey/black), with minor olivine (green/brown); XPT, ×35. 35 35 ‘Royal Green’ dolerite (China) that exhibits alteration of ferromagnesian minerals to chlorite (green); PPT, ×35. and is used locally for masonry and hard landscaping.
Figure 44 shows a calcareous sandstone with calcite cement. This sandstone is pink in hand specimen due the presence of red iron 41 ‘Northowram’ quartzitic sandstone (Halifax, England) consisting mainly of quartz grains (grey/white/black) with traces of muscovite mica (elongated, brightly coloured) and clay minerals (brown); XPT, ×150. 42 42 Nubian sandstone (Egypt) consisting of quartz grains (white) and clay minerals (brown). Macropores are shown (yellow); PPT, ×35. 43 43 ‘Blue Pennant’ sandstone (Wales) consisting of quartz grains (grey/black) with a matrix of clay minerals (bright) and carbonaceous matter (brown); XPT, ×150.
Mineral concentrations not protruding 107 A slate from Argentina with a quartz vein (grey); XPT, ×35. 108 108 A chlorite vein (blue) in ‘Castilla’ slate (Spain); XPT, ×150. 109 109 Spanish slate that has failed along a vein filled by calcite (brown) and pyrite (black); XPT, ×35. 55 56 Roofing slate from the surface may be referred to as inclusions. The inclusions may be dispersed or concentrated in bands along the grain. Common mineral inclusions include quartz, carbonates, and iron sulfides, and different minerals may occur together (110).
Geomaterials Under the Microscope A Colour Guide by Jeremy Ingham