Editing Northumbrian rocks and landscape: a field guide

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'''pyrrhotite '''(magnetic pyrites) FeS Bronze-yellow, reddish-brown weathering, usually massive or granular mineral; magnetic.
 
'''pyrrhotite '''(magnetic pyrites) FeS Bronze-yellow, reddish-brown weathering, usually massive or granular mineral; magnetic.
  
'''quartz '''SiO<sub>2</sub> Very common mineral, usually transparent or white but may be variously coloured. Occurs in many '''''igneous '''''and '''''metamorphic''''' rocks, is the main constituent of sandstones and siltstones and a common '''''gangue '''''mineral in '''''veins''''' when prismatic crystals with a six-faced pyramidal termination may be found.
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'''quartz '''SiO<sub>2</sub> Very common mineral, usually transparent or white but may be variously coloured. Occurs in many '''''igneous '''''and '''''metamorphic''''' rocks, is the main constituent of sandstones and siltstones and a common '''''gangue '''''mineral in '''''veins'''''when prismatic crystals with a six-faced pyramidal termination may be found.
  
 
'''regression '''Withdrawal of the sea from the land area due to a relative fall in sea level.
 
'''regression '''Withdrawal of the sea from the land area due to a relative fall in sea level.
  
'''rhyolite '''Fine-grained acid '''''igneous '''''extrusive rock; volcanic equivalent of granite.
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'''rhyolite '''Fine-grained acid ''igneous ''extrusive rock; volcanic equivalent ofgranite.
  
'''rock-salt '''See '''''halite.'''''
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'''rock-salt '''''See halite.''
  
'''schist '''A metamorphic rock with a strong, platy fabric, caused by the parallel alignment of '''''micas.'''''
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'''schist '''A metamorphic rock with a strong, platy fabric, caused by the parallel alignment of ''micas.''
  
 
'''seafloor spreading '''Process whereby volcanic activity at mid-ocean ridges causes igneous rock material to be accreted to '''plate '''margins resulting in the growth of oceanic crust.
 
'''seafloor spreading '''Process whereby volcanic activity at mid-ocean ridges causes igneous rock material to be accreted to '''plate '''margins resulting in the growth of oceanic crust.
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'''seatearth '''A fossil soil with root traces found immediately below a coal seam. A '''fireclay '''is a pure clay seatearth, whilst a '''ganister '''is a pure quartz sand seatearth.
 
'''seatearth '''A fossil soil with root traces found immediately below a coal seam. A '''fireclay '''is a pure clay seatearth, whilst a '''ganister '''is a pure quartz sand seatearth.
  
'''septarian '''Nodules or '''''concretions '''''with a series of internal mineral-filled (usually '''''calcite''''') cracks. Results from the formation of a hardened exterior shell before desiccation and shrinkage of the material inside the nodule.
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'''septarian '''Nodules or ''concretions ''with a series of internal mineral-filled (usually ''calcite) ''cracks. Results from the formation of a hardened exterior shell before desiccation and shrinkage of the material inside the nodule.
  
'''serpulid '''A group of polychaete worms with calcareous tubes.  
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'''serpulid '''A group of polychaete worms with calcareous tubes. '''sheath fold '''A highly deformed fold form with a strongly curved fold axis, produced in shear zones.
 
 
'''sheath fold '''A highly deformed fold form with a strongly curved fold axis, produced in shear zones.
 
  
 
'''siderite '''FeCO<sub>3</sub> Grey to grey-brown mineral widespread in certain sedimentary rocks, particularly sedimentary ironstone deposits and Coal Measures sequences. Also common in many Pennine '''''veins.'''''
 
'''siderite '''FeCO<sub>3</sub> Grey to grey-brown mineral widespread in certain sedimentary rocks, particularly sedimentary ironstone deposits and Coal Measures sequences. Also common in many Pennine '''''veins.'''''

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