Editing Northumbrian rocks and landscape: a field guide

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'''amygdale '''Cavity within a lava, '''''dyke '''''or '''''sill, '''''lined or filled with secondary minerals.
 
'''amygdale '''Cavity within a lava, '''''dyke '''''or '''''sill, '''''lined or filled with secondary minerals.
  
'''andesite '''Fine-grained volcanic rock of intermediate composition (with about 53–60% silica).
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'''andesite '''Fine-grained volcanic rock of intermediate composition (with about 53-60% silica).
  
 
'''anhydrite '''CaSO<sub>4</sub> White to grey, rock-forming '''''evaporite '''''mineral.  
 
'''anhydrite '''CaSO<sub>4</sub> White to grey, rock-forming '''''evaporite '''''mineral.  
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'''arenite '''Sedimentary rock of sand-grade with <15% mud matrix (hence '''arenaceous).'''
 
'''arenite '''Sedimentary rock of sand-grade with <15% mud matrix (hence '''arenaceous).'''
  
'''argillaceous '''Silt to clay grade sediments (grains <0.0625&nbsp;mm diameter).
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'''argillaceous '''Silt to clay grade sediments (grains <0.0625 mm diameter).
  
 
'''arkose '''Sand-grade rock containing 25% or more '''''feldspar. '''''
 
'''arkose '''Sand-grade rock containing 25% or more '''''feldspar. '''''
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'''baryte/barytes '''BaSO<sub>4</sub>''' Baryte '''is a colourless to white mineral, commonly in tabular crystals, noticeably heavy. A common '''''gangue '''''mineral. '''Barytes '''is the commercial product.
 
'''baryte/barytes '''BaSO<sub>4</sub>''' Baryte '''is a colourless to white mineral, commonly in tabular crystals, noticeably heavy. A common '''''gangue '''''mineral. '''Barytes '''is the commercial product.
  
'''basalt '''Dark, often almost black, fine-grained basic volcanic rock, low in silica (no '''''quartz''''') and relatively rich in iron, magnesium and calcium.  
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'''basalt '''Dark, often almost black, fine-grained basic volcanic rock, low in silica (no '''''quartz) '''''and relatively rich in iron, magnesium and calcium.  
  
 
'''bioclast '''A shell or skeletal fragment.
 
'''bioclast '''A shell or skeletal fragment.

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