Editing Yorkshire rocks and landscape: a field guide

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'''cinnabar '''HgS Most common mineral of mercury, scarlet to brownish red.
 
'''cinnabar '''HgS Most common mineral of mercury, scarlet to brownish red.
  
'''clast '''Rock fragment; hence '''clastic rock. '''The principal clastic rocks are distinguished on grain size thus: '''conglomerate '''>2 mm > sandstone > 0.0625 mm > siltstones >0.004 mm> mudstone/shale.
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'''clast '''Rock fragment; hence '''clastic rock. '''The principal clastic rocks are distinguished on grain size thus: '''conglomerate '''>2 mm > sandstone > 0.0625 mm > siltstones >0.004 mm> mudstone/shale.
  
'''Clast fabric '''(imbrication) may indicate direction of water flow where platy/tabular casts lean in the direction of the current.
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'''Clast fabric '''(imbrication) may indicate direction ofwater flow where platy/tabular casts lean in the direction of the current.
  
'''cleavage '''A close-spaced, regular fracture or fabric imposed on strongly-'''folded''' beds and best developed in weaker, fine-grained rocks.
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'''cleavage '''A close-spaced, regular fracture or fabric imposed on strongly-folded beds and best developed in weaker, fine-grained rocks.
  
'''coccolith '''Minute calcium carbonate plate or disc, usually less than 0.02 mm in diameter, part of the covering of a microscopic marine, planktonic, unicellular alga. Coccolith ooze is a major component of '''chalk.'''
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'''coccolith '''Minute calcium carbonate plate or disc, usually less than 0.02 mm in diameter, part of the covering of a microscopic marine, planktonic, unicellular alga. Coccolith ooze is a major component of '''chalk.'''
  
'''cone-in-cone '''Fabric of adjacent sets of vertically nested cones, each about 3&nbsp;cm or more in diameter, caused by precipitation of CaCO<sub>3</sub> under pressure in a mud-grade rock.
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'''cone-in-cone '''Fabric of adjacent sets of vertically nested cones, each about 3 cm or more in diameter, caused by precipitation of CaCO<sub>3</sub> under pressure in a mud-grade rock.
  
 
'''concretion '''Spherical or ellipsoidal, resistant mass formed by local early cementation of the sediment.
 
'''concretion '''Spherical or ellipsoidal, resistant mass formed by local early cementation of the sediment.

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