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ngangey (Geotechnical) (OP)
21 Oct 10 23:16
Based on visual inspection how can I classify the bedrock on a riverbed if it is Gabbro or Basalt?
cvg (Civil/Environmental)
22 Oct 10 12:52
color and grain size?
fattdad (Geotechnical)
22 Oct 10 19:06
Gabbro is coarser grained - almost like granite.  Basalt is uniformly dark gray or black and fine grained.  Here's a chart on igneous rocks:



f-d

¡papá gordo ain't no madre flaca!

cvg (Civil/Environmental)
22 Oct 10 19:20
basalt gray or black
gabro more green  
ngangey (Geotechnical) (OP)
22 Oct 10 19:54
fattdad your the best..Thank you for the information..
BigH (Geotechnical)
23 Oct 10 19:27
fattdad - where did you access the chart?
fattdad (Geotechnical)
23 Oct 10 21:32
Here's the web page that hosts the image.

http://geology.csupomona.edu/alert/igneous/igclass.htm

f-d

¡papá gordo ain't no madre flaca!

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