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Oplopanax
Mountain climber
The Deep Woods
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Mar 19, 2019 - 03:06pm PT
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Next, veer left and alternate side-pulls up the 1" wide marble dike- its too steep to pull straight up!
That's not marble. Also looks like aplite.
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clode
Trad climber
portland, or
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Mar 19, 2019 - 03:38pm PT
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Mr. Drool wonders what it's like to climb a geologist. As a R.G. in Oregon I can tell you it's rock hard!
But then that begs the question, "how hard is rock?" Answer: it depends on the rock.
All rock is hard, some rocks are just harder than others.
Climb on.
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Contractor
Boulder climber
CA
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Mar 19, 2019 - 04:59pm PT
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I’ve never climbed a geologist, how is it? How about an aplite dike?
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tuolumne_tradster
Trad climber
Leading Edge of North American Plate
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Mar 19, 2019 - 05:01pm PT
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To distinguish Aplite from marble you can use a metal surface (e.g., knife) to scratch
marble but not Aplite, which is almost exclusively quartz (SiO2) and feldspar [K(AlSi3O8)]. Also, marble (CaCO3) will react with hydrochloric acid, whereas Aplite will not. Some high-grade marbles are harder than others.
Check out this pegmatitic dike with quartz interior and feldspar margins...
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