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General Climbing Discussion

Topic Date User
buying boulders 24-Jun-2013 At 12:44:17 PM Snappy
On 24/06/2013 One Day Hero wrote:
>On 24/06/2013 Snappy wrote:
>>My assumption (which you can feel free to
>>disregard, or google, if you want) is that extrusive rock such as rhyolite
>>would have a higher porosity than intrusive rock such as granite.
>Not the case with Canberra Rhyolite.

Yep, turns out rhyolite has quite a range (including less porous than granite).

On 24/06/2013 Snappy wrote:
>Seeing as I am interested now:
>Page 2.
>Granite: Dry density: 2.53 2.62 Porosity:1.02 2.87%
>Rhyolite: Dry density:2.40 2.60 Porosity:0.40 4.00%
>Sandstone: Dry density: 1.91 2.58 Porosity:1.62 26.4%

I am guessing that the Canberra rhyolite you are talking about falls closer to the 0.4% than the 4% then.

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