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Wednesday, July 15, 2009

Boiling Water With Stones


Storm (1969 - 2008) passed away on February 22, 2008 wilderness walk about!

Our ancestors used fire to cook their food, heat their homes, give light to the darkness, and keep the scary things away at night. It was tended and fed – like the other precious things of life – the children and the Gods. Today, we still use fire for all the same purposes. Today, that fire most often runs through copper wires. Though no longer the open fire of the past, it continues to feed us, light us and keep our fears at bay. Humans and fire – still we live and travel together on a shared path. (Steve Watts)

From microwaving popcorn to roasting potatoes around a car’s hot exhaust pipe, humans have developed a variety of cooking methods by which we render food safer, more digestible, and more palatable. Stone boiling is one of my favorite Stone Age (pardon the pun) methods. Some alternatives for boiling food are energy intensive and more difficult to prepare (rawhide bags, pottery). Stone boiling requires a fire, some rocks, and a coal-burned container.

I started experimenting with stone-boiling while living in Olympic National Park (WA State). I had heard that some types of rocks were better to use than others, but I couldn’t locate any information regarding which tended to crack (or explode!) and which are keepers for a lifetime. So here are the results of my very limited exploration on the subject at hand.

stone boiling

Let’s begin with the stone boiling contestants. From the nearest extinct volcanic pluton, let’s welcome Granite! Granite is relatively large-grained, which we think doesn’t bode well for this igneous rock.

Although most of this melange of cobbles started out as lowly depositional sand, these glassy rocks endured sweltering heat and enormous pressures in order to metamorphose into the beautiful Quartzites you see before you today! On a more serious note, there is some Quartz and other igneous rocks in here as well.

And coming all the way from the spreading Pacific Oceanic Ridge, taking 200 million years to get here, it’s Basalt! Fine-grained basalt has a good reputation for withstanding rapid heating and cooling amongst abos in the field.

Good luck to all of you!

Ahem. Now that I have that out of my system...

stone boiling

1.) Heating up the rocks for stone boiling...



2.) Got my coal-burned Western Red Cedar cooking vessel ready, in which I’ll test the hot rocks.




3.)Wooden tongs are quite useful in handling the heated stones. Notice the steam escaping from the bottom of the rock as it hits the lake.



Rocks relaxing in the “hot tub.” I subjected all rocks to at least five hot immersions (unless they broke before the fifth trial). Which will survive...which will crack under pressure?
stone boiling

p.s.—I love those tongs. Made from Yellow Cedar (Chamaecyparis nootkatensis)...lightweight, easy-to-carve...just the right width to afford a strong purchase on it when handling an awkwardly-shaped rock.

stone boilingPoor granite. This species suffered a near 100% failure rate. I’ve been told by a geology professor that water can infiltrate the interstitial spaces between the relatively-large quartz, feldspar and mica crystals and expand the rock when heated. To it’s credit, granite never sent shrapnel flying when it cracked.

Quartzite fared a little better, being smaller-grained and more homogenous throughout it’s structure. About 50% of these survived. I will note that when quartzite cracked, it sometimes exploded (but shards never traveled more than a foot or so away from the wooden bowl.

stone boiling


Basalt out-performed the other species of rock by far. Only about 5% of these cracked with use. A few years later, I still use these particular pieces of basalt. They show no signs of giving out. Incidentally, one can purchase smooth basalt cobbles in fancy home/yard furnishing stores.

After I get established in the San Gabriel Mountains of southern California this Fall, I look forward to testing the various rocks—gneiss, schist, talc, actinolite, pure quartz, feldspar, marble--found there. I’ll let you know how they work out for stone boiling....

Storm is the webmaster of StoneAgeSkills.com, find out about stone boiling and more... The name of the site says it all!

And the stone boiling winner is...

stone boiling

Originally published on StoneAgeSkills.com

Artcile and photos copyright Storm

http://www.natureskills.com/stone_boiling.html

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