Small Treasures

Jasper Patterns, Owyhee country

OK, OK, I've been pushing the Owyhee jasper a lot lately on this blog. The truth is, that's about the only rockhounding I've had time for lately, and most of it has been just going through the pile of material I brought back from my last trip. I've been cutting a lot of pieces on my Lortone 10" saw, with mixed results as I've mentioned before. Sometimes there is great stuff, and sometimes there is just another wasted hour of saw-time.

These never saw the saw: they were fragments of a rock I broke open to see what it was made of. I knew right away it was something special, but it was not big enough to slab. So I opted to toss them in the tumbler - and both came out smooth and lovely, with handsome patterns on all sides. (Both have a lot of blue on at least one face.)

Anyhow, nice stuff...of unknown provenance. I suppose I could keep better records when I am in the field, i.e. get a GPS plot of every piece I pick up - but hey. I'd rather be looking for rocks than bending over my laptop. Anytime.

I will be traveling for the next few weeks, so probably not posting. Maybe I'll bring something interesting home.

Unexpected Fossils

Fossil leaves/needles, Owyhee country

Sometimes, when I am in serious rock-collecting mode, I am picking things up on a whim - a flash of color or pattern might catch my eye. But I generally don't spend a lot of time inspecting each one. Often they just go into the bag for future study. Maybe this is why my car rides so slow when I come home from a trip!

As I have mentioned in previous posts, I was recently collecting in one of my favorite areas, the Owyhee mountains on eastern Oregon. I have been sorting through the specimens I collated, tossing out some, and polishing those that are worth the effort, especially picture jaspers. (see earlier blog post)

But this one was a surprise, different from anything else I saw, and with a pale purple that caught my eye. I tossed it in the bag and only took a closer look today. Breaking off a piece revealed an inner layer  crammed with leaf fossils. I haven't identified them, but they look like conifer needles, twigs etc. strewn throughout a single layer in what I am guessing is rhyolite tuff. A nice surprise!

Christmas Morning

Owyhee Jaspers revealed

One great advantage of a rock saw is that you can non-destructively look inside a weathered rock whose outward appearance is almost nothing like its inside. I have just come home from eastern Oregon with huge amounts of jasper from the Owyhee country, but very rarely are the patterns and colors obvious through the weathered crust. Some things that look intriguing on the surface are dull inside. However, the reverse is also true - some real treasures have no outward sign of what's inside until you break them open - or use a saw.

In the past I had nothing more than a rock hammer to see what was inside - but jasper is really just a natural glass, and often cleaves and shatters in unexpected, and unwanted, ways. I hate to think about the number of really fine rocks that have disintegrated under my hammer! A lot of weathered picture jaspers, for example, are riddled with cracks, which is precisely why there are such great patterns in the first place. These clearly have no business being hammered...

The saw, meanwhile, provides a window into the rock, without risking damage. Now, all I have to do is choose the pieces that look good - like the three above, which I just cut yesterday from very humble fist-sized pieces. The best  go into the tumbler to smooth out the rest of the stone.

After this last trip, I've got many, many more waiting to be opened up.  Can't wait.