Comments on: Driveway of delight

By: becky

becky — Fri, 25 Feb 2011 16:22:23 +0000

What an awesome idea for a drive way!

By: Andrew

Andrew — Fri, 19 Mar 2010 00:17:53 +0000

I found a nice example of actinolite rock in the Tiwalik Loop Trail in Joaquin Miller Park earlier this week, so I have proof of concept that the rock in this post is local.

By: Sheldon White

Sheldon White — Mon, 14 Dec 2009 16:42:35 +0000

Yes, there’s quite a bit to find in Wildcat Canyon, although it’s pretty overgrown.

By: Andrew

Andrew — Sun, 13 Dec 2009 03:42:51 +0000

I think that’s what Sheldon was talking about, in Wildcat Canyon. I’m glad to hear that such rocks exist near here and not just up in Sonoma and Mendocino counties.

By: M. Carey

M. Carey — Sat, 12 Dec 2009 21:44:45 +0000

I wonder if there are actinolite rocks in northern El Cerrito – Richmond hills ?? There are several very high-grade (almost eclogite) outcrops up near the crest of the hills, near the Arlington. That area is also mapped as melange and serpentine, I think.

By: Kim Hamilton

Kim Hamilton — Fri, 11 Dec 2009 04:48:28 +0000

There sure is a melange of rocks here. The bedrock is exposed in our garden and a few small actinolite rocks like in your picture have been found, along with a crumbly hard beige rock with occasional vein/pieces of a white quartz. If you are interested in poking around let me know.

By: Andrew

Andrew — Thu, 10 Dec 2009 18:37:58 +0000

That's cool! I'll have to poke around up there. Your area is mapped as Franciscan melange, which means it's a smorgasbord of different things all mixed up together. Did you follow the last link in my post? Here's another example, and here and here.

By: Kim Hamilton

Kim Hamilton — Wed, 09 Dec 2009 18:29:50 +0000

I’ve dug up a number of rocks in my garden in Upper Rockridge (north end of Estates Dr) which has the color of serpentine and made up of brittle crystalline fibers, quite sparkly in the light. The picture of the actinolite in the driveway is the closest picture to my rock I’ve seen. Where is the driveway so I can check it out? If my rock is actinolite, then the rock in the driveway could be local as mine is.

By: Sheldon White

Sheldon White — Mon, 30 Nov 2009 17:26:04 +0000

I see some of the little chalcedony nodules from the Sibley Quarry in there! And the Actinolite was probably from Wildcat Creek or Ring Mountain.