Stone found on the beach

[800cable]

I found this on a beach in San Diego, but I am having trouble identifying it. I have found lots of stones with cloudiness of different colors, but this by far is my favorite one. Definitely sections that are translucent.

 

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[Indian Steve]

Sorry, I can't help with ID but that is a cool looking rock!

 

[stdenis_jd]

I have a similar one from a friend that brought it back from, get this, a San Diego beach lol...It looks a whole lot like Binghamite, but that is found in Minnesota. It's basically your typical chalcedony with various iron oxide mixed into the melt, maybe some manganese oxide.

It was my first ever cabochon a few years ago, please forgive the lack of decent polish and terrible shaping

 

[stdenis_jd]

I want more of this material now that I know what I'm doing and have the proper machinery

 

[Rocks A Lot]

Just looks like an agate to me. Pretty colors but the polish definitely makes it difficult to tell if it's a concretion from basalt. Which makes it more difficult to tell what minerals it could contain. However the fact that it tumbled easy is a clear indication that it's not any hard gemstone, they remain rough looking. Though it's possible to find pseudomorphs that can be very soft. Extremely rare to come by and color alone can't answer that.

 

[TerryC]

Looks like agate to me, also. Agate can be very colorful. Agate is always associated with basaltic rock as agate is the result of solutions squeezing into the cracks in basalt and other volcanic rocks. Here are some pics of Thunder Eggs I collected from southern CA in the last two weeks. I have collected 817 of these from the size of marbles to the largest you see at about 7 inches across. About half of those cut are fantastic! One, as you can see would, by definition, be a geode. 800cable.... PM me for directions to the hole I dug these out of. The are close enough to you to be a day trip!
TTC