rockbrain
Cave Dweller 
Member since January 2022
Posts: 1,736
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Post by rockbrain on Aug 9, 2022 17:33:08 GMT -5
@hplcman I almost asked about the hardness. That second piece looks just like the chunks of wave polished serpentine that I find loads of over in the Big Sur to Pismo and beyond. I'm astounded at the data base of rocks that's being stored in Bravura Cabochon Designs brain. On a side note if you look up Franciscan Chert there's some pretty cool pics of formations in the East Bay area. |
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hplcman
starting to spend too much on rocks
Just getting into this....
Member since August 2022
Posts: 130
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Post by hplcman on Aug 10, 2022 10:11:17 GMT -5
hplcman the rock is a piece of fransiscan chert. It’s microcrystalline quartz similar to jasper or agate, the formation is what differs from the other two. In short it’s lithified silica rich sea floor. Thanks for the information! I'm just starting with all of this, and really appreciate you guys sharing the knowledge. I looked up fransiscan chert and it's a fascinating story. I hike out the the beackes at Pt. Reyes National Seashore and there's a great example of this layered chert at the north end of Kellan Beach. I'll try to post a picture of it later on today. |
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hplcman
starting to spend too much on rocks
Just getting into this....
Member since August 2022
Posts: 130
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Post by hplcman on Aug 10, 2022 11:35:41 GMT -5
Kellan Beach Formation - I don't know if this is that fransiscan chert or not, but it sure is interesting!  |
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aGates
spending too much on rocks
Collecting lapidary machines
Member since January 2021
Posts: 403
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Post by aGates on Aug 11, 2022 20:08:58 GMT -5
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Post by liveoak on Aug 11, 2022 20:15:02 GMT -5
Looks like a score today Johnny, aGates , unless you normally drive around with crates of rocks in your car 
Patty
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rockbrain
Cave Dweller
Member since January 2022
Posts: 1,736
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Post by rockbrain on Aug 11, 2022 21:16:31 GMT -5
Interesting looking little saw.
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Post by hummingbirdstones on Aug 11, 2022 21:26:00 GMT -5
I hope there's still not Velveeta in that box!  |
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brybry
Cave Dweller
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Member since October 2021
Posts: 1,111
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Post by brybry on Aug 11, 2022 22:06:36 GMT -5
Pretty diehard to take the passenger seat out to fit more rocks too!
Lol, I'm assuming that isn't your daily ride.
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aGates
spending too much on rocks
Collecting lapidary machines
Member since January 2021
Posts: 403
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Post by aGates on Aug 12, 2022 7:52:49 GMT -5
Looks like a score today Johnny, aGates , unless you normally drive around with crates of rocks in your car Patty
I don't normally shucks it sure was a good day. Old stock from an 80 year olds uncle! Interesting looking little saw. Home built it looks old and robust. The hunk of obsidian in the vise from who knows when was a really smooth cut no marks to the eye I have high hopes. More posts to come. I hope there's still not Velveeta in that box!  Two 8 inch native copper strands look like fern leaves! Pretty diehard to take the passenger seat out to fit more rocks too! Lol, I'm assuming that isn't your daily ride. It damn straits is! I'm crazy about the air cooled! |
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Post by Son Of Beach on Aug 12, 2022 19:02:11 GMT -5
Did some weeding today A little sunlight and clean water makes the work that much easier. Half this bowl is heading back to the lake, tough decisions....  |
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Post by Son Of Beach on Sept 30, 2022 13:47:35 GMT -5
Probably the closest thing I'll ever find to a moss agate, very interesting rock. Hope it tumbles well.... Quartzite with quartz veins? Whaddayathink  Couple of nice pieces of coral, that little guy is fully intact
A good example of a conchodial fracture. I don't even remember where I heard it was a marker of agates or if it's even true I still look for that marking either way.  |
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Sept 30, 2022 14:55:24 GMT -5
Nice finds Chad! I love those fractures, thats one of the reasons I love chert so much, its a texture thing!  |
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Sept 30, 2022 14:57:12 GMT -5
The first one looks like “unakite moss agate”!
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Post by Son Of Beach on Sept 30, 2022 15:08:41 GMT -5
The first one looks like “unakite moss agate”! It's pretty neat, some new stuff going on |
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Post by jasoninsd on Sept 30, 2022 17:07:37 GMT -5
Son Of Beach - Chad, those finds are really cool. I always love finding coral for some reason. And that first one...sure looks like a moss agate to me!!
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Sept 30, 2022 20:06:59 GMT -5
Extra large, non breakable guitar pick.  |
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Post by Son Of Beach on Oct 2, 2022 13:07:09 GMT -5
Son Of Beach - Chad, those finds are really cool. I always love finding coral for some reason. And that first one...sure looks like a moss agate to me!! I wish it was, but it's close enough for me. |
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Tommy
Administrator 
Member since January 2013
Posts: 12,100
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Post by Tommy on Oct 16, 2022 13:22:07 GMT -5
Well I didn't actually find it, I bought it - BUT when we moved to Napa at the end of 2018 I lost track of it. I looked for it a few times and sadly figured I must have lost it but that made no sense. Anyway, I was digging to the bottom of a milk crate a few days ago and there it was. It's from here in Napa County - from the original Manhattan Mine which was producing cinnabar originally. Eventually the MM got swallowed up by what was the McLaughlin Mine which was a huge open pit gold mine which has now been cleaned up and turned into a "natural reserve" and lake which makes no sense considering nothing natural remains. Anyway, the reserve is owned(?) by the University of California. Regarding the ID of the material, it was first identified here on the forum by Mel Sabre52 , then confirmed by an old timers in the Lake County gem club. I've also seen the identical material for sale several times at local shows around the area. Given that the original Manhattan cinnabar mine literally does not exist on earth anymore I don't know how much more naturally unobtainable a material could get so I consider it my rarest piece and I'm happy it returned home and I'm not even mad at it.   Bravura Cabochon Designs |
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ericabelle
spending too much on rocks
Instagram acct: @erica_shoots_everything
Member since April 2021
Posts: 482
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Post by ericabelle on Oct 16, 2022 16:11:42 GMT -5
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Post by hummingbirdstones on Oct 16, 2022 18:54:01 GMT -5
Oh, boy I'm glad I found this thread! Sometimes I find a rock that I want to post, but I don't want to start a whole thread on it. So, don't make fun of me, but I was SO excited when I found this awesome piece of oolitic rock on a gravel road near my house today. I find tons of oolitic chert and chalcedony around here, but usually the oolites are much smaller. I have found some other oolites this big, but the whole rock was much smaller. Now I just have to decide what to do with it. The possibilities are endless!     Erica, that may be the coolest piece of oolite I've ever seen. Excellent find!  |
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