|
|
Post by Drummond Island Rocks on Sept 4, 2019 19:03:28 GMT -5
No idea what this stone actually is. I found this one back in the spring of 2017 while searching the shores of Lake Huron with Jugglerguy. I have never seen one like it. I had been afraid to cut thinking the pattern and color might have just been on the surface. In the end all rocks must be cut though. Do you remember this one Rob? ever seen one like it on your hunts?    Thanks for looking Chuck |
|
|
|
Post by MsAli on Sept 4, 2019 19:32:27 GMT -5
That is wild looking.
Love how the cab came out
|
|
|
|
Post by Jugglerguy on Sept 4, 2019 21:03:40 GMT -5
I vaguely remember that. It sure turned out nice. I only wish more of the red went throughout the rock. I don’t remember ever seeing another one like that.
|
|
|
|
Post by rockjunquie on Sept 4, 2019 21:11:09 GMT -5
THAT is really cool!!! Almost looks like dino bone. Very cool.
|
|
|
|
Post by Drummond Island Rocks on Sept 4, 2019 21:21:47 GMT -5
I vaguely remember that. It sure turned out nice. I only wish more of the red went throughout the rock. I don’t remember ever seeing another one like that. 2017 was the year I had Andrew with me. I do not remember which one of us found it. It was in the group shot of the rocks from the trip though. I only slabbed half of it. Need to glue it up and slab the rest. Chuck |
|
|
|
Post by Drummond Island Rocks on Sept 4, 2019 21:22:29 GMT -5
THAT is really cool!!! Almost looks like dino bone. Very cool. Thanks - dino bone was my first thought when looking at the exterior. |
|
|
|
Post by hummingbirdstones on Sept 4, 2019 21:48:54 GMT -5
I have no idea what it is, but I can say it is one cool stone! Love the pendant.
|
|
|
|
Post by wigglinrocks on Sept 4, 2019 21:57:58 GMT -5
Really nice cab and rock . Looks like a vesicular basalt , can't remember the name of the green crystals are though .
|
|
Tommy
Administrator 
Member since January 2013
Posts: 12,989
|
Post by Tommy on Sept 5, 2019 2:29:58 GMT -5
In the end all rocks must be cut though. This  |
|
|
|
Post by fernwood on Sept 5, 2019 5:54:12 GMT -5
Really nice cab and rock . Looks like a vesicular basalt , can't remember the name of the green crystals are though . Olivine? |
|
|
|
Post by Drummond Island Rocks on Sept 5, 2019 9:06:48 GMT -5
Really nice cab and rock . Looks like a vesicular basalt , can't remember the name of the green crystals are though . Good lead. After looking at google photos it looks like vesicular basalt is mostly just the dark matrix full of pits and voids. That makes the information below make sense for how this one looks. "Amydaloidal basalt forms when a vesicular basalt allows water to circulate through it (i.e., it is permeable) and deposits secondary minerals in the voids. Secondary minerals include carbonates, silica and zeolites." www.mindat.org/photo-521565.htmlChuck |
|
|
|
Post by wigglinrocks on Sept 5, 2019 9:22:34 GMT -5
Really nice cab and rock . Looks like a vesicular basalt , can't remember the name of the green crystals are though . Good lead. After looking at google photos it looks like vesicular basalt is mostly just the dark matrix full of pits and voids. That makes the information below make sense for how this one looks. "Amydaloidal basalt forms when a vesicular basalt allows water to circulate through it (i.e., it is permeable) and deposits secondary minerals in the voids. Secondary minerals include carbonates, silica and zeolites." www.mindat.org/photo-521565.htmlChuck Nailed it , amygdaloidal basalt with epidote crystals . I get the two confused . Vesicular has the empty holes . |
|
|
|
Post by Jugglerguy on Sept 5, 2019 14:47:10 GMT -5
There’s a lot of amygdaloidal basalt in the U.P., both in mine tailings and on the beaches, but I don’t think most of it is as nice rock. I was under the impression that most basalt does not shine up well, but this seemed to. Anyone have much experience working with basalt?
|
|
|
|
Post by Drummond Island Rocks on Sept 5, 2019 15:20:23 GMT -5
There’s a lot of amygdaloidal basalt in the U.P., both in mine tailings and on the beaches, but I don’t think most of it is as nice rock. I was under the impression that most basalt does not shine up well, but this seemed to. Anyone have much experience working with basalt? I have found amygdaloidal basalt on Lake huron before but they were mostly basalt with sparse minerals throughout. I have never found one completely filled like this. I thought Gowganda tillite was a basalt matrix? This one does not have an agate polish it is just a high satin finish. I tossed the cabbing scraps in the loto and they finished up last night. I have not really looked at them close but I know from some of the clean outs that the white quartz areas were undercutting. Chuck |
|
|
|
Post by captbob on Sept 6, 2019 10:32:57 GMT -5
There’s a lot of amygdaloidal basalt in the U.P., both in mine tailings and on the beaches, but I don’t think most of it is as nice rock. I was under the impression that most basalt does not shine up well, but this seemed to. Anyone have much experience working with basalt?Dallasite seems similar. Have tumbled a bunch of that and a high quality shine is pretty easy to achieve.
I know Chuck has cabbed some which I think were very nice.
|
|
|
|
Post by wigglinrocks on Sept 6, 2019 11:39:00 GMT -5
The green spots might also be Chlorite which is very common in the area . But I would think should undercut worse than the quartz , which might be calcite .
I have tumbled a fair amount of what I think is basalt . Pick a lot of the flat oval shaped ones on the beaches . Some get a semi gloss to gloss finish , others end up in the driveway . Seems the darker ones shine up better .
|
|
