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Post by MrMike on Sept 10, 2016 18:04:50 GMT -5
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Deleted
Deleted Member
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Post by Deleted on Sept 10, 2016 19:38:59 GMT -5
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Post by MrMike on Sept 10, 2016 19:46:28 GMT -5
SG, how did you get the image to post here instead of the link?
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Deleted
Deleted Member
Member since January 1970
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Post by Deleted on Sept 10, 2016 19:53:17 GMT -5
Its my Super power.... Hit the quote button on my post. See my code
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Post by MrMike on Sept 10, 2016 20:22:49 GMT -5
Hate to ask but can I get a step by step???
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QuailRiver
fully equipped rock polisher
Member since May 2008
Posts: 1,634
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Post by QuailRiver on Sept 11, 2016 3:36:26 GMT -5
Hate to ask but can I get a step by step??? In the "Totally Rock Tumbling Photos" folder under the thread entitled "Posting Pics Instructions" RTH member iant posted very easy instructions for those who use photobucket as their host server for photographs. He states: In photobucket, select the "Direct Link" option next to your chosen photo and it will copy that link. Then, in this site, in the 'create post' window, click on the insert image icon which is near the end of the various options next to the email icon. Your picture should then appear. Hope that helps Larry C.
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Post by MrMike on Sept 11, 2016 7:06:37 GMT -5
Thanks Larry
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Post by MrMike on Sept 11, 2016 7:12:09 GMT -5
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napoleonrags
Cave Dweller
Member since October 2015
Posts: 474
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Post by napoleonrags on Sept 11, 2016 9:10:47 GMT -5
I would call it Tennessee-sausage-pizza agate.
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Post by MrMike on Sept 11, 2016 10:15:49 GMT -5
Sounds like a winner
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Post by Peruano on Sept 11, 2016 17:33:11 GMT -5
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Post by MrMike on Sept 11, 2016 17:49:31 GMT -5
Great info, thanks Tom
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Deleted
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Post by Deleted on Sept 12, 2016 9:30:49 GMT -5
Granite
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,687
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Post by Fossilman on Sept 12, 2016 9:43:57 GMT -5
I say that would be my guess too.....I cut lots of that material....
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ziggy
spending too much on rocks
Member since June 2016
Posts: 483
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Post by ziggy on Sept 12, 2016 10:36:52 GMT -5
I say that would be my guess too.....I cut lots of that material.... It doesn't really have agate characteristics. Looks kind of opaque to me and it almost looks like some sort of jasper if it's not the granite you mention.
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Deleted
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Member since January 1970
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Post by Deleted on Sept 12, 2016 12:46:40 GMT -5
I say that would be my guess too.....I cut lots of that material.... It doesn't really have agate characteristics. Looks kind of opaque to me and it almost looks like some sort of jasper if it's not the granite you mention. Some math: No conchoidal breaks anywhere. Opaque Grainy Multiple components ___________________ Granite
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Post by MrMike on Sept 12, 2016 18:18:51 GMT -5
Thanks all
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ziggy
spending too much on rocks
Member since June 2016
Posts: 483
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Post by ziggy on Sept 12, 2016 19:27:11 GMT -5
It doesn't really have agate characteristics. Looks kind of opaque to me and it almost looks like some sort of jasper if it's not the granite you mention. Some math: No conchoidal breaks anywhere. Opaque Grainy Multiple components ___________________ Granite I tend to agree with you and fossilman . Sounds better than agate or jasper. I was holding out some hope for him with the "if it's not the granite" part. From the Wiki page: By definition, granite is an igneous rock with at least 20% quartz and up to 65% alkali feldspar by volume. Also from Wiki: Agate /ˈæɡət/ is a cryptocrystalline variety of silica, chiefly chalcedony, characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks. Those rocks are definitely not any kind of chalcedony.
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Deleted
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Post by Deleted on Sept 13, 2016 1:03:38 GMT -5
Some math: No conchoidal breaks anywhere. Opaque Grainy Multiple components ___________________ Granite I tend to agree with you and fossilman . Sounds better than agate or jasper. I was holding out some hope for him with the "if it's not the granite" part. From the Wiki page: By definition, granite is an igneous rock with at least 20% quartz and up to 65% alkali feldspar by volume. Also from Wiki: Agate /ˈæɡət/ is a cryptocrystalline variety of silica, chiefly chalcedony, characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks. Those rocks are definitely not any kind of chalcedony. Chalcedony isn't necessarily found in certain metamorphic rocks. Chalcedony IS metamorphic rock. It's is formed in volcanic regions by a water based chemistry. Water metamorphosing the rocks into agates and otherwise.... This ain't it.
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ziggy
spending too much on rocks
Member since June 2016
Posts: 483
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Post by ziggy on Sept 13, 2016 6:26:56 GMT -5
Chalcedony isn't necessarily found in certain metamorphic rocks. Chalcedony IS metamorphic rock. It's is formed in volcanic regions by a water based chemistry. Water metamorphosing the rocks into agates and otherwise.... This ain't it. The wiki said chalcedony could be commonly found in metamorphic rocks. That would make sense since it is a metamorphic rock as well. Seems to me that finding agate "in" a metamorphic rock is entirely possible. Up in Keweenaw there are agates actually inside rocks. You can find them still in the cliffs and crags up there. Along certain beaches, they are still weathering out of the rocks on shore. Going through the mine piles can turn up agates inside of poor rock. They have to be broken out. Lots of them are copper replacement agates with copper banding. Lake superior agates are actually formed inside voids in the volcanic igneous host rock and the exterior of the agate when freshly weathered out reflects the rough interior walls of the void. Of course, these rockbound agates are also caused by water creating the metamorphic conditions. This entry from the Gitche Gumee agate and history museum explains agate formation: Agates develop as secondary deposits in hollow cavities, called vesicles. Although they can form in all types of host rock, most of the world's agates developed in ancient volcanic lava. When the continents were first forming, layers of molten lava pushed toward the earth's surface through rift zone cracks, volcanoes, and other geologic events. Within the lava, there were pockets of trapped gases. Later, these gases escaped through cracks that formed as the igneous rock cooled and hardened, leaving hollow cavities. Other cracks and seams also formed when adjoining sections of lava cooled at different rates. These empty cavities and seams filled with fluids rich in dissolved and suspended quartz molecules (silica), as well as other mineral impurities. When the silica concentration became supersaturated, it developed a gelatin-like consistency either throughout the pocket or in a layer that served as the active crystallization front. Over time, the silica molecules began to form miniature fibrous microcrystals that attached to the sides of the cavity or seam. During the filling-in process other mineral impurities collected at the inside of the chalcedony silica band, forming intervening and often contrasting bands. This pattern repeated until the entire vesicle was filled in, or until all the silica rich solution was used up. If there was the proper balance of silica and mineral impurities, then the entire cavity filled with alternating bands. If there was an insufficient quantity of mineral impurity or if the pressures and temperatures changed, the cavity completed filling in with macrocrystalline quartz, or another form of silica. So according to someone that I would consider an expert on everything agate, agates ARE formed and found IN igneous (and other types of) rocks (until they are weathered out or otherwise liberated.) From other research: Much of the agate not found in pockets (vesicles) is actually formed in fissures. It is this type of agate most likely to be found in non igneous agate bearing formations. I personally was skeptical of the agate possibilities of his sample from the first close up.
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