bigfrickinrock
off to a rocking start
Stuck between a rock and a hard place!
Member since September 2019
Posts: 17
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Post by bigfrickinrock on Oct 15, 2020 12:38:02 GMT -5
Hi everyone!! I am a very rookie rock hound looking for some direction. I found these 2 rock 2 weeks ago on the west side of the keweenaw peninsula between Copper harbour and Gratiot river. I apologize if the pictures are not perfect, I am working on it. Thank You BFR
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Post by fernwood on Oct 15, 2020 13:25:14 GMT -5
First one looks like some type of fossil coral.
Second one might be basalt with epidote AKA Amygdaloidal basalt.
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bigfrickinrock
off to a rocking start
Stuck between a rock and a hard place!
Member since September 2019
Posts: 17
|
Post by bigfrickinrock on Oct 17, 2020 9:18:39 GMT -5
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Post by rockjunquie on Oct 17, 2020 10:07:41 GMT -5
Can't help, but I like your screen name.
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Post by stephan on Oct 17, 2020 17:25:08 GMT -5
Not sure about it being bone. The structures do resemble agate-filled cells in some ways, but it’s hard to say. I’m not terribly familiar with Lake Superior rocks, other than to say it’s definitely NOT a Laker. 😀 The coral is cool, and like it is a different type than Petoskey Stone. One way to test is to drizzle a little acid on it (something stronger than vinegar, like muriatic acid for pools). If it fizzes, it indicates calcium carbonate, which COULD mean bone (your coral or shell fossils would also fizz). maybe mohs can help. His rank claims that he can identify green rocks.
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rockstock
spending too much on rocks
Member since April 2019
Posts: 472
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Post by rockstock on Oct 17, 2020 21:52:42 GMT -5
I have found more than a few fossils in Michigan that have totally agatized and do not fizz at all with an acid bath. But that amby basalt one looks amazing.
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bigfrickinrock
off to a rocking start
Stuck between a rock and a hard place!
Member since September 2019
Posts: 17
|
Post by bigfrickinrock on Oct 19, 2020 8:12:07 GMT -5
Not sure about it being bone. The structures do resemble agate-filled cells in some ways, but it’s hard to say. I’m not terribly familiar with Lake Superior rocks, other than to say it’s definitely NOT a Laker. 😀 The coral is cool, and like it is a different type than Petoskey Stone. One way to test is to drizzle a little acid on it (something stronger than vinegar, like muriatic acid for pools). If it fizzes, it indicates calcium carbonate, which COULD mean bone (your coral or shell fossils would also fizz). maybe mohs can help. His rank claims that he can identify green rocks. thanks Stephen I will look up mohs. BFR
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Post by Drummond Island Rocks on Oct 19, 2020 10:22:40 GMT -5
Here's a picture of the last Amygdaloidal basalt I cut. This one was from Lake Huron. Not sure about your first one. Chuck
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bigfrickinrock
off to a rocking start
Stuck between a rock and a hard place!
Member since September 2019
Posts: 17
|
Post by bigfrickinrock on Oct 20, 2020 7:50:26 GMT -5
Here's a picture of the last Amygdaloidal basalt I cut. This one was from Lake Huron. Not sure about your first one. Chuck Thanks Chuck That looks very very close. BFR
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rockstock
spending too much on rocks
Member since April 2019
Posts: 472
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Post by rockstock on Oct 20, 2020 8:05:57 GMT -5
There seem to be a lot of variation of the basalt. Yours has very gemmy inclusions, looks nice.
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