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A general guide for using the Forum with some rules and tips
New find ID help
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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fuss




Joined: 16 Aug 2018
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PostPosted: Sep 05, 2018 07:46    Post subject: New find ID help  

I found this in North central WI along side of a wooded rural road. I stopped to pick it up because in the daylight it looks turquoise/cyan in color and thought it would be a nice landscape stone. Its actually more gunmetal blueish in color under controlled light. It is around 12-14lbs and is magnetic.Has a grey streak and scratches with a steel knife. The surface is smooth. There are also some black and white crystal areas, I could only get a photo of the white patch (barely), and the black one is to small to photograph with my current set up but is seen with a loupe. Is this just some kind of igneous rock? thx.


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Dale Hallmark




Joined: 16 Jun 2014
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PostPosted: Sep 05, 2018 10:23    Post subject: Re: New find ID help  

Probably Magnetite.

Dale
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John Betts




Joined: 07 Jun 2012
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PostPosted: Sep 05, 2018 10:39    Post subject: Re: New find ID help  

Does the mineral itself attract iron? Is a paper-clip attracted to the mineral?
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fuss




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PostPosted: Sep 05, 2018 13:19    Post subject: Re: New find ID help  

It does not attract a paper clip.Thx.
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Bob Harman




Joined: 06 Nov 2015
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PostPosted: Sep 05, 2018 13:41    Post subject: Re: New find ID help  

While I am no expert on Wisconsin rocks and minerals, I see 2 problems.

First, your rock itself is sort of a generic dark grey blue with no real specific characteristics; in general not at all easy to ID from just photos. Secondly, in your initial post, you mention the rock being magnetic while in your most recent posting you note that the rock does not attract a paper clip. Not sure what to make of that.
Anyway my best idea is that, based mostly on your last picture, the example is a water worn piece of vesicular basalt, with iron oxide (rusty stained) veins, known to be found in North central Wisconsin. The small white area is also generic; anything from quartz, calcite to a spot of feldspar etc etc. BOB
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Dale Hallmark




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PostPosted: Sep 05, 2018 13:46    Post subject: Re: New find ID help  

A rock or mineral can be magnetic meaning it attracts iron. The other is that it is attracted to a magnet. Which is what I assumed he meant...not that the rock was actually magnetic which would have been a loadstone. Still lthink Magnetite.

Dale



Bob Harman wrote:
While I am no expert on Wisconsin rocks and minerals, I see 2 problems.

First, your rock itself is sort of a generic dark grey blue with no real specific characteristics; in general not at all easy to ID from just photos. Secondly, in your initial post, you mention the rock being magnetic while in your most recent posting you note that the rock does not attract a paper clip. Not sure what to make of that.
Anyway my best idea is that, based mostly on your last picture, the example is a water worn piece of vesicular basalt, with iron oxide (rusty stained) veins, known to be found in North central Wisconsin. The small white area is also generic; anything from quartz, calcite to a spot of feldspar etc etc. BOB
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fuss




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PostPosted: Sep 05, 2018 13:55    Post subject: Re: New find ID help  

Thanks Bob, I meant that a magnet sticks to it.
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fuss




Joined: 16 Aug 2018
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PostPosted: Sep 05, 2018 14:04    Post subject: Re: New find ID help  

Thanks Dale.
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Josele




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PostPosted: Sep 05, 2018 14:33    Post subject: Re: New find ID help  

Another vote for basalt, which usually contains enough magnetite to be attracted by a magnet.
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Susan Robinson




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PostPosted: Sep 06, 2018 17:16    Post subject: Re: New find ID help  

Lodestone, not loadstone.
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fuss




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PostPosted: Oct 12, 2018 07:27    Post subject: Re: New find ID help  

Update, It turns out to be slightly magnetic, a paper clip did not seem to attract to it but dangling a cheap lightweight necklace chain next to it the rock pulls it to itself. Anyway back to being a doorstop with it..


fuss wrote:
It does not attract a paper clip.Thx.
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