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Mica and Calcite crystal? and a surprise
  
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jim hill




Joined: 03 Sep 2017
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Location: Bessemer, PA

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PostPosted: May 07, 2018 10:20    Post subject: Mica and Calcite crystal? and a surprise  

Found in Bessemer, PA.


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jim hill




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PostPosted: May 07, 2018 10:24    Post subject: Re: mica and calcite crystal ? and a surprise  

Forgot to post pic of this piece


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Bob Harman




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PostPosted: May 07, 2018 13:49    Post subject: Re: Mica and Calcite crystal? and a surprise  

JIM,
Not sure if you are asking a question about mica, but I do not see any in your photos. I also don't see where any tests have been attempted.

As to what I see, your first photo appears to show a broken piece of what most probably is calcite with iron staining on its surface and nearby. I think I can see cleavage areas so calcite is favored over quartz. Test this by putting a small amount of household vinegar on the white areas. If it fizzes it is calcite, no fizzing suggests that it is quartz. In this photo I see no intact crystals.

The second photo shows a small cavity lined by iron containing rhombohedral dolomite crystals called ferroan dolomite. This whole area is contained within grayish calcite or microcrystalline quartz (chalcedony or quartzite). Again test the grayish areas with vinegar. Fizzing = calcite; no reaction suggests quartz. This appearance is very common in the eastern and midwestern parts of the US.
BOB
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jim hill




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PostPosted: May 07, 2018 22:59    Post subject: Re: Mica and Calcite crystal? and a surprise  

thank you bob,
the first photo, the crystals in center had no reaction to vinegar, the burnt area was from hydrochloric acid. both pieces came from a singular stone which was dropped mica came from geology professor at ysu, the same person that burned the crystal , here are two others i found . they seemed to experience some kind of trauma . i picture these whole and unbroken looking like a giant geode



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