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Need Help on Identifying Geode Type and Mineral
  
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Ethan David




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PostPosted: Aug 23, 2017 12:52    Post subject: Need Help on Identifying Geode Type and Mineral  

I was hiking in the wilderness near Denali National Park, when I came across a scree slope. Being an adventurous person, I started to climb up. However, somewhere along I came
across this. I have a few questions:

What mineral are the arches constructed of?

How rare are arches in geodes?

Thanks,
Ethan



0823171341b.jpg
 Mineral: I have no idea...
 Dimensions: 8 cm
 Description:
 Viewed:  1611 Time(s)

0823171341b.jpg


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Ethan David




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PostPosted: Aug 23, 2017 13:04    Post subject: Re: Need Help on Identifying Geode Type and Mineral  

Ill post better pictures soon. I have a pretty busy schedule.
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Bob Harman




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PostPosted: Aug 23, 2017 13:43    Post subject: Re: Need Help on Identifying Geode Type and Mineral  

ETHAN, First of all that is not any geode, either sedimentary or igneous (thunderegg) the I am familiar with.

As to "arches in geodes", if you mean quartz crystals that grow sort of like the following, they are common in Indiana examples. Both quartz and calcite "arches" are known. BOB



fullsizeoutput_246c.jpeg
 Mineral: QUARTZ geode, NOS
 Locality:
Monroe County, Indiana, USA
 Dimensions: 10 cm
 Description:
Aesthetically iron stained quartz with an "arch" of quartz crystals crossing the central hollow cavity.
 Viewed:  1573 Time(s)

fullsizeoutput_246c.jpeg


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Ethan David




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PostPosted: Aug 23, 2017 13:45    Post subject: Re: Need Help on Identifying Geode Type and Mineral  

Here is a pic in the same position as the first.


blah.jpg
 Mineral: ?????
 Description:
 Viewed:  1569 Time(s)

blah.jpg


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Ethan David




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PostPosted: Aug 23, 2017 14:01    Post subject: Re: Need Help on Identifying Geode Type and Mineral  

Thanks, although I called it a geode because it was one. Other more broken pieces were laying around. So, they formed a geode "ball" originally. So , I guess its a piece of a geode then...
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vic rzonca




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PostPosted: Aug 23, 2017 18:24    Post subject: Re: Need Help on Identifying Geode Type and Mineral  

Geodes differ from vugs in that the former were formed as early, rounded, structures within the surrounding rock and are often removed intact, whereas vugs are irregularly shaped pockets, voids or cavities within a formation, often along a vein or in breccia. Geodes also differ from "nodules" in that a nodule is a mass of mineral matter that has accreted around the nodule nucleus. Both structures had the minerals contained within, deposited from groundwater or hydrothermal processes. Geodes commonly have a chalcedony (cryptocrystalline quartz) shell lined internally by various minerals, often as crystals, particularly calcite, pyrite, kaolinite, sphalerite, millerite, barite, celestite, dolomite, limonite, smithsonite, opal, chalcedony and macrocrystalline quartz, which is by far the most common and abundant mineral found in geodes. Geodes are found mostly in basaltic lavas and limestones. The Warsaw Formation in the Keokuk region near the area where Missouri, Iowa, and Illinois join contains abundant geodes. Got this from Wikipedia, seems accurate. Your piece may be a vug, or breccia filling, a geode is a fairly definite object. As has been said about a certain form of literature, I can't tell you what it is, but I know it when I see it. It seems to be calcite, could be a speleothem or flow stone, just a guess.


IMG_1389.jpg
 Description:
 Viewed:  1497 Time(s)

IMG_1389.jpg



IMG_1390.jpg
 Description:
 Viewed:  1492 Time(s)

IMG_1390.jpg


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Ethan David




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PostPosted: Aug 23, 2017 19:35    Post subject: Re: Need Help on Identifying Geode Type and Mineral  

Ah, thank you. That's probably what it was. Thanks again for explaining this.
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