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A mineralogical trip through the states of USA - Indiana
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Bob Harman




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Location: Indiana


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PostPosted: Jan 24, 2017 20:09    Post subject: Re: A mineralogical trip through the states of USA - Indiana  

Another large well displayed Indiana example that some dealers wish to have the area of calcite and barite crystals culled from the remainder of the geode and offered as a non-geode specimen.


fullsizeoutput_2498.jpeg
 Mineral: Calcite, Baryte and Quartz
 Locality:
State Route 37 road cuts, Harrodsburg, Clear Creek Township, Monroe County, Indiana, USA
 Dimensions: Geode is 23 cm. The larger calcite is 7.5 cm; the smaller one is about 6.0 cm. the barite cluster is 3.7 cm
 Description:
Calcites and a Barite cluster on Quartz
Found about 20 years ago and acquired by me about 15 years ago.
 Viewed:  2119 Time(s)

fullsizeoutput_2498.jpeg


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Bob Harman




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PostPosted: Jan 28, 2017 14:05    Post subject: Re: A mineralogical trip through the states of USA - Indiana  

Another nice example of a well displayed large Indiana geode with a dominant calcite aesthetically surrounded by several groups of dolomite, all on quartz. The quartz crystals in this example form nice free form growths.


fullsizeoutput_1e6e.jpeg
 Mineral: Calcite and Dolomite on Quartz
 Locality:
State Route 37 road cuts, Harrodsburg, Clear Creek Township, Monroe County, Indiana, USA
 Dimensions: geode is 13 cm, the calcite is 4.2 cm and the dolomite groups are up to 2.6 cm
 Description:
Self collected early 2016
 Viewed:  2038 Time(s)

fullsizeoutput_1e6e.jpeg


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Bob Harman




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PostPosted: Jan 29, 2017 18:24    Post subject: Re: A mineralogical trip through the states of USA - Indiana  

A recently collected large and well displayed example with calcites on quartz. From my private lands site in Washington County.


fullsizeoutput_24a3.jpeg
 Mineral: Calcites on Quartz
 Locality:
State Route 56 road cut, Canton, Washington County, Indiana, USA
 Dimensions: geode is 14 cm x 12 cm. Calcites are up to 2.2 cm
 Description:
Self collected from private land in 2015

In general my larger well displayed examples are much appreciated in my display cases at the regional shows.
 Viewed:  1991 Time(s)

fullsizeoutput_24a3.jpeg



fullsizeoutput_24a2.jpeg
 Mineral: Calcite on Quartz
 Locality:
State Route 56 road cut, Canton, Washington County, Indiana, USA
 Dimensions: geode is 14 cm x 12 cm. Calcites are up to 2.2 cm
 Description:
self collected on private land in Washington County
 Viewed:  1983 Time(s)

fullsizeoutput_24a2.jpeg


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Bob Harman




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PostPosted: Jan 31, 2017 15:42    Post subject: Re: A mineralogical trip through the states of USA - Indiana  

When I go field collecting at this time of the year, I expect to see freshly exposed examples associated with rock falls resulting from the recent freeze/thaw episodes. So it has been for years.
These examples, from the Indiana route 56 road cuts in Washington County, were high up on the rock wall and, unfortunately, unable to be retrieved intact. The several pix of the larger example show a large 18+ cm specimen with large calcites upon bright red dolomite. If it had been collected intact and cleaned up well, it would have been a show stopper in a display case, but over several years, it fragmented and finally fell in multiple small fragments.

You can see the very porous dolostone matrix fragmenting with slices falling off the wall. If you are unlucky, one of the larger pieces might fall like a guillotine cutting or slicing off your wrist. Since these pictures were taken, both high quality examples became history; unfortunately, not all high quality examples can be successfully collected.



fullsizeoutput_24ab.jpeg
 Mineral: Calcite on Dolomite
 Locality:
State Route 56 road cut, Canton, Washington County, Indiana, USA
 Dimensions: oval geode about 17cm x 11cm
 Description:
calcites on dolomite
This example was about 3.5 meters up on the high wall. It was never collected and finally fell as small fragments.
 Viewed:  1950 Time(s)

fullsizeoutput_24ab.jpeg



fullsizeoutput_24aa.jpeg
 Mineral: Calcite on Dolomite
 Locality:
State Route 56 road cut, Canton, Washington County, Indiana, USA
 Dimensions: geode is 18+ cm, the largest calcites might be 6 - 7 cm
 Description:
First or second year of exposure.

This example was about 4.5 meters up in the high wall.
 Viewed:  1951 Time(s)

fullsizeoutput_24aa.jpeg



fullsizeoutput_24a9.jpeg
 Mineral: Calcite on Dolomite
 Locality:
State Route 56 road cut, Canton, Washington County, Indiana, USA
 Dimensions: geode is about 18 cm calcites are 6 - 7 cm
 Description:
First or second year of exposure.
This example was about 4.5 meters up in the high wall
 Viewed:  1957 Time(s)

fullsizeoutput_24a9.jpeg



fullsizeoutput_24a8.jpeg
 Mineral: Calcite on Dolomite
 Locality:
State Route 56 road cut, Canton, Washington County, Indiana, USA
 Dimensions: geode is 18+ cm. The largest calcites are about 6 - 7 cm
 Description:
Third or fourth year of exposure. The geode is about 4.5 meters up on the high wall.

Note the splitting and fracturing of the surrounding dolostone matrix. These larger pieces can inflict serious injuries should they fall as you collect.

The next year or so the geode fell as multiple small pieces; unfortunately, it was never collected intact.
 Viewed:  1952 Time(s)

fullsizeoutput_24a8.jpeg


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Bob Harman




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PostPosted: Feb 14, 2017 14:23    Post subject: Re: A mineralogical trip through the states of USA - Indiana  

The field and stream geodes from Washington County Indiana tend to be large and very large. This example is on display as part of a small geode collection in the geology building at Indiana University. As you can see it is immense in size and weighs 347 lbs. These have very limited collector appeal, only making good yard rocks or decorations such as this one. Interestingly, these very large examples tend to have very small central cavities and be dingy or rusty stained inside.

Several of the geodes on the poster are from my collection.



fullsizeoutput_21e.jpeg
 Mineral: Quartz
 Locality:
Washington County, Indiana, USA
 Description:
Quartz geode, NOS
On display in the Indiana University geology department
 Viewed:  1821 Time(s)

fullsizeoutput_21e.jpeg



fullsizeoutput_157.jpeg
 Mineral: Quartz
 Locality:
Washington County, Indiana, USA
 Description:
Quartz geode, NOS
This geode weighs 347 lbs.
 Viewed:  1821 Time(s)

fullsizeoutput_157.jpeg


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Bob Harman




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PostPosted: Feb 14, 2017 14:34    Post subject: Re: A mineralogical trip through the states of USA - Indiana  

An example with more collector interest is this quartz geode containing a dominant and nicely placed and nicely terminated 6.5 cm baryte crystal nestled near the "back" of the quartz lining. A smaller partial crystal can be seen in the lower right area of the cavity


fullsizeoutput_24b2.jpeg
 Mineral: Baryte on Quartz
 Locality:
State Route 37 road cuts, Harrodsburg, Clear Creek Township, Monroe County, Indiana, USA
 Dimensions: Geode is 11cm, the baryte crystal is 6.5 cm
 Description:
Self-collected about 10 years ago at the Harrodsburg roadcuts. If culled out of the geode, examples such as these make for hi quality Midwest USA baryte specimens.
 Viewed:  1809 Time(s)

fullsizeoutput_24b2.jpeg


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PostPosted: Mar 14, 2017 15:36    Post subject: Re: A mineralogical trip through the states of USA - Indiana  

Found about 15 years ago, this aragonite consists of numerous white spiky needles on decayed ferroan dolomite in a geode cavity.


fullsizeoutput_24b5.jpeg
 Mineral: Aragonite on Dolomite (variety ferroan)
 Locality:
Monroe County, Indiana, USA
 Dimensions: the cavity is 11 cm x 5.5 cm the aragonite needles are up to 1.0 cm
 Description:
aragonite on decayed ferroan dolomite (limonite or ankerite?)
 Viewed:  1591 Time(s)

fullsizeoutput_24b5.jpeg


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Bob Harman




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PostPosted: Mar 29, 2017 10:34    Post subject: Re: A mineralogical trip through the states of USA - Indiana  

Finding fresh geodes in the limestone matrix is the way to go for dedicated collectors and finding "field and stream geodes" in creek beds is, for novices, very common, but explaining how the geodes weather out of the limestone to wind upon the creek beds is not so apparent. Finding geodes that are in the natural process of weathering out of their matrix is quite unusual. Here is one collected about 2005.


fullsizeoutput_24bc.jpeg
 Mineral: Quartz
 Locality:
Monroe County, Indiana, USA
 Dimensions: The geode is about 7 cm max dimension.
 Description:
quartz geode, NOS
 Viewed:  1401 Time(s)

fullsizeoutput_24bc.jpeg



fullsizeoutput_24bd.jpeg
 Mineral: Quartz
 Locality:
Monroe County, Indiana, USA
 Dimensions: the geode cavity is about 7 cm max dimension
 Description:
quartz geode, NOS
 Viewed:  1403 Time(s)

fullsizeoutput_24bd.jpeg


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PostPosted: Nov 11, 2017 11:05    Post subject: Re: A mineralogical trip through the states of USA - Indiana  

Bladed barite on quartz


fullsizeoutput_22fc.jpeg
 Mineral: Baryte on Quartz
 Locality:
Monroe County, Indiana, USA
 Dimensions: Specimen is 8 cm. Barite blades are up to 2.5 cm. The whole barite area is 4.6 cm
 Description:
Self collected 2006
 Viewed:  105 Time(s)

fullsizeoutput_22fc.jpeg


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