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Bob Harman
Joined: 06 Nov 2015
Posts: 468
Location: Indiana
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 Posted: May 27, 2018 14:47 Post subject: Re: A mineralogical trip through the states of USA - Indiana |
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One of my 2 cases at the recent 2018 Cincinnati show. The show theme for minerals was calcite and its many crystal forms.
| Mineral: | Calcites |
| Locality: | | Indiana, USA |  |
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| Description: |
| Some of these examples have never been previously displayed. The first time these have all been displayed together in 1 case. |
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1625 Time(s) |
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| Mineral: | Calcites |
| Locality: | | Indiana, USA | |
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1617 Time(s) |
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| Mineral: | Calcites |
| Locality: | | Indiana, USA | |
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1624 Time(s) |
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Bob Harman
Joined: 06 Nov 2015
Posts: 468
Location: Indiana
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| Posted: Jul 27, 2018 14:07 Post subject: Re: A mineralogical trip through the states of USA - Indiana |
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Two examples of Aragonite sprays on Quartz with some corroding iron oxides (limonite). Both self collected about 10 years ago.
| Mineral: | Aragonite on Quartz |
| Locality: | | Monroe County, Indiana, USA | |
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| Dimensions: | the diverging aragonite sprays are 2 cm - 3 cm. |
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1190 Time(s) |
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Bob Harman
Joined: 06 Nov 2015
Posts: 468
Location: Indiana
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| Posted: Aug 07, 2018 16:01 Post subject: Re: A mineralogical trip through the states of USA - Indiana |
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Two more examples of Indiana Millerite from my collection. Both were self-collected about 2007.
| Mineral: | Millerite on Quartz |
| Locality: | | Harrodsburg area, Clear Creek Township, Monroe County, Indiana, USA | |
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| Dimensions: | The millerite spray is 1.5 cm |
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1088 Time(s) |
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| Mineral: | Millerite nestled in Quartz |
| Locality: | | Harrodsburg area, Clear Creek Township, Monroe County, Indiana, USA | |
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| Dimensions: | The millerite spray is 2.0 cm |
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1096 Time(s) |
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Bob Harman
Joined: 06 Nov 2015
Posts: 468
Location: Indiana
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| Posted: Aug 10, 2018 20:56 Post subject: Re: A mineralogical trip through the states of USA - Indiana |
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One of the so called hallmarks of the rock structure called a quartz geode is that the quartz crystal tips are suppose to point inward toward the center of the cavity. While this is generally true, a very small percentage have other appearances. These are a few; all self collected.
| Mineral: | Quartz |
| Locality: | | Indiana, USA | |
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| Dimensions: | Both are about 9 cm |
| Description: |
Quartz geodes
Both examples have interesting free form quartz areas within the cavity. |
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1030 Time(s) |
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| Mineral: | Quartz |
| Locality: | | Indiana, USA | |
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| Dimensions: | geode is 10.0 cm |
| Description: |
Quartz Geode
Several quartz crystals lying side by side. The largest crystal is a full 1.0 cm and doubly terminated. Very rare. |
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1027 Time(s) |
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| Locality: | | Indiana, USA | |
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| Dimensions: | 1.0 cm doubly terminated crystal |
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Quartz geode
Close up of above example. |
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1029 Time(s) |
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Bob Harman
Joined: 06 Nov 2015
Posts: 468
Location: Indiana
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| Posted: Dec 07, 2018 11:29 Post subject: Re: A mineralogical trip through the states of USA - Indiana |
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Two unusual examples from my collection.
The first is a 15 cm x 15 cm geode showing a double cavity layer of druzy crystalline quartz tips atop blue-gray microcrystalline quartz (chalcedony).
The second example is an 11 cm x 7 cm oval and bi-septate geode with one cavity showing blue-gray microcrystalline quartz (chalcedony), while the adjacent cavity contains druzy clear quartz crystal tips.
As I understand crystal formation as related to crystal size, the faster the crystal forms, the smaller the crystal might be. So the formation of microcrystalline quartz (chalcedony) implies rapid formation. Interesting how this bi-septate example might have formed. BOB
| Mineral: | Quartz with Quartz (variety chalcedony) |
| Locality: | | Indiana, USA | |
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| Dimensions: | 15 cm x 15 cm |
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Crystalline quartz atop microcrystalline quartz (chalcedony)
Self collected about 10 years ago.
As seen , some patchy iron staining. |
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| Viewed: |
625 Time(s) |
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| Mineral: | Quartz with Quartz (variety chalcedony) |
| Locality: | | Indiana, USA | |
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| Dimensions: | 11 cm x 7 cm |
| Description: |
BI-septate example with druzy crystalline quartz and microcrystalline quartz (chalcedony)
Self collected about 12 years ago |
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622 Time(s) |
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Bob Harman
Joined: 06 Nov 2015
Posts: 468
Location: Indiana
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| Posted: Jan 07, 2019 18:46 Post subject: Re: A mineralogical trip through the states of USA - Indiana |
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From Washington County Indiana come the largest geodes, not only in Indiana, but probably in the US Midwest. Also found are many large colorful and very photogenic examples with collectible calcites. I have shown several in previous posts and here are 2 more. BOB
| Mineral: | Calcite on Dolomite |
| Locality: | | Washington County, Indiana, USA | |
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| Dimensions: | Oval example 16 cm x 12 cm. Calcites up to 1.3 cm |
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453 Time(s) |
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| Mineral: | Calcite on Dolomite |
| Locality: | | Washington County, Indiana, USA | |
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| Dimensions: | Oval geode is 20 cm. Calcites are up to 2 cm |
| Description: |
| Self collected in 2015.Large cabinet sized example, well displayed and very photogenic. |
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456 Time(s) |
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Bob Harman
Joined: 06 Nov 2015
Posts: 468
Location: Indiana
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| Posted: Jan 10, 2019 19:48 Post subject: Re: A mineralogical trip through the states of USA - Indiana |
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A recent quality find of a Baryte on Quartz
| Mineral: | Baryte on Quartz |
| Locality: | | Mission Valley Ravine, Monroe County, Indiana, USA | |
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| Dimensions: | nicely terminated 4.3 cm Baryte in 11 cm Quartz geode |
| Description: |
| Self collected about 2 years ago by a collector friend of mine. |
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350 Time(s) |
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Bob Harman
Joined: 06 Nov 2015
Posts: 468
Location: Indiana
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| Posted: Jan 29, 2019 13:52 Post subject: Re: A mineralogical trip through the states of USA - Indiana |
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Many geodes that, when opened, happen to break badly, can still be salvaged. Very collectible areas can be culled from the broken examples. These are 2 more such examples. Calcite on Quartz and Calcite on Dolomite.
Rather than being a "geode" the examples now become more traditional "specimens". BOB
| Mineral: | Calcite and Dolomite on Quartz |
| Locality: | | State Route 37 road cuts, Harrodsburg, Clear Creek Township, Monroe County, Indiana, USA | |
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| Dimensions: | The Calcite crystals are up to 3.5 cm |
| Description: |
| Segment of a very large geode. Self collected about 12 years ago. |
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| Viewed: |
176 Time(s) |
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| Mineral: | Calcite on Dolomite |
| Locality: | | State Route 56 road cut, Canton, Washington County, Indiana, USA | |
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| Dimensions: | The specimen is 8 cm. The Calcite crystal is 1.8 cm |
| Description: |
| Self collected about 10 years ago. |
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177 Time(s) |
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