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Silvia's Collection
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silvia




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PostPosted: Nov 07, 2022 13:20    Post subject: Common Minerals - Silvia's Collection  

A cabinet sized sample of a lustrous pyrite floater "sun" formed between an ancient bed of shale and clay near Sparta, Illinois.


01 - PYRITE SUN - SPARTA - USA - DISPLAY VIEW 1.jpg
 Mineral: Pyrite
 Locality:
Sparta, Randolph County, Illinois, USA
 Dimensions: 110 mm x 105 mm x 8 mm
 Description:
Display view 1
 Viewed:  585 Time(s)

01 - PYRITE SUN - SPARTA - USA - DISPLAY VIEW 1.jpg



02 - PYRITE SUN - SPARTA - USA - DISPLAY VIEW 2.jpg
 Mineral: Pyrite
 Locality:
Sparta, Randolph County, Illinois, USA
 Dimensions: 110 mm x 105 mm x 8 mm
 Description:
Display view 2
 Viewed:  584 Time(s)

02 - PYRITE SUN - SPARTA - USA - DISPLAY VIEW 2.jpg



03 - DETAIL OF THE CRYSTALS 1.jpg
 Mineral: Pyrite
 Locality:
Sparta, Randolph County, Illinois, USA
 Dimensions: 110 mm x 105 mm x 8 mm
 Description:
Detail of the crystals 1
 Viewed:  585 Time(s)

03 - DETAIL OF THE CRYSTALS 1.jpg



04 - DETAIL OF THE CRYSTALS 2.jpg
 Mineral: Pyrite
 Locality:
Sparta, Randolph County, Illinois, USA
 Dimensions: 110 mm x 105 mm x 8 mm
 Description:
Detail of the crystals 2
 Viewed:  584 Time(s)

04 - DETAIL OF THE CRYSTALS 2.jpg


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Roger Warin




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PostPosted: Nov 07, 2022 14:03    Post subject: Re: Silvia's Collection  

Hello Silvia,
Can you explain this growth?
Thanks.
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silvia




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PostPosted: Nov 07, 2022 17:54    Post subject: Re: Silvia's Collection  

I am just a retired science teacher. I think you might be able to explain it better than I.
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Michael Shaw
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PostPosted: Nov 07, 2022 20:35    Post subject: Re: Silvia's Collection  

The July/August 2022 issue of Rocks and Minerals has a very good in depth article explaining the growth of pyrite suns. Rocks & Minerals Vol. 97(4): 330-346.
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silvia




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PostPosted: Nov 08, 2022 13:35    Post subject: Re: Silvia's Collection  

Michael Shaw wrote:
The July/August 2022 issue of Rocks and Minerals has a very good in depth article explaining the growth of pyrite suns. Rocks & Minerals Vol. 97(4): 330-346.


Many thanks for the tip. I did see an article published by the Illinois geological survey, but I will also look at the RM article too.

Now that coal mining is becoming an activity of the past in the west (but a booming and ever growing industry in China - yes I am smiling) these pyrite suns will become a rare commodity. If you have not got a good one I suggest buying one.
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silvia




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PostPosted: Nov 14, 2022 14:36    Post subject: Pseudomorphs - Silvia's Collection  

The specimen contains a super-sharp pseudo of Malachite after Azurite, and the sharp, tabular rhombohedral habit of the original Azurite has been preserved superbly by the Malachite, to the point that you can see each edge and variation in the original crystal. The Malachite has an aesthetic chatoyant deep forest-green luster. The large prominent rhombohedral crystal of Malachite after Azurite is 53 mm wide.


01 - MALACHITE AFTER AZURITE - FRONT - VIEW 1.jpg
 Mineral: Malachite
 Locality:
Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico
 Dimensions: 120 mm x 80 mm x 50 mm
 Description:
View 1
 Viewed:  363 Time(s)

01 - MALACHITE AFTER AZURITE - FRONT - VIEW 1.jpg



02 - MALACHITE AFTER AZURITE - REAR - VIEW 0.jpg
 Mineral: Malachite
 Locality:
Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico
 Dimensions: 120 mm x 80 mm x 50 mm
 Description:
Matrix view
 Viewed:  362 Time(s)

02 - MALACHITE AFTER AZURITE - REAR - VIEW 0.jpg



03 - MALACHITE AFTER AZURITE - CLOSEUP.jpg
 Mineral: Malachite
 Locality:
Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico
 Dimensions: 120 mm x 80 mm x 50 mm
 Description:
Large crystal of malachite after Azurite
 Viewed:  362 Time(s)

03 - MALACHITE AFTER AZURITE - CLOSEUP.jpg


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silvia




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PostPosted: Nov 22, 2022 17:46    Post subject: Azurite - Silvia's Collection  

This is an attractive specimen of Azurite on matrix from the Milpillas Mine in Mexico. The piece features lustrous, deep electric blue well-formed crystals of Azurite associated with minor mint green Malachite sitting on contrasting matrix. The matrix is composed of Dickite, but the Azurite rests on what could be a primary Copper mineral, perhaps Chalcocite but the identity remains unknown. My favorite aspect of the piece is that the Azurite crystals are incredibly gemmy showing an electric indigo hue, a feature that has defined Azurite from the Milpillas mine.


01 - AZURITE ON MATRIX - MILPILLAS - MEXICO.jpg
 Mineral: Azurite
 Locality:
Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico
 Dimensions: 8 cm x 6 cm x 5 cm
 Description:
View 1
 Viewed:  266 Time(s)

01 - AZURITE ON MATRIX - MILPILLAS - MEXICO.jpg



02 - AZURITE ON MATRIX - MILPILLAS - MEXICO - MATRIX VIEW 1.jpg
 Mineral: Azurite
 Locality:
Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico
 Dimensions: 8 cm x 6 cm x 5 cm
 Description:
Matrix view
 Viewed:  266 Time(s)

02 - AZURITE ON MATRIX - MILPILLAS - MEXICO - MATRIX VIEW 1.jpg



03 - DETAIL OF SOME OF THE CRYSTALS.jpg
 Mineral: Azurite
 Locality:
Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico
 Dimensions: 8 cm x 6 cm x 5 cm
 Description:
Detail of the crystals 1
 Viewed:  266 Time(s)

03 - DETAIL OF SOME OF THE CRYSTALS.jpg



04 - DETAIIL OF SOME OF THE CRYSTALS.jpg
 Mineral: Azurite
 Locality:
Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico
 Dimensions: 8 cm x 6 cm x 5 cm
 Description:
Detail of the crystals 2
 Viewed:  266 Time(s)

04 - DETAIIL OF SOME OF THE CRYSTALS.jpg


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