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Collection of Joseph D'Oliveira
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Joseph DOliveira




Joined: 29 Jan 2012
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PostPosted: Apr 18, 2020 15:45    Post subject: Re: Collection of Joseph D'Oliveira  

It's been a while since I have posted but I am finally through my Tucson related work while still isolating at home.


FMF1.JPG
 Mineral: Fluorite
 Locality:
Mandrosonoro, Ambatofinandrahana District, Amoron'i Mania Region, Fianarantsoa Province, Madagascar
 Dimensions: 11x8.5x6 cm
 Description:
A nice fluorite plate from Madagascar, unfortunately the picture doesn't do it justice.
 Viewed:  1503 Time(s)

FMF1.JPG



FMF2.JPG
 Mineral: Fluorite
 Locality:
Mandrosonoro, Ambatofinandrahana District, Amoron'i Mania Region, Fianarantsoa Province, Madagascar
 Dimensions: 15x9x12 cm
 Description:
The large crystal measures 5.5x5 cm
 Viewed:  1502 Time(s)

FMF2.JPG



FMF3.JPG
 Mineral: Prehnite
 Locality:
Imilchil area, Anti-Atlas, Er Rachidia Province, Drâa-Tafilalet Region, Morocco
 Dimensions: 14x12x7 cm
 Description:
A rather unusual prehnite specimen.
 Viewed:  1503 Time(s)

FMF3.JPG



FMF4.JPG
 Mineral: Titanite on Ilmenite pseudomorped by Rutile with Microcline
 Locality:
Imilchil area, Anti-Atlas, Er Rachidia Province, Drâa-Tafilalet Region, Morocco
 Dimensions: 10x6x5.5 cm
 Description:
 Viewed:  1507 Time(s)

FMF4.JPG



FMF6.JPG
 Mineral: Malachite
 Locality:
Mindingi Mine (Mindigi Mine), Swambo, Kambove District, Katanga Copper Crescent, Katanga (Shaba), Congo DR (Zaire)
 Dimensions: 10x11x7 cm
 Description:
 Viewed:  1503 Time(s)

FMF6.JPG



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Joseph D'Oliveira
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Jordi Fabre
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PostPosted: Apr 18, 2020 16:54    Post subject: Re: Collection of Joseph D'Oliveira  

Hi Joseph,

About the Ilmenite after Rutile, in your image I can see Titanite on a Feldspar (Microcline) but I can't see the Ilmenite after Rutile. Maybe is not visible on the image?
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Joseph DOliveira




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PostPosted: Apr 18, 2020 17:00    Post subject: Re: Collection of Joseph D'Oliveira  

The titanite crystals grow on the blades of ilmenite and almost completely cover them. I have other pieces that have significantly more ilmenite but they are not as aesthetic. The ilmenite appears as dark areas deep within the microcline crystals.

Jordi Fabre wrote:
Hi Joseph,

About the Ilmenite after Rutile, in your image I can see Titanite on a Feldspar (Microcline) but I can't see the Ilmenite after Rutile. Maybe is not visible on the image?

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Tobi




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PostPosted: Apr 19, 2020 02:28    Post subject: Re: Collection of Joseph D'Oliveira  

I like the fluorites from Madagascar, nice specimens!
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Joseph DOliveira




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PostPosted: Apr 30, 2020 16:07    Post subject: Re: Collection of Joseph D'Oliveira  

Jordi,
I have had an opportunity to do some further work on these specimens and from what I can visually ascertain, the titanite crystals grow on the ilmenite pseudo's. The ilmenite/rutile appears to act as a seed point for the titanite crystals with some of the titanite crystals included by ilmenite/rutile. In many cases the titanite completely encompasses the ilmenite/rutile contact point and is only visible when the titanite crystals are accidentally blasted off during cleaning. Unfortunately, while I have a decent binocular microscope, I don't have the ability to recover photographs from it.

Stay safe everyone.

Jordi Fabre wrote:
Hi Joseph,

About the Ilmenite after Rutile, in your image I can see Titanite on a Feldspar (Microcline) but I can't see the Ilmenite after Rutile. Maybe is not visible on the image?

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Joseph D'Oliveira
Hanmer, Ontario
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Joseph DOliveira




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PostPosted: Sep 27, 2020 11:06    Post subject: Re: Collection of Joseph D'Oliveira  

A couple of new additions.


P1019516 (3).JPG
 Mineral: Quartz (variety amethyst)
 Locality:
Blue Points Mine, Pearl Lake, McTavish Township, Thunder Bay District, Ontario, Canada
 Dimensions: 9 x 6.5 x 3 cm's
 Description:
 Viewed:  449 Time(s)

P1019516 (3).JPG



P1019507 (2).JPG
 Mineral: Fluorite
 Locality:
De'an Mine, Wushan, De'an, Jiujiang Prefecture, Jiangxi Province, China
 Dimensions: 8 x 8 x 3.5 cm's
 Description:
 Viewed:  453 Time(s)

P1019507 (2).JPG



P1019509 (2).JPG
 Mineral: Fluorite, Arsenopyrite and Löllingite with Magnetite
 Locality:
Huanggang Mines, Hexigten Banner (Kèshíkèténg Qí), Ulanhad (Chifeng), Inner Mongolia Autonomous Region, China
 Dimensions: 7.5 x 6 x 3.5 cm's
 Description:
 Viewed:  451 Time(s)

P1019509 (2).JPG



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Joseph DOliveira




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PostPosted: Oct 23, 2020 15:39    Post subject: Re: Collection of Joseph D'Oliveira  

A couple of new additions.


P1019804 (2).JPG
 Mineral: Chalcopyrite with Arsenopyrite, Calcite and Muscovite
 Locality:
Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro, Portugal
 Dimensions: 11.5x8.5x6.5 cm's
 Description:
The large chalcopyrite crystal measures 7x6x3.8 cm's
 Viewed:  305 Time(s)

P1019804 (2).JPG



P1019807 (2).JPG
 Mineral: Copper
 Locality:
Keweenaw County, Michigan, USA
 Dimensions: 3x1.5x1.2 cm's
 Description:
 Viewed:  307 Time(s)

P1019807 (2).JPG



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Bob Morgan




Joined: 18 Jan 2018
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PostPosted: Oct 23, 2020 18:22    Post subject: Re: Collection of Joseph D'Oliveira  

Nice tetrahexahedral copper crystals!
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