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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4248
Location: Germany
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 Posted: Mar 17, 2012 12:00 Post subject: Re: Collection of Joseph D'Oliveira |
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| Especially the wulfenite is simply stunning! Such a large piece of wulfenite on matrix is a highlight for most collections. I hope you'll post more of your specimens - not only the best ;-)
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Joseph DOliveira
Joined: 29 Jan 2012
Posts: 311
Location: Hanmer, Ontario
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| Posted: Mar 17, 2012 14:41 Post subject: Re: Collection of Joseph D'Oliveira |
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Thin plate of botryoidal malachite from the DRC, unfortunately I do not have the mine location for this specimen.
| Description: |
Malachite
Shaba, Democratic Republic of the Congo
12 x 6 x 1.5 cm
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58134 Time(s) |
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Joseph D'Oliveira
Hanmer, Ontario
Canada |
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Joseph DOliveira
Joined: 29 Jan 2012
Posts: 311
Location: Hanmer, Ontario
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| Posted: Mar 17, 2012 15:09 Post subject: Re: Collection of Joseph D'Oliveira |
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Very interesting cluster of hoppered pink halite crystals from Searles Lake in California, USA. The pink colour is attributed to bacteria incorporated when the crystals are formed.
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Halite
Searles Lake, Trona, California, USA
9 x 6 x 5 cm |
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58090 Time(s) |
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Joseph D'Oliveira
Hanmer, Ontario
Canada |
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Joseph DOliveira
Joined: 29 Jan 2012
Posts: 311
Location: Hanmer, Ontario
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| Posted: Mar 17, 2012 15:16 Post subject: Re: Collection of Joseph D'Oliveira |
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Tight cluster of stibnite crystals with the main crystal measuring 17cm. There is a slight bend at the top of the crystal which is common with this species.
| Description: |
Stibnite
Wuling Mine, Jiangxi Provence, China
17 x 4.5 x 2 cm |
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58017 Time(s) |
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Joseph D'Oliveira
Hanmer, Ontario
Canada |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5070
Location: Barcelona
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| Posted: Mar 17, 2012 15:17 Post subject: Re: Collection of Joseph D'Oliveira |
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| Joseph D'Oliveira wrote: |
Thin plate of botryoidal malachite from the DRC, unfortunately I do not have the mine location for this specimen.
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Probably from Mashamba West Mine, Kolwezi, Katanga (Shaba)
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Joseph DOliveira
Joined: 29 Jan 2012
Posts: 311
Location: Hanmer, Ontario
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| Posted: Mar 17, 2012 15:30 Post subject: Re: Collection of Joseph D'Oliveira |
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Thank you for the information Jordi.
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Joseph D'Oliveira
Hanmer, Ontario
Canada |
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Joseph DOliveira
Joined: 29 Jan 2012
Posts: 311
Location: Hanmer, Ontario
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| Posted: Mar 17, 2012 16:34 Post subject: Re: Collection of Joseph D'Oliveira |
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A very representative specimen of pyromorphite from China with crystals to 5mm. The colour contrasts very nicely with the white matrix.
| Description: |
Pyromorphite
Daoping Mine, Yangshuo, Guangxi Zhuang, China
9 x 6.5 x 5 cm |
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48504 Time(s) |
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Joseph D'Oliveira
Hanmer, Ontario
Canada |
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Louis Friend
Joined: 26 Jan 2012
Posts: 89
Location: Adelaide
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| Posted: Mar 19, 2012 00:51 Post subject: Re: Collection of Joseph D'Oliveira |
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Joseph:
You have a very nice collection. We have a few things in common - 300 piece collection, but imagine it will grow much, much larger given time.
Regards
louis
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"The aim of science is to make difficult things understandable in a simpler way; the aim of poetry is to state simple things in an incomprehensible way. The two are incompatible." Dirac |
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Joseph DOliveira
Joined: 29 Jan 2012
Posts: 311
Location: Hanmer, Ontario
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| Posted: Mar 21, 2012 20:25 Post subject: Re: Collection of Joseph D'Oliveira |
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A spike ball of marcasite from the Belle Fourche Reservoir in South Dakota. This is a self collected piece and comes from a shale formation that is submerged for most of the year. In the Fall, when the water is drawn down, the shale layer is exposed and you can collect the marcasite by walking along the beach.
Some of these spike balls appear to be a pseudo morph of marcasite after pyrite.
| Description: |
Marcasite
Belle Fourche Reservoir, South Dakota, USA
6 x 6 x 4 cm |
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48337 Time(s) |
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| Description: |
Marcasite
Belle Fourche Reservoir, South Dakota, USA
2.5 cm in diameter
Two additional spike balls of marcasite from Belle Fourche |
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48499 Time(s) |
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Joseph D'Oliveira
Hanmer, Ontario
Canada |
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Joseph DOliveira
Joined: 29 Jan 2012
Posts: 311
Location: Hanmer, Ontario
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| Posted: Apr 07, 2012 16:07 Post subject: Re: Collection of Joseph D'Oliveira |
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Here are a few of the calcite specimens in my collection.
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Calcite
Stanleigh Mine, Elliot Lake, Ontario, Canada
5 x 3 x 3 cm
Collected from a lamprophyre dyke on the 3500' level of the mine. |
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48165 Time(s) |
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Calcite
Dahisar Quarry, Mumbai, India
12 x 6 x 5 cm
White scalenohedral crystal cluster, the crystals have a matte lustre. An early piece from India. |
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48195 Time(s) |
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Calcite
San Juan de Rayas Mine, Gaunajuato, Mexico
8 x 5 x 5 cm
Striated, scalenohedral calcite crystals sitting on a marcasite matrix. |
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48230 Time(s) |
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Calcite
Rio Grande do Sul, Brazil
13 x 7 x 2 cm
Very thin plate of scalenohedral calcite from Brazil. |
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48158 Time(s) |
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Calcite
Santa Eulalia, Mexico
17 x 7 x 6 cm
Interesting colour zoning on this cluster, as the brown colour appears in only one direction. |
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48180 Time(s) |
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Joseph D'Oliveira
Hanmer, Ontario
Canada |
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Joseph DOliveira
Joined: 29 Jan 2012
Posts: 311
Location: Hanmer, Ontario
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| Posted: Jun 02, 2012 10:32 Post subject: Re: Collection of Joseph D'Oliveira |
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It has been a while since I have posted any new mineral specimens but Spring is a busy time of year. I recently made a trip to the Cobalt-Gowganda area here in Ontario, a very prominent silver producing area from the late 1800's to the 1970's. For the time being all of the mines have been abandoned but numerous waste piles of rock are left for the collector to poke through.
Most of the easy silver has been collected from the surface but a metal detector and a pick and shovel are all that is needed to discover a few nice specimens on a days outing. The following specimens are all from the Cobalt-Gowganda area, some are self collected and some have been purchased from other collectors.
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| Using the metal detector to locate "treasures" at an old mine site. The fencing that you see in the background is to protect against falling into an open hole. Many of the very rich silver veins were exposed on surface and mined out completely. |
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47858 Time(s) |
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Native silver crystals with a safflorite coating
Langis Mine, New Liskeard, Ontario, Canada
6x4.5x2 cm
This crystal was etched using acid to expose the herring bone silver crystals. As with most of these specimens, a thin coating of safflorite is attached to the silver. |
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47805 Time(s) |
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Native silver crystals (herring bone) covered with safflorite
Langis Mine, New Liskeard, Ontario, Canada
7x4x5 cm
Etched silver crystals with safflorite coating. |
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47899 Time(s) |
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Native Leaf Silver
Langis Mine, New Liskeard, Ontario, Canada
10x2x.3 cm
Nice slender leaf of native silver weighing 84 grms. |
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47849 Time(s) |
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"Float Silver"
Cobalt area
8x3.5x.5 cm
A piece of float silver from the cobalt area. Many of the silver veins were exposed on surface, during glaciation the some silver was removed and deposited further south as the glaciers travelled. The "float silver" can be identified by a spongy appearance as all of the other minerals have been naturally etched away. |
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47809 Time(s) |
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Native Bismuth
Keeley-Frontier Mine, Silver Centre, Ontario, Canada
16.5x12x1.5 cm
A cut and polished slab of gabbro showing native bismuth filling joint fractures. |
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47824 Time(s) |
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Arsenopyrite on safflorite
Harrison-Hibbert (Ruby) Mine, Cobalt, Ontario, Canada
8x5x3 cm
Druzy arsenopyrite crystals on massive safflorite. |
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47847 Time(s) |
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Argentite
Silver Queen Mine, Cobalt, Ontario, Canada
15x13x.2 cm
A complete leaf of argentite originally collected in 1914. This is the best example of an argentite leaf I've seen from the Cobalt area. |
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47926 Time(s) |
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Native silver crystals with a safflorite coating
Mensilvo Mine, Cobalt, Ontario, Canada
7.5x7x1 cm
A nice cluster of silver crystals on a leaf of native silver. Some of the crystals have a thin coating of safflorite. The specimen weighs 179 grams. |
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47850 Time(s) |
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Silver Crystals
Nippising Mine, Cobalt, Ontario, Canada
19x10.5x.5 cm
A large cut slab displaying a network of fine silver crystals and veinlets. The specimen is a brecciated vein of calcite. One funny sidebar to this spcimen, is the way the breccia pieces are arranged to show what looks like the face of a dog. |
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47826 Time(s) |
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Native silver on safflorite
Langis Mine, New Liskeard, Ontario, Canada
9x5x1 cm
Native silver on safflorite, if you look closely, you will see striations on the silver from the lower left to the upper right. These striations are slickensides and are formed as a result of movement in the fault where the silver was forming. |
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47776 Time(s) |
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Joseph D'Oliveira
Hanmer, Ontario
Canada |
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Joseph DOliveira
Joined: 29 Jan 2012
Posts: 311
Location: Hanmer, Ontario
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| Posted: Jul 05, 2012 05:55 Post subject: Re: Collection of Joseph D'Oliveira |
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A recently collected specimen of native copper crystals in calcite from the Copper Creek Mine, Batchawana Bay area, near Sault Ste Marie, Ontario, Canada. The copper crystals are free floating in the calcite.
The specimen was found in a creek bottom using a metal detector, it was then lightly etched with acid to remove oxidation and expose the copper crystals.
| Description: |
Native Copper Crystals
Copper Creek Mine, Batchawana Bay, Sault Ste Marie, Ontario, Canada
7x5x3.5 cm |
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47636 Time(s) |
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Joseph D'Oliveira
Hanmer, Ontario
Canada |
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: Jul 05, 2012 20:35 Post subject: Re: Collection of Joseph D'Oliveira |
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| Joseph D'Oliveira wrote: | A recently collected specimen of native copper crystals in calcite from the Copper Creek Mine, Batchawana Bay area, near Sault Ste Marie, Ontario, Canada. The copper crystals are free floating in the calcite.
The specimen was found in a creek bottom using a metal detector, it was then lightly etched with acid to remove oxidation and expose the copper crystals. |
Very cool specimen!
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Joseph DOliveira
Joined: 29 Jan 2012
Posts: 311
Location: Hanmer, Ontario
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| Posted: Dec 16, 2012 11:49 Post subject: Re: Collection of Joseph D'Oliveira |
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Large almandine garnet collected from a small pocket within a biotite schist. These large garnets are common in the area and typically display pitted faces from contact with the biotite within the schist. This specimen has seven good crystal faces and then typically is more rounded on the contact side.
| Description: |
Almandine Garnet
Kukagami Lake Road, Sudbury, Ontario, Canada
7 x 7 x 6.5 cm |
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46851 Time(s) |
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Native Silver in Bornite
Coleman Mine, Levack, Ontario, Canada
12 x 4.5 x 3 cm
Native silver in bornite from Sudbury is typically formed in thin sheets along joint contacts within bornite veins. These high copper veins are found in the foot wall rocks away from the nickel ore bodies that are commonly mined here. |
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46824 Time(s) |
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Pyrite
Nanisivik Mine, North West Territories, Canada
7 x 6 x 5 cm
Striated, interpenetrating cubes of pyrite from a now closed location. |
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46835 Time(s) |
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Baryte
Shirley Basin, near Casper, Wyoming
5 x 5 x 3.5 & 5 x 4 x 3 cm
Pair of Baryte blades self collected in the Shirley Basin area in central Wyoming. The Baryte blades can be found in small pockets along high cliffs of consolidated volcanic ash. I spent many weekends searching for these and only found one pocket in miles of cliff faces that were searched. |
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46774 Time(s) |
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Joseph D'Oliveira
Hanmer, Ontario
Canada |
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Chris Foltz
Joined: 28 Oct 2012
Posts: 92
Location: Maryland
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| Posted: Dec 16, 2012 12:08 Post subject: Re: Collection of Joseph D'Oliveira |
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Thanks so much for the spell-check.
Truly nice specimens...
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stone-cutter |
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