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Chalcocite

Posted by Rock Currier  
avatar Chalcocite
December 24, 2009 01:35AM
This Article is Under Construction





Click here to view Best Minerals C and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.



Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities?



ChalcociteCu2S Monoclinic

Chalcocite & Calcite, Levant Mine, Cornwall, England


Chalcocite, Bristol, Connecticut, USA ~2.5cm wide


Here will go a general discussion of chalcocite and chalcocite specimens.


ChalcociteAustraliaQueensland, Mt Isa - Cloncurry area, Gunpowder District, Mount Gordon, Mammoth Mine

Chalcocite 3.6cm wide
Chalcocite 3.5cm wide


Chalcocite 3.6cm wide
Chalcocite 3.2cm wide


Chalcocite 3cm wide
Chalcocite 2.1cm wide


Chalcocite 2.9cm wide



ChalcociteAustraliaWestern Australia, Pilbara Region, East Pilbara Shire, Telfer Mine

Chalcocite 2.2 x 1.7 x 1.4 cm


This mine produced some killer specimens, including sharp prisms as long as your finger, with excellent lustre. Sensation at Tucson several years back (2001?) with prices to match and illustrated on the front cover of Australian Journal of Mineralogy Vol. 12, No.1 (http://www.mineral.org.au/pubs/ajm.html).



ChalcociteChileAtacama Region, Chañaral Province

Chalcocite on Calcite ~7.5cm wide




ChalcociteCongo, Democratic Republic ofKatanga (Shaba)

Chalcocite 1.6cm tall
Chalcocite & Calcite 1.3cm tall


ChalcociteCongo, Democratic Republic ofBouenza Department, Boko Songho District, M'Passa Mine

Chalcocite ~30cm wide
Chalcocite 5cm tall


ChalcociteCongo, Democratic Republic ofKatanga (Shaba), Kipushi, Kipushi Mine (Prince Léopold Mine)

Chalcocite 4cm wide




ChalcociteGermanyBaden-Württemberg, Black Forest, Wolfach, Oberwolfach, Rankach valley, Clara Mine

Chalcocite FOV 3mm




ChalcociteKazakhstanKaragandy Province (Qaragandy Oblysy; Karaganda Oblast'), Dzhezkazgan (Zhezqazghan)

Chalcocite & Calcite 9.4cm tall
Chalcocite & Barite 10cm tall


1.2cm Chalcocite on Calcite
Chalcocite 2.7cm tall


ChalcociteKazakhstanKaragandy Province (Qaragandy Oblysy; Karaganda Oblast'), Dzhezkazgan (Zhezqazghan), Dzhezkazgan Mine (Zhezqazghan Mine)

Chalcocite & Calcite 6cm wide
Chalcocite 1.7cm wide


ChalcociteNamibiaOtjikoto (Oshikoto) Region, Tsumeb

Chalcocite 3.4cm wide
Chalcocite 2.4cm wide


ChalcociteRussiaUrals Region, Bogoslovsk

Chalcocite ~7cm tall




ChalcociteUKEngland, Cornwall

Chalcocite & Quartz 3.7cm tall
Chalcocite 2.5cm wide


Chalcocite ~8cm wide
Chalcocite 2.3cm tall


ChalcociteUKEngland, Cornwall, Camborne - Redruth - St Day District

Chalcocite 4.2cm tall
Chalcocite 1.4cm


ChalcociteUKEngland, Cornwall, Camborne - Redruth - St Day District, Illogan, Carn Brea and Tincroft United Mine, Carn Brea Mine (incl. Tregajorran Mine)

Chalcocite 4cm
Chalcocite 2.6cm wide


ChalcociteUKEngland, Cornwall, Camborne - Redruth - St Day District, Illogan, Carn Brea and Tincroft United Mine, Cook's Kitchen Mine

Chalcocite ~7cm tall
Chalcocite 2.5cm tall


ChalcociteUKEngland, Cornwall, Camborne - Redruth - St Day District, Illogan, Carn Brea and Tincroft United Mine, Tincroft Mine

Chalcocite 4.3cm wide
Chalcocite ~4cm wide?


ChalcociteUKEngland, Cornwall, Mount's Bay District, Crowan, Crenver & Wheal Abraham (incl. Wheal Sarah; Great Drym Consols)

Chalcocite ~6cm wied




ChalcociteUKEngland, Cornwall, St Ives District, St Ives, St Ives Consols (incl. Wellesley Mine; Wheal Mary)

Chalcocite 3.5cm tall
Chalcocite 4.5cm tall


Chalcocite ~7cm wide
Chalcocite ~7cm tall


Chalcocite ~7cm wide
Chalcocite ~4cm wide


Chalcocite ~15cm wied




ChalcociteUKEngland, Cornwall, St Just District, St Just, Pendeen, Geevor Mine (North Levant Mine)

Chalcocite 3.2cm tall
Chalcocite 2.5cm


ChalcociteUKEngland, Cornwall, St Just District, St Just, Trewellard, Levant Mine

Chalcocite on Calcite ~7cm tall
Chalcocite on Calcite ~7.5cm wide


Chalcocite on Calcite ~7cm wide
Chalcocite ~11cm wide


ChalcociteUSAArizona, Yavapai Co., Black Hills (Black Hill Range), Verde District, Jerome

Chalcocite ~3.5cm wide




ChalcociteUSAColorado, Clear Creek Co., Idaho Springs District

Chalcocite ~6cm tall




ChalcociteUSAConnecticut, Hartford Co., Bristol, Bristol Copper Mine

Chalcocite 5.3cm tall
Chalcocite & Calcite 3.9cm tall


Chalcocite ~7.5cm wide
Chalcocite 4cm wide
.
Chalcocite ~5cm wide


Chalcocite & Calcite ~5cm tall
Chalcocite ~7.5cm wide
.
Chalcocite ~12.5cm wide


Chalcocite ~4cm tall
Chalcocite ~7cm tall


Chalcocite ~7cm wide
Chalcocite ~5cm wide


Chalcocite twin ~2.7cm wide
Chalcocite ~4cm tall


Chalcoite twin on Calcite ~5cm wide
Chalcocite on Calcite ~7cm wide


ChalcociteUSAMontana, Silver Bow Co., Butte District (Summit Valley District)

Chalcocite on Quartz ~5cm wide
Chalcocite ~3cm wide


Chalcocite 7cm wide
Chalcocite 3cm tall


ChalcociteUSAMontana, Silver Bow Co., Butte District, Butte, East Colusa Mine

Chalcocite ~16cm wide




ChalcociteUSAMontana, Silver Bow Co., Butte District, Butte, Steward Mine

Chalcocite 2.9cm wide




ChalcociteUSANew Jersey, Passaic Co., Little Falls Township, Houdaille Quarry (Consolidated Stone and Sand Company Quarry; Consolidated Quarry)

Chalcocite & Chrysocolla 7mm wide




ChalcociteUSANew Jersey, Somerset Co., Bridgewater Township, Chimney Rock Quarry (Houdaille Industries Quarry; The Bound Brook Quarry; Stavola Industries Quarry)

Chalcocite ~5cm wide
Chalcocite on Calcite 12.5cm wide


ChalcociteUSANew Mexico, Grant Co., Santa Rita District, Santa Rita, Chino Mine (Santa Rita Pit; Santa Rita Mine)

Chalcocite coating Pyrite 2cm
Chalcocite coating Pyrite 1.8cm


ChalcociteUSANew Mexico, Sandoval Co., San Pablo, Nacimiento Mine

Chalcocite after Wood ~17cm wide




ChalcociteUSANew Mexico, Torrance Co., Scholle, Abo Mine

Chalcocite after wood ~4cm wide




ChalcociteUSATexas, Clay Co.

Chalcocite after wood ~9cm wide




ChalcociteUSAWisconsin, Rusk Co., Ladysmith, Flambeau Mine

Chalcocite 5.5cm wide
Chalcocite 10cm wide


Chalcocite 5.5cm tall
Chalcocite 3.6cm tall


Chalcocite 2.7cm wide
Chalcocite 6.5cm


Chalcocite 9.8cm tall
Chalcocite 11.5cm tall


Chalcocite 5.5cm wide
Chalcocite 2.7cm wide


Chalcocite 3cm wide
Chalcocite 3.4cm wide






Click here to view Best Minerals C and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.

Rock Currier
Crystals not pistols.



Edited 20 time(s). Last edit at 08/24/2012 11:58AM by Ralph Bottrill.
avatar Re: Chalcocite
December 24, 2009 03:07AM
    
Chalcocite
Flambeau Mine,
Ladysmith, Wiscsonsin, USA
4.4cm across
Attachments:
open | download - DSCN0696a.JPG (527.6 KB)
avatar Re: Chalcocite
December 24, 2009 10:34AM
Ryan, I need you to upload the image to the mindat gallery and not just attach it to a thread posting. There are copyright considerations that must be addressed on the image upload page.

Rock Currier
Crystals not pistols.
avatar Re: Chalcocite
December 09, 2010 12:34AM
    
(1) Cornwall.

Chalcocite was very common in Cornish mines, but not everywhere well crystallized. The most famous localities are:

- Crenver and Wheal Abraham
- Botallack Mine
- Levant Mine
- St Ives Consols
- Tincroft Mine

Good ones also came from

- Dolcoath Mine
- Carn Brea Mine
- Cook's Kitchen Mine
- Geevor Mine
- various mines at Gwennap

There should be enough photos in the database, so we should only choose those with a proper locality given (not the generic "Redruth" specimens, which can originate from everywhere in the district, and also not those that are just labelled "Cornwall" - unless they are exceptional, of course). I also have another 30 Cornish specimens from well documented localities that are not yet photographed.

Habits are very variable, but there are were also all sorts of pseudomorphs occurring: bornite, djurleite, digenite, covellite and blister copper after chalcocite are known. Except for the blister copper pseudos, they often can't be conclusively identified by visual means only and thus, many specimens traded as chalcocites are actually another mineral. This happened to many djurleites from Geevor, Levant and Botallack, which were passed off as chalcocites before someone performed an analysis and found out what they really were. After this was known by local dealers, however, many specimens with a similar habit were traded as djurleites for exaggerated prices, although they were just chalcocites.

(2) M'Passa Mine, Congo:

Specimens from this mine are awesome, but very difficult to come by.

(3) Dzezkazghan:

Did also produce decent specimens, often in association with tennantite.
avatar Re: Chalcocite
December 09, 2010 02:21AM
I don't think I inserted that picture of the Wisconsin chalcocite in the lead position in the article. I don't think they got good enough for that distinction. I have replaced it with a Cornwall specimen and a Bristol Connecticut specimen that are much better. After I finish the Pseudomorph article, Ill turn my attention to Chalcocite. For the most part I would agree with you about giving priority to those specimens where the specific locality is known, but if the specimen is fine enough, Ill put it in even though its locality is only general.

Rock Currier
Crystals not pistols.
avatar Re: Chalcocite
December 09, 2010 05:49PM
    
The Wisconsin specimen may be altered to bornite. Irridescence with chalcocites is usually suspect.
WERI2011
Re: Chalcocite
January 04, 2011 11:46PM
Ikaite and Glendonite.





Edited 1 time(s). Last edit at 01/05/2011 02:07AM by Rock Currier.
Attachments:
open | download - IKAITE Glendonite.jpg (66.1 KB)
avatar Re: Chalcocite
January 05, 2011 02:10AM
WERI2011

Is the Ikaite a real Ikaite and of so where is it from and how large is it and what steps were taken to preserve it? Where is the glendonite and where is it from?

Rock Currier
Crystals not pistols.
avatar Re: Chalcocite
January 05, 2011 10:07AM
    
And, more importantly, in which way are they related to chalcocite ??
avatar Re: Chalcocite
January 05, 2011 11:13PM
Peter!, didn't you know that Ikaites were really chalcocite according to the latest nomenclature changes? I think they are now somewhere in the new pyrochlore group. Maybe I got that wrong, it is so hard to keep up with the latest changes.

Yes, he should have put his posting over in the Pseudomorphs A to C thread.

Rock Currier
Crystals not pistols.
avatar Re: Chalcocite
October 30, 2011 01:56PM
    
iridescence is what the Wisconsin chalcocite is famous for. it is actually a coating of bornite

-Rowan Lytle

Necessities:
Food, Water, Shelter, Fire, Minerals.
Re: Chalcocite
August 22, 2012 11:46PM
Rock,

Here's another chalcocite replacing wood from the Nacimiento Copper Mine, Sandoval County, New Mexico, USA.

Philip





Edited 1 time(s). Last edit at 08/23/2012 09:33AM by Jolyon Ralph.
Re: Chalcocite
August 23, 2012 12:12AM
    
Hello Rock,

Didn't know you had it in you, but your reply to Peter was brilliant. It sure put a smile on my face. Thanks
Re: Chalcocite
August 23, 2012 12:55AM
    
The Cananea district, and specifically the Capote Mine in Sonora, Mexico, have produced fine specimens of Chalcosite in the past. See http://www.mindat.org/photo-392081.html. John S.
Re: Chalcocite
August 23, 2012 07:21AM
One chalcocite locality that is missing is the Telfer gold mine in Western Australia. Produced some killer specimens, including sharp prisms as long as your finger, with excellent lustre. Sensation at Tucson several years back (2001?) with prices to match and illustrated on the front cover of Australian Journal of Mineralogy Vol. 12, No.1 (http://www.mineral.org.au/pubs/ajm.html). Unfortunately only one photo on Mindat, and I don't have any to add.
Cheers,

Ben.
avatar Re: Chalcocite
August 23, 2012 12:56PM
Good point Ben, I just attached one photo, but more are welcome of these world class chalcocites.

Regards,
Ralph
avatar Re: Chalcocite
August 24, 2012 05:12AM
Philip,
Thats quite interesting. Ill put it into the article when I get a chance.

Rock Currier
Crystals not pistols.
avatar Re: Chalcocite
August 24, 2012 05:14AM
Very nice. Ill put it in the article when I get the chance.

Rock Currier
Crystals not pistols.
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