Re: How many different habits of chalcocite twins are there?

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How many different habits of chalcocite twins are there?

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Ru Smith

Joined: 13 Oct 2012
Posts: 362

Posted: Jul 02, 2013 21:59 Post subject: How many different habits of chalcocite twins are there?

This one is quite unusual.

Chalcocite twin 1.jpg

Description:

Chalcocite.
Dzhezkazgan Mine, Dzhezkazkan, Karagandy Province, Kazakhstan.
12 mm twin on 3 cm matrix.

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12999 Time(s)

GneissWare

Joined: 07 Mar 2008
Posts: 1287
Location: California

Posted: Jul 02, 2013 23:49 Post subject: Re: How many different habits of chalcocite twins are there?

You are correct. This mine produces very strange chalcocite crystals. Here is another example (no closeups but same basic form).

GW001207.JPG

Description:

Chalcocite
Dzhezkazgan Mine, Dzhezkazgan, Qaraghandy Oblysy, Kazakhstan
151 x 113 x 64 mm
up to 16 mm Chalcocite crystals

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12976 Time(s)

Ru Smith

Joined: 13 Oct 2012
Posts: 362

Posted: Jul 27, 2013 12:43 Post subject: Re: How many different habits of chalcocite twins are there?

Impressive specimen, GneissWare. Here's a more conventional tabular pseudohexagonal twin.

Kazakh Chalcocite 1.jpg

Description:

Chalcocite twin.
Dzhezkazgan Mine, Dzhezkazkag, Karagandy Province, Kazakhstan.
8 mm twin.

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12733 Time(s)

Kazakh Chalcocite 2.jpg

Description:

Chalcocite twin.
Dzhezkazgan Mine, Dzhezkazkag, Karagandy Province, Kazakhstan.
8 mm twin.

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12758 Time(s)

GneissWare

Joined: 07 Mar 2008
Posts: 1287
Location: California

Posted: Jul 27, 2013 16:08 Post subject: Re: How many different habits of chalcocite twins are there?

It still looks a bit blocky compared to other localities. Nice crystal.

Ru Smith

Joined: 13 Oct 2012
Posts: 362

Posted: Aug 10, 2013 11:24 Post subject: Re: How many different habits of chalcocite twins are there?

A Cornish example.

Chalcocite Geevor.jpg

Description:

Chalcocite.
Geevor Mine, Cornwall, England, UK.
18 mm specimen.

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12510 Time(s)

Ru Smith

Joined: 13 Oct 2012
Posts: 362

Posted: Aug 25, 2013 21:38 Post subject: Re: How many different habits of chalcocite twins are there?

just another little Cornish specimen.

Chalcocite Redruth.jpg

Description:

Chalcocite twins.
Redruth, Cornwall, England, UK.
11 mm.

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12268 Time(s)

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