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A new find: Hoganite from Morocco
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James Catmur
Site Admin

Joined: 14 Sep 2006
Posts: 1482
Location: Cambridge

Posted: Feb 28, 2018 10:43 Post subject: Re: A new find: Hoganite from Morocco

Could you repeat your experiment using this recipe?

Cesar M. Salvan wrote:

For example, a classic recipe for preparation of copper acetate crystals use a mixture or table salt and vinegar to facilitate the corrosion of copper.

Manuel Mesa

Joined: 23 Dec 2011
Posts: 166
Location: Teruel

Posted: Feb 28, 2018 12:33 Post subject: Re: A new find: Hoganite from Morocco

alfredo wrote:

The next thing we need to find out is whether the malachite is older or younger than the hoganite. If older, it could be that there was once more malachite and it has been partly etched away by acetic acid. If younger, it's possible that the malachite is a product of alteration of hoganite. Close up photos of the contact between the two species might help. Even if perhaps the hoganite was really the product of reaction with natural wood-derived acetic acid in the mine, the association with malachite is still problematic and needs some explaining.

Alfredo,

I attached the photo you asked

malachite-hoganite.jpg

Mineral:

Malachite and hoganite

Locality:

Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region, Morocco

Description:

Photo: Joy Desor

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31485 Time(s)

alfredo
Site Admin

Joined: 30 Jan 2008
Posts: 1014

Posted: Feb 28, 2018 12:52 Post subject: Re: A new find: Hoganite from Morocco

Thanks, Manuel - beautiful photo. Meanwhile, Cesar has explained that acetates and carbonates commonly coexist with each other, so I no longer see a problem with this.

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