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What is this brown iron coloured material on these quartz?
  
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Anika-McAlpine




Joined: 29 May 2019
Posts: 1
Location: Waterloo

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PostPosted: May 30, 2019 16:20    Post subject: What is this brown iron coloured material on these quartz?  

I recently went out and found quite a few pieces of quartz. Some of them however, have this brown iron, almost rust colour on them. When wet, I can easily remove the brown material from the quartz with either a hard brush or a metal wire. Yet, with all my scrubbing, most of it still remains on the quartz. Does anyone know what it is and how best to remove it? Also, the quartz in this brown material looks to me to have grown unusually, almost block like as opposed to the points usually seen in quartz. Why did the brown material cause the quartz to grow this way and what caused the brown material in the first place? I have attached a few pictures of two of the more interesting pieces that I found.

Thanks for the help!

Anika



20012268-0DF1-4955-8AA4-E865EF78E64B.jpeg
 Mineral: Quartz
 Description:
River valley, Ontario Canada
7cm
 Viewed:  686 Time(s)

20012268-0DF1-4955-8AA4-E865EF78E64B.jpeg



C798C03C-B181-48FF-883F-04D52945E65B.jpeg
 Mineral: Quartz
 Description:
River valley, Ontario Canada
7cm
 Viewed:  679 Time(s)

C798C03C-B181-48FF-883F-04D52945E65B.jpeg



C7A308BF-4A5D-4235-9946-ECB6F2401BF8.jpeg
 Mineral: Quartz
 Description:
River valley, Ontario Canada
7cm
 Viewed:  678 Time(s)

C7A308BF-4A5D-4235-9946-ECB6F2401BF8.jpeg



F21DAACD-087F-40DF-A946-D82C590DEBD3.jpeg
 Mineral: Quartz
 Description:
River valley, Ontario Canada
7cm
 Viewed:  679 Time(s)

F21DAACD-087F-40DF-A946-D82C590DEBD3.jpeg



01A02D83-0F35-4948-99C1-4A9F18F06ABA.jpeg
 Mineral: Quartz
 Description:
River valley, Ontario Canada
5 cm
 Viewed:  680 Time(s)

01A02D83-0F35-4948-99C1-4A9F18F06ABA.jpeg



963AD7FF-659E-4C92-B66A-E1BE511E85CC.jpeg
 Mineral: Quartz
 Description:
River valley, Ontario Canada
7cm
 Viewed:  682 Time(s)

963AD7FF-659E-4C92-B66A-E1BE511E85CC.jpeg



9C7E2CA1-FA04-4385-9392-7C89D6F940EF.jpeg
 Mineral: Quartz
 Description:
River valley, Ontario Canada
7cm
 Viewed:  688 Time(s)

9C7E2CA1-FA04-4385-9392-7C89D6F940EF.jpeg


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kushmeja




Joined: 28 Jul 2014
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Location: New Jersey

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PostPosted: May 30, 2019 16:29    Post subject: Re: What is this brown iron coloured material on these quartz?  

The brown mineral is most likely Limonite. It probably formed as a result of decomposition of another mineral that was previously there, which is why you see the cavities in the Quartz from where the former mineral was prior to it breaking down into the Limonite.

If you wish to remove the Limonite, your best bet would probably be to use Super Iron Out or something similar, which causes the iron to be more soluble and dissolve into the solution. You would need to soak the specimen in SIO for a few hours and then either scrub away the remnants or use a water spray gun to blast it away. It shouldn't harm the Quartz whatsoever, because Quartz is quite stable and hard.
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Bob Harman




Joined: 06 Nov 2015
Posts: 608
Location: Indiana


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PostPosted: May 30, 2019 16:45    Post subject: Re: What is this brown iron coloured material on these quartz?  

As Kushmeja said. Limonite is the older inclusive term for a mixture of rusty iron oxides.

Virtually all non-fresh out of the matrix mineral specimens, such as yours, have some areas of these rusty iron oxides.

They can be removed or lessened with rust removers such as Iron Out. It is important to note that, after Iron Out use, soak the example in a water/baking soda solution for a couple of hours to prevent a chemical reaction from the rust remover which may leave a yellowish green coating on your specimen. Then finally rinse, or hi pressure rinse the specimen off really thoroughly.

Hope this helps, Bob
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