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A general guide for using the Forum with some rules and tips
Help with identification of rock/mineral
  
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Mineralien




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PostPosted: Oct 22, 2017 08:21    Post subject: Help with identification of rock/mineral  

I am wholly new to minerology and would like some help in identifying this mineral to begin my learning. The stone is white with a pink tinge and has a a glassy appearance, especially under a light.Very hard structure. The two attached phoots are of the same rock from different sides. I imagine the white mineral is very common (to those with the knowledge)with some deposits of other minerals that give it the pinkish brownish colour throughout which can be seen to be stronger in some cracks/lines.

Hope this is enough for you experts to make a rough analysis. Thanks.

Duane



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Vinoterapia




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PostPosted: Oct 22, 2017 08:40    Post subject: Re: Help with identification of rock/mineral  

It looks like a piece of quartz from a vein. The reddish colors are probably iron oxide staining along fractures.
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Mineralien




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PostPosted: Oct 22, 2017 13:21    Post subject: Re: Help with identification of rock/mineral  

Thanks! What do you mean when you say the piece is from a vein?
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Matt_Zukowski
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PostPosted: Oct 22, 2017 15:53    Post subject: Re: Help with identification of rock/mineral  

The "blockiness" suggests to me feldspar, but as always it is really hard to tell from just a photograph. It could be quartz too. You ask what a vein is - i suggest you just google the word "vein." If you really want to know what this is, I suggest you read "What is this? / Where is it from?" so you can provide the info needed for an ID.
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Vinoterapia




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PostPosted: Oct 22, 2017 16:26    Post subject: Re: Help with identification of rock/mineral  

Since your location (Avila) is probably in Spain, the spanish term for vein would be "veta".

And as Matt suggested, it could be a feldspar instead of quartz, but you can probably make some tests to provide more information.
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Mineralien




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PostPosted: Oct 22, 2017 16:45    Post subject: Re: Help with identification of rock/mineral  

Hello,

Hahahah..sorry, my question is what a vein is in relation to rocks and minerals.Quartz from a vein of what? I¡'m actually English and living in Spain.

Thanks for the further information - I'm going to look for methods to test which one it is.

Duane
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Pete Modreski
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PostPosted: Oct 23, 2017 13:33    Post subject: Re: Help with identification of rock/mineral  

Dear Duane/Mineralien,

Although feldspar is distinguished by having good cleavage that causes it to break along flat surfaces, quartz can also sometimes break in a "blocky" pattern, like this specimen. And, I would say that quartz is more likely to have this type of hematite (iron)-stained fractures, as you see here. From its overall appearnace I would judge that the specimen is most likely, milky quartz.

So, you can look up some definitions and explanations of what a vein is. A vein is a term for a texture or structure that one finds in a rock. It is formed by mineral-bearing water percolating along an open fracture in rock, and depositing minerals within that fracture. Hence, the "country rock" or "host rock" that surrounds the vein will be some type of pre-existing ROCK. But the material deposited in the vein, which makes up the vein, will be one mineral or a mixture of MINERALS; for example, it may be quartz alone, or calcite, or quartz + pyrite, or quartz + gold, or quartz + pyrite + galena + sphalerite, and so on. If one simply has a piece of one solid mineral--like your piece of (presumably) quartz, you really can't tell anything else about what sort of a mineral vein it might have come from.
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