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Is this feldspar
  
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tompasha




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PostPosted: Sep 04, 2020 07:19    Post subject: Is this feldspar  

Hi,

Please can someone confirm (or not) if this sample is a feldspar?
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tompasha




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PostPosted: Sep 04, 2020 08:03    Post subject: Is this feldspar  

Hi,

Could someone help me identify this please?






It has a strong rainbow effect and I wonder if it is a kind of feldspar, such as rainbow lattice, however the rainbow effect is not a lattice.



118809105_345672276470648_8451946132751991181_n.jpg
 Mineral: Feldspar
 Description:
Locality: Belmonte
Size: 5 cm
 Viewed:  873 Time(s)

118809105_345672276470648_8451946132751991181_n.jpg


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SteveB




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PostPosted: Sep 04, 2020 08:18    Post subject: Re: Rainbow lattice  

Try reading the sticky post on identifying first so run some tests yourself. That looks like a surface coating on quartz since its a useless source for anyone to help you. First help yourself and follow the guidelines posted to prevent useless posts like this. No reason to try to help if you won't make an effort yourself.
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James Catmur
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PostPosted: Sep 04, 2020 10:59    Post subject: Re: Rainbow lattice  

Please follow these guidelines - with more tests we might be able to help.

https://www.mineral-forum.com/message-board/viewtopic.php?p=19487#19487
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tompasha




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PostPosted: Sep 04, 2020 11:32    Post subject: Re: Rainbow lattice  

OK. actually i had read all your guidelines about running tests. As I had exhausted all of them, I decided to seek help here. Also, I work with the local geologists here, but they seem to identify everything with a shine as being quartz. It's a dead end, as my understanding is that feldspar is equally abundant as quartz on the planet, but all i get from geologists is "feldspar is opaque" and I check it out and lots of feldspar is NOT opaque but translucent.

There is a huge pile 60 metres X 10 metres X 3 metres deep of rocks. Some of them are definitely rose quartz, but others have a more peachy colour and look different. Others are white but with black tourmaline inclusions like this piece. It looks to me as though they have feldspar cleavage.

I would expect in a pegamatite in a granite region to find some quartz and some feldspars. There are literally hundreds of abandoned mines from the 40s where all they wanted was wolframite which was worth loads of money and this region is famous for it. So all the other rocks got left behind.



118541786_425609138411509_7795170577370443021_n.jpg
 Mineral: Feldspar
 Description:
Locality: Belmonte
Size: 4 cm
 Viewed:  802 Time(s)

118541786_425609138411509_7795170577370443021_n.jpg


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tompasha




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PostPosted: Sep 04, 2020 11:34    Post subject: Re: Rainbow lattice  

Here is another piece of the same.


118786470_440589496919204_2594385109769341722_n.jpg
 Mineral: Feldspar
 Description:
Locality: Belmonte
Size: 7 cm
 Viewed:  798 Time(s)

118786470_440589496919204_2594385109769341722_n.jpg


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James Catmur
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PostPosted: Sep 04, 2020 12:40    Post subject: Re: Rainbow lattice  

Can we see the results of your tests, please. Otherwise we will just say 'Quartz'
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James Catmur
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PostPosted: Sep 04, 2020 12:58    Post subject: Re: Rainbow lattice  

Which mine is it from? I never collected near Castello Branco (my last visit must have been in about 1992), but others may have
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tompasha




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PostPosted: Sep 04, 2020 13:21    Post subject: Re: Rainbow lattice  

I live in Castelo Branco. i know the area, but there are hundreds of small unclassified mines all over.

These stones come from near Penamacor but dont know the name of the mine I was told about it from a forestry engineer. He said it was private. It is way up in the hills. I can arrange some pictures.

I go a lot to Bendada and the Vila Velha region. My favourite place is Argemela where I made a turquoise discovery. This region is loaded with interesting minerals like Bendadaite from Bendada.

The last photo is a feldspar in your opinion? It seems to me it has that cleavage.
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James Catmur
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PostPosted: Sep 04, 2020 13:51    Post subject: Re: Rainbow lattice  

Bem

Hardness?

Density?

Streak?

I will not give an opinion without data, sorry. So far it is Quartz unless data says otherwise

Penamacor suggests it could possibly be Baryte, so check the density and hardness

https://www.mindat.org/loc-189990.html

Tipos: Ocorrências de Zinco e Chumbo, independentes da actividade ígnea, filões
Descrição: filões quartzosos orientados ENE-WSW
Mineralizações principais: Blenda, Galena
Morfologias: filão
Rochas encaixantes: granitos, xistos
Geologia local: Complexo Xisto-grauváquico. Granitos monzoníticos porfiróides
Geologia regional: Câmbrico. Granitos tardi a pós-F3
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Pete Richards
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PostPosted: Sep 04, 2020 13:58    Post subject: Re: Is this a feldspar?  

Looks more like quartz to me. Check for cleavages - feldspar has good cleavage and quartz does not.
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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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