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Any ideas on the material appreciated
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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NZMatt




Joined: 25 Dec 2021
Posts: 1
Location: Auckland

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PostPosted: Dec 28, 2021 02:57    Post subject: Any ideas on the material appreciated  

Hi Matt from New Zealand here.

I'm looking for any ideas on what this mask is made from.

It has
- metallic deposits on the surface (colour of these varies between silver - gold)
- is quite mottled in colour - green through to opaque
- quite fractured
- soft feeling (no idea as to Mohs)
- chalks over reasonably quickly after coming into contact with water

For scale - the mask itself is approx 25cm tall

I've taken some close up of the deposits (these are quite sparkly which doesn't really show in the pics

As mentioned - any ideas appreciated :-)



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 Description:
Auckland
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 Description:
Auckland
25cm x 15cm
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SteveB




Joined: 12 Oct 2015
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Location: Canberra

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PostPosted: Dec 28, 2021 03:56    Post subject: Re: Stone Mask - Any ideas on the material appreciated  

Start with https://www.mineral-forum.com/message-board/viewtopic.php?p=19487#19487
, second this is a shaped item not a mineral specimen and as such not suitable for this forum, its likely a common tourist trinket material easy for anyone to figure out if they had read and followed forum rules and guides first instead of just expecting answers without effort.
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Sante Celiberti




Joined: 04 Oct 2019
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Location: Tuscany


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PostPosted: Dec 28, 2021 06:27    Post subject: Re: Stone Mask - Any ideas on the material appreciated  

Hi, Matt. Welcome to the Forum.

If you can dent it with your fingernail, it is Gypsum.
If it produces effervescence with a drop of vinegar, it is Calcite.
(Do the two tests on the back of the mask).
The golden inclusions are most likely Pyrite.
And next time, please, follow Steve's directions. :-)

Best wishes.
Sante
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Firmo Espinar




Joined: 05 Apr 2017
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Location: Medellín, Colombia.


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PostPosted: Dec 28, 2021 08:04    Post subject: Re: Stone Mask - Any ideas on the material appreciated  

Hi Matt,

when something looks like gold or silver it’s usually pyrite.

Regards.
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alfredo
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Joined: 30 Jan 2008
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PostPosted: Dec 29, 2021 12:47    Post subject: Re: Any ideas on the material appreciated  

Looks to me more like talc or serpentine, rather than gypsum.
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Volkmar Stingl




Joined: 23 Sep 2012
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PostPosted: Dec 29, 2021 12:52    Post subject: Re: Any ideas on the material appreciated  

alfredo wrote:
Looks to me more like talc or serpentine, rather than gypsum.


I agree.
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Riccardo Modanesi




Joined: 07 Nov 2011
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Location: Milano

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PostPosted: Dec 29, 2021 13:07    Post subject: Re: Any ideas on the material appreciated  

Hi to everybody!
If you can cut it perfectly with a common knife and it feels soapy on your finger, it's talc; if it has different characters, it might be gypsum. Gypsum is also cut by a knife, but it's much harder to do it.
Greetings from Italy by Riccardo,

_________________
Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
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