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2000 Views 2 Replies Last post: Feb 21, 2011 4:14 PM by francis RSS
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Apr 20, 2011 2:13 PM

Answered as far as possible - Sinai rocks

My Bedouin friend in South Sinai would like to know what these rocks are.

Can anyone help, please?

 

Francis

 

Message was edited by: Luanne

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    Feb 21, 2011 2:24 PM (in response to francis)
    Re: Sinai rocks

    Hi Francis,

     

    The first photo shows cubic crystals that I think could be goethite ((FeO(OH)) replacements of cubic iron pryite crystals (called goethite pseudomorphs after pyrite) or else a superficial coating of goethite upon pyrite (FeS2) crystals. I've attached a fact sheet that gives more information about pyrite. Cubic pyrite crystals are common and often become replaced or coated by by goethite.

     

    The second photo also possibly shows some kind of iron oxide, hydroxide or sulphide ore.

     

    The third photo most likely shows a purple variety of quartz that could be termed amethyst (although this term is sometimes reserved for purple quartz of higher quality).

     

    It's very difficult to identify minerals from photos alone as so much information such as the hardness, density, streak is lost and even visual information such as tiny mineral faces and cleavage are hard to discern. Please do pipe up if you have any other suggestions! Hope this helps a bit.

     

    Luanne

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