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The quality of this stone (2)
  
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Hook111111




Joined: 21 Apr 2018
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Location: Oman

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PostPosted: Apr 22, 2018 01:57    Post subject: The quality of this stone (2)  

The quality of this stone


٢٠١٨٠٤١٨_١٠٤٩٥٧.jpg
 Locality:
Ar Ruwais (Ar-Ruwais), Al Mintaqa (Al-Mintaqa), Al Gharbia (Al-Gharbyya), Abu Dhabi
 Dimensions: 10×6
 Description:
 Viewed:  586 Time(s)

٢٠١٨٠٤١٨_١٠٤٩٥٧.jpg


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Hook111111




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PostPosted: Apr 22, 2018 02:00    Post subject: Re: The quality of this stone  

Yas


٢٠١٨٠٤١٨_١٠٥٠١٧.jpg
 Mineral: Stone
 Locality:
Ar Ruwais (Ar-Ruwais), Al Mintaqa (Al-Mintaqa), Al Gharbia (Al-Gharbyya), Abu Dhabi
 Dimensions: 10×6
 Description:
 Viewed:  591 Time(s)

٢٠١٨٠٤١٨_١٠٥٠١٧.jpg


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Kevin Schofield




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PostPosted: Apr 22, 2018 09:24    Post subject: Re: The quality of this stone (2)  

This is a piece of chert, or cryptocrystalline quartz. Might also be referred to as "flint". Most diagnostic feature is the way it fractures (conchoidal, or shell-like).

The "feathery" black markings in your second photograph are arborescent or dendritic ("tree-like") growths of manganese oxide. These form when water penetrates small fractures in the rock and the mineral deposits on the walls of the fracture.

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