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26 May-00:06:47 Re: collection of fiebre verde (Franjungle)
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25 May-20:21:13 Re: please identify - rock with white inclusions (Foreman)
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25 May-18:39:19 The mizunaka collection - quartz (Am Mizunaka)
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24 May-06:25:09 Re: new mexico collecting - (27) (Chris Rayburn)
24 May-03:12:51 The mizunaka collection - rhodochrosite (Am Mizunaka)
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23 May-22:35:53 Re: new mexico collecting - (27) (Philip Simmons)
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23 May-16:42:22 Re: please help identify (Southernappalachian)
23 May-16:02:44 Re: please help identify (Kevin Schofield)
23 May-15:26:40 Please help identify (Southernappalachian)
23 May-14:41:14 Re: the mizunaka collection - quartz (Am Mizunaka)
23 May-10:24:44 Re: collection of dontgogreen (Dontgogreen)
23 May-03:52:50 Re: the mizunaka collection - quartz (Pierre Joubert)
23 May-00:54:59 Re: please identify - rock with white inclusions (Foreman)

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The quality of this stone (2)
  
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Hook111111




Joined: 21 Apr 2018
Posts: 12
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:  317 Time(s)

٢٠١٨٠٤١٨_١٠٤٩٥٧.jpg


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Hook111111




Joined: 21 Apr 2018
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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:  315 Time(s)

٢٠١٨٠٤١٨_١٠٥٠١٧.jpg


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Kevin Schofield




Joined: 05 Jan 2018
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Location: Houston TX

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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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