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17 Aug-23:45:47 Re: tremolite-actinolite skarn with diverse crystals (Kara)
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17 Aug-19:29:21 What is this ? (Paulmccabe1188)
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17 Aug-14:00:40 Mindat is in financial trouble.....!?! (Peter Lemkin)
17 Aug-12:53:46 Re: tremolite-actinolite skarn with diverse crystals (Peter Lemkin)
17 Aug-11:00:17 Re: tremolite-actinolite skarn with diverse crystals (Kara)
17 Aug-10:03:39 Re: enargite triplets (Pete Richards)
17 Aug-09:35:01 Re: tremolite-actinolite skarn with diverse crystals (Peter Lemkin)
17 Aug-09:30:53 Re: tremolite-actinolite skarn with diverse crystals (Pete Richards)
17 Aug-09:18:59 Re: "deep sea manganese nodule".... (Peter Lemkin)
17 Aug-08:07:09 Re: could anyone identify this stone? (Procol)
17 Aug-07:58:40 Re: could anyone identify this stone? (Vic Rzonca)
17 Aug-07:42:29 Re: could anyone identify this stone? (Procol)
17 Aug-07:41:55 Re: could anyone identify this stone? (Gail)
17 Aug-07:35:48 Re: could anyone identify this stone? (Josele)
17 Aug-07:28:51 Re: could anyone identify this stone? (Procol)
17 Aug-07:21:37 Re: micro photos of inclusions in quartz (Zbhjzm)

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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:  584 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:  588 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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