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17 Aug-08:59:57 Re: help identification (Michael Shaw)
17 Aug-07:38:03 Re: help identification (Fjbonfante)
17 Aug-07:36:30 Re: help identification (Fjbonfante)
17 Aug-05:14:52 Re: help identification (James Catmur)
17 Aug-00:22:28 Re: collection of volkmar stingl (Volkmar Stingl)
16 Aug-21:14:26 Re: quartz japan twin (Bob Carnein)
16 Aug-20:51:42 Re: quartz japan twin (Bob Morgan)
16 Aug-15:34:01 Re: help identification (Alfredo)
16 Aug-13:40:44 Quartz japan twin (Marco Campos-venuti)
16 Aug-13:04:01 Help identification (Fjbonfante)
16 Aug-12:18:43 Re: collection from dany mabillard (Dany Mabillard)
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16 Aug-05:18:59 Re: peridot on lapis ??? (Origin Gems)
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16 Aug-04:30:00 Re: peridot on lapis ??? (Marco Campos-venuti)
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Help identification
  
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Fjbonfante




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PostPosted: Aug 16, 2025 13:04    Post subject: Help identification  
Hello everyone. I'm starting out in this wonderful world and I still don't have all the knowledge. I would like some help. I recently found this material in the state of Paraná, Brazil. It scratches quartz... what could it be?

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alfredo
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PostPosted: Aug 16, 2025 15:34    Post subject: Re: Help identification  
What is the color of the powder when you rub it on a piece of broken porcelain?
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James Catmur
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PostPosted: Aug 17, 2025 05:14    Post subject: Re: Help identification  
Please take a photo of it on white plain paper, that way the camera focuses on the specimen, not the background
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Fjbonfante




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PostPosted: Aug 17, 2025 07:36    Post subject: Re: Help identification  
slightly reddish brown

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Fjbonfante




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PostPosted: Aug 17, 2025 07:38    Post subject: Re: Help identification  
melhor

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Michael Shaw
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PostPosted: Aug 17, 2025 08:59    Post subject: Re: Help identification  
A reddish-brown streak suggests hematite, but the hardness test, if accurate, makes no sense. The hardness of hematite is 5 - 6, so it wouldn't scratch quartz. Try the hardness test again using the quartz to scratch the unknown mineral.
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