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04 Aug-10:08:28 Re: tsumeb zincolivenite association - light blue acicular mineral = ? (Peter Megaw)
04 Aug-08:27:23 Tsumeb zincolivenite association - light blue acicular mineral = ? (Cfrench58)
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03 Aug-14:18:07 Re: tsumeb - deposit of dioptase on calcite. (Roger Warin)

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Magnetic serpentine?
  
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Ken




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PostPosted: May 07, 2021 21:45    Post subject: Magnetic serpentine?  

These stones all have a hardness of about 3.5 so I think they are serpentine. That last stone has a very odd shape, took me a while to figure it out. I've read that the magnetism is caused by magnetite but I can't see anything black in these stones so could it be hematite?


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alfredo
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PostPosted: May 08, 2021 02:15    Post subject: Re: Magnetic serpentine?  

Riverside county has lots of metamorphic rocks with magnetite in them. I've seen many in the San Gorgonio Pass - Palm Springs area. The soft part might be mica or chlorite rather than serpentine. Usually if a dark rock is magnetic, the reason is magnetite inclusions - Other magnetic minerals are possible too but much less common.
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Ken




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PostPosted: May 09, 2021 23:10    Post subject: Re: Magnetic serpentine?  

You're right about there being a lot of magnetite in that area, I do recall seeing a good deal of it around there. Thanx for the reply.
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