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03 Jun-06:16:31 Re: collection of volkmar stingl (Volkmar Stingl)
02 Jun-13:39:20 Re: don lum collection (Don Lum)
02 Jun-08:51:39 Re: collection of michael shaw (Michael Shaw)
02 Jun-02:27:53 The mizunaka collection - rhodchrosite (Am Mizunaka)
02 Jun-01:36:07 Re: collection of volkmar stingl (Volkmar Stingl)
02 Jun-01:17:41 Re: is this a rhyolite matrix with calcite and smoky quartz? (Volkmar Stingl)
01 Jun-22:11:04 Re: is this a rhyolite matrix with calcite and smoky quartz? (Roger Warin)
01 Jun-20:02:10 Re: is it possible for this specimen of hyalite to be associated with other minerals? (Alfredo)
01 Jun-10:24:08 Re: is it possible for this specimen of hyalite to be associated with other minerals? (Rick Roan)
01 Jun-10:21:30 Is malachite rare? (Matt_zukowski)
01 Jun-09:51:59 Re: is it possible for this specimen of hyalite to be associated with other minerals? (Matt_zukowski)
01 Jun-09:21:32 Re: is it possible for this specimen of hyalite to be associated with other minerals? (Rick Roan)
01 Jun-07:40:50 Re: mineral identification tips (Cascaillou)
31 May-16:04:59 Is this a rhyolite matrix with calcite and smoky quartz? (Gk68)
31 May-15:40:58 Re: don lum collection (Don Lum)
31 May-15:40:12 Re: is this dolomite-pyrite-siderite? (Gk68)
31 May-09:28:53 Re: is it possible for this specimen of hyalite to be associated with other minerals? (Rick Roan)
31 May-08:49:08 Re: is it possible for this specimen of hyalite to be associated with other minerals? (Alfredo)
31 May-07:33:18 Re: is it possible for this specimen of hyalite to be associated with other minerals? (Rick Roan)
31 May-07:26:07 Re: is it possible for this specimen of hyalite to be associated with other minerals? (James Catmur)
31 May-06:33:57 Is it possible for this specimen of hyalite to be associated with other minerals? (Rick Roan)
30 May-22:57:14 Re: collection of volkmar stingl (Volkmar Stingl)
30 May-09:49:21 Re: provide miller indices in practice please (Robson Vieira)
30 May-09:47:37 Re: provide miller indices in practice please (Robson Vieira)
29 May-22:39:04 Re: collection of volkmar stingl (Volkmar Stingl)

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The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
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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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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