DR. HANNEMAN'S MINERAL COLLECTION WILL BE AVAILABLE FOR SALE IN THE NEAR FUTURE
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 Post subject: New (final) scope, new photos
PostPosted: Thu Nov 12, 2020 12:13 am 
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Hi everyone,
Well, I've been futzing with my equipment for a bit, and I think I've got my final scope assembled.

Long story short it's assembled from different Nikon parts (some sold under other brands), along with mitutoyo metallurgical objectives. It's much the same as my last one, except some optical imcompatibilities were bringing it down before but now everything is running smoothly.
My first test subjects have been various inclusions in some unheated Madagascan sapphires I got a while back. Click to see full size.
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Apatites!
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Rutile!
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Uh....something!
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A view from an airplane looking down at city lights through the clouds? Nope, it's rutile again!
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That's no moon (it's probably a sulfide).

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 Post subject: Re: New (final) scope, new photos
PostPosted: Thu Nov 12, 2020 1:44 pm 
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What great pics.
Do you always use the same camera for your shots?


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 Post subject: Re: New (final) scope, new photos
PostPosted: Fri Nov 13, 2020 7:22 pm 
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Thanks! Yup, I've been using a Canon T6 for a while now. It does everything I need it to.
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Hmm, what's this, abalone with blister pearls? Not quite.
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That's right, these are those flat black inclusions you see in Tibetan 'diamond' quartz. These are usually referred to as anthraxolite (amorphous carbon) because that's what's in Herkimer diamonds, but that doesn't appear to be the case here. A few of these flakes are pleochroic, ranging from green to deep orange-red between crossed polars (the quartz itself providing the bottom polarizer)
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That suggests these started out as crystals, perhaps of biotite, which formed on the surface of the quartz as it was growing and were then heavily oxidized, rendering most of them into amorphous, leathery iron oxides/hydroxides. This is further reinforced by the appearance of flowing, swirling Liesegang banding in transmitted light:
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The surface texture is also wacky:
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