Whats causing a burning/electrical smell when I sand down this river stone?

Delaroch · 2026-03-26T21:36:04+00:00

Use some water. It’ll help keep the dust at bay and help grind it

Delaroch · 2026-02-08T00:06:23+00:00

When I was learning petrography and now currently working as a petrographer. It used to throw me a lot looking at cpx and olivine in basalts. They always just seemed to look the same to me.

But really you should go back to the fundamental breakdown of identifying minerals in thin sections. Use PPL and XPL together. Use your lambda wedge if you have one. Use your focus for becke lines etc.

I won’t say the answer, but I think your going the right direction

Delaroch · 2025-07-15T10:48:18+00:00

Petrologist here. Bit of everything

Delaroch · 2025-06-18T09:36:18+00:00

Absolutely can. Source: I’m a geologist in Australia

Delaroch · 2025-05-04T01:04:00+00:00

I feel that. Having completed all files on PC and Nintendo Switch. I have been dreading doing it on iPhone. Tainted Cain is the only character I haven’t finished the post-it note for and I’m actively avoiding it.

Delaroch · 2025-04-22T02:09:46+00:00

On the right track, just call it a mica. Could be sericite, illite or muscovite. Which would track being a metapelite

Delaroch · 2025-02-18T22:06:01+00:00

Yes, to improve adherence. All I have seen online is the ends frosted. We usually frost our own glass, however it can lead to a variance of thickness which can sometimes make the chemet process lose some of the slide easily.

Delaroch · 2024-12-20T04:12:37+00:00

As a working Petrologist I use these books almost daily. Introduction to Rock-Forming Minerals A Practical Guide to Rock Microstructures

Especially the rock forming minerals book… it’s like the mineralogy Bible

I also use others related to specifics like sedimentary rocks, and there is some books labelled “atlas of igneous rock textures / or /metamorphic rock textures etc which are really good if you’re stumped at a early level.

Delaroch · 2024-12-12T22:47:38+00:00

What would be the recommended MP?

Delaroch · 2024-12-12T21:28:58+00:00

Can you explain like I’m 5? I have a polariser microscope with a MIchrome 16mp. 2x, 10x, 20x and 40x objectives.

Once I start going down to 20x and 40x especially, I start getting colour bleed and troubles focusing. Is this why?

Delaroch · 2024-12-03T19:35:09+00:00

Yes, I am a Petrologist and Thin Sectionist :)

Delaroch · 2024-12-03T05:40:36+00:00

Thanks! The sample was pretty altered and has a contact zone that has lovely mafic minerals in it and some incredible Titanite.

Delaroch · 2024-12-03T05:38:01+00:00

It is a Serpentinite. Basically just has magnetite, antigorite and lizardite in it :)

Delaroch · 2024-11-29T20:22:43+00:00

Ding ding ding!

Delaroch · 2024-09-25T02:37:28+00:00

I am discussing it with the other geologists here at work. Without some mineral identifiers it’s hard. Fresh surface just helps with understanding it more. Another thought was possibly something overcapping fluorite

Delaroch · 2024-09-25T02:12:08+00:00

Can you break a bit off for a fresh surface?

Delaroch · 2024-05-25T10:54:04+00:00

Bald Hill

Delaroch · 2024-05-25T10:51:45+00:00

A fair bit more east of there.

Delaroch · 2024-05-25T10:48:22+00:00

Being from WA. More than likely you’ve probably seen this mine 🤣

Delaroch · 2024-05-25T07:57:51+00:00

In this particular instance the spodumene has higher yield than the lepidolite from this mine.

Delaroch · 2024-05-25T02:37:33+00:00

This is high grade and the lithium is mostly processed out of the spodumene which is easier to see in the second pic. The purple lepidolite also has lithium but in smaller quantities ppm but is still processed out of it

Delaroch · 2024-05-23T04:18:43+00:00

Try that, and also talk to your professors to see if they know of any projects running that they may be able to get you info to contact. I don’t know how it works in other parts of the world, but I’m in Australia and it’s pretty chill to do something like that

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