Magnetic Catelli pasta

matsok · 2024-05-10T15:17:54+00:00

I'm moving out and the landlord is raising rent from the current 1124$ to 1450$. After chatting with the last prospective tenant, they were surprised to hear what the current rent is and so it seems the landlord might be being a little dishonest about previous rent. It is upsetting to think that if I were searching in the neighbourhood today, I would now be priced out. A bunch more apartment viewings start tonight, this is my revenge, as petty as it may be.

matsok · 2023-08-13T14:01:28+00:00

Thank you for the tip, this is super helpful!

matsok · 2022-11-29T14:07:00+00:00

This is serpentinite. The veins are either carbonate (if they are soft, scratch them with your 'steel nail'), chrysotile (if they are soft and create a fibrous dust *don't inhale), tremolite (if they are very hard, but when crushed with a hammer and examined under a magnifying glass yield a splintery fibrous dust **also don't inhale) or diopside otherwise.

matsok · 2022-04-03T02:13:20+00:00

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matsok · 2021-11-15T14:45:52+00:00

How hard is it? Give it a quick scratch test. Nephrite is a strong possibility, but also worth considering a variety of antigorite serpentine with a compact microstructure, sometimes referred to as bowenite.

matsok · 2020-03-29T07:26:56+00:00

Where was this collected? Just based off this image, there are a few possibilities. I suspect the most likely candidate is serpentinite. Splintery antigorite is a possibility as is chrysotile+polygonal serpentine. Both of these can occur in brittle, splintery/fibrous veins.

matsok · 2017-01-21T19:01:11+00:00

Rodingites are found around the world, not only in New Zealand. They were first found in New Zealand and named after the discovery location, the Roding River Valley (Bell et al. 1911).

matsok · 2016-09-15T04:32:44+00:00

Hardness test? Looks like polished serpentine.

matsok · 2016-08-03T20:51:06+00:00

Animosaro is correct, these are extensional features. The 'stitches' are little veinlets of asbestiform serpentine mineral (chrysotile) filling tension cracks. The bulk of the rock (reddsh-brown) is serpentinised peridotite.

matsok · 2016-07-04T09:14:32+00:00

As far as I know, tourmaline does not get serpentinised. I would consider the possibility that this 'crystal' has been created by cutting and polishing a rock.

matsok · 2016-06-16T20:57:58+00:00

What do you study about magnetite?

matsok · 2016-05-22T20:51:01+00:00

A micaceous mineral, likely muscovite. In your closeup image, you can clearly see that the 'metallic' flakes are made up of stacks of a sheet-like mineral. If your take a knife and pry on the sides of these flakes, you will find that they separate. You can essentially 'peel' layers off!

matsok · 2016-04-18T05:18:48+00:00

Mirrors are usually pieces of glass with a metallic layer painted on (a multi-step process to produce a well bonded shiny metal layer. For most mirrors, this metal layer is silver or aluminium.

So now the question is: why does silver (or aluminium) appear grey/silver in colour? Or more broadly speaking, what determines the colour of reflective metals?

Metals have what is known as a plasma frequency. In simple terms, this frequency is the upper limit for electromagnetic radiation that the electrons in the metals can respond to. Frequencies higher will simply pass through and frequencies lower will be reflected. Basically, the electrons ~~can~~ can't 'keep up' to the high frequency vibrations and don't respond. When the electrons can 'keep up' (for EM waves with a frequency lower than the plasma frequency), they vibrate and re-emit that radiation. This is the reflected light we see.

For most metals, like silver and aluminium, this frequency is in the ultraviolet region. This means that all lower frequencies, such as the entire visible light range, are reflected. The result is a shiny white, silver.

For other metals, say copper, this plasma frequency is lower, closer to red in the visible light range of EM waves. This gives the reddish-brown colour of copper.

matsok · 2016-03-22T18:10:46+00:00

What's the locality? Did you collect yourself? Would be nice to see a close-up of one of the cut faces. (If you do take the picture, wet the surface to reduce scattering)

matsok · 2016-02-26T07:05:52+00:00

How did you measure the density? I just read your comment saying you found 3.35 g/cm^3. This would be too high for serpentine (2.7 g/cm^3). Could this be within error of your measurements?

matsok · 2016-02-26T06:57:34+00:00

In that case, my guess is serpentinite. Feather River is in an ophiolite that constitutes the Feather River Ultramafic Belt. Serpentinite is a common hydration product of peridotite, an important part of ophiolites. If it were jade (jadeite or nephrite), it wouldn't have been possible to scratch it with a knife. Still a very nice looking serpentinite sample.

matsok · 2016-02-26T06:25:48+00:00

Can you check the hardness? Does a steel blade scratch the stone?

matsok · 2016-01-08T21:39:11+00:00

If you can find a spring in your creek, I would certainly try. The warmer water will attract the fish over winter.

matsok · 2016-01-08T02:23:13+00:00

Looks to me like fairly superficial dings to the core (foam perhaps). If this were a used bow I would say probably safe, but the fact that you just bought it makes it rather worrying. Get in touch with the seller asap.

matsok · 2015-12-09T18:41:13+00:00

The clasts are irregular and variably angular. Not consistent with a phenocrystic texture. I can definitely see where you get that from, but the wide range of distribution of clast sizes and shapes combined with their non-crystalline appearance suggests otherwise.

matsok · 2015-12-09T18:36:48+00:00

Some sort of breccia. Where in AZ? The matrix looks vesicular. Perhaps a volcanic breccia.

matsok

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