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Questions tagged [rock-magnetism]

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3
votes
1answer
127 views

Can someone please help me identify my rock?

Hey guys! My name is Brent and I found this rock over 20 years ago while swimming with my siblings in Lake Huron near Kincardine, Ontario. I actually found it under water at one of our favourite ...
5
votes
1answer
120 views

Identification: mystery rock with golden features and shimmer

I found this rock in our backyard in Germany. As our garden is filled with bushes it was very oddly placed and I have carried this rock around with me ever since, wondering what sort of rock it might ...
10
votes
2answers
209 views

Is there a “submerged object” in Australia that causes a magnetic deviation of 20 degrees?

This answer quotes this blogpost as an example of a magnetic anomaly: Basalt formation, “Mt. Jim”, in remote north-east Victoria, Australia, has a magnetic anomaly -20 degree magnetic compass ...
0
votes
1answer
99 views

What on Earth in can repel a magnet? [closed]

The iron in blood is naturally repelled by a solid magnet the opposite of iron outside of blood by a magnetic field and I wander... Are there any elements that are repelled by a solid magnet? https://...
2
votes
1answer
469 views

Central Texas ore/rock identification

Many of these specimens were found in San Antonio, TX, and the Texas Hillcountry (Kerrville and Bulverde). They seem to have iron content due to rust/oxidized color. Some, but not all, specimens have ...
3
votes
1answer
96 views

Is there a high-temperature, non-magnetic glue that doesn't dissolve in water?

I have very small mineral samples, and I'm looking for a glue that can hold them through a sample preparation process that I'm doing: heating, polishing, and measuring magnetic moment. For that I want ...
2
votes
1answer
832 views

Magnetic rocks no magnetite

I got some sand out of a river bed and moved a magnet through it. Some of the particles I picked up were definitely small crystals of magnetite, but a lot of others were small, round brown rocks that ...
8
votes
2answers
655 views

Rock ID: Large, heterogeneous, magnetic rock in Cascade Range, Washington, USA

I found this rock in a glacial till in north central Washington State, on the east side of the Cascade Range. The dark round crystals are roughly 1 inch (2.54 cm) by 2 inch (5.08 cm) in size. The ...
8
votes
0answers
106 views

A faster way to measure the rock magnetic S-ratio?

The S-ratio is commonly used in rock magnetic and enviromagnetic studies to quantify the relative abundances of minerals with high and low remanent coercivities. As most frequently defined (e.g. by ...