The big gold nugget theory

[tamrock]

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Scientists find seismic role in formation of large gold nuggets

Forces unleashed by quakes squeeze quartz enough to generate electric fields, driving formation of deposits

www.theguardian.com

 

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[Assembler]

Magnetic susceptibility values for common mineral and rock types (Sharma, 1997).

Mineral or rock type Magnetic susceptibility (k x 10−6 SI)

Granite (with magnetite) 20–40,000

Slates 0–1200

Basalt 500–80,000

Oceanic basalt 300–36,000

Limestone (with magnetite) 10–25,000

Gneiss 0–3000

Sandstone 35–950

Hematite (ore) 420–10,000

Magnetite (ore) 7×104–14×106

Magnetite (crystal) 150×106

A magnetic susceptibility value describes how much a material becomes magnetized when exposed to an applied magnetic field, essentially indicating its tendency to be attracted or repelled by a magnet; it's a dimensionless quantity calculated by dividing the magnetization of a material by the applied magnetic field strength, with a positive value signifying paramagnetic behavior (attracted to a magnetic field) and a negative value indicating diamagnetic behavior (repelled by a magnetic field).

"magnetic susceptibility" measures how easily a material becomes magnetized when exposed to an external magnetic field, whereas "magnetic permeability" describes how readily a material allows magnetic field lines to pass through it, essentially indicating its ability to form an internal magnetic field within itself when exposed to an applied magnetic field; in simpler terms, susceptibility is a measure of how much a material is magnetized, while permeability is a measure of how well a material allows magnetism to pass through it.

A material's permeability indicates how easily an external magnetic field can induce an internal field in the material. The stronger the internal field, the stronger the force of attraction. A material's permeability is not constant but rather changes based on several factors.

 

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[Assembler]

A material's permeability indicates how easily an external magnetic field can induce an internal field in the material. The stronger the internal field, the stronger the force of attraction. A material's permeability is not constant but rather changes based on several factors.

A recurring fault zone is good for changes based on a number of factors. The internal field will change effecting the force of attraction in this zone. Very hard to measure close up for man yet nature will leave traces in each effected rock zone that can be looked at.

 

[Assembler]

Magnetite properties

It is one of the most abundant metal oxides, and its crystal structure contains both the ferrous (Fe+2) and ferric (Fe+3) forms of iron ions. A complex pattern of electrons between the two forms of iron is the source of its magnetic nature.

Magnetite crystals usually only occur when magma cools slowly enough for crystals to form and settle out of the magma. These crystals are typically octahedrons to dodecahedrons (eight-sided to twelve-sided shapes) that may exhibit fine lines (known as ‘striations’) on some surfaces.

https://commonminerals.esci.umn.edu...t is one of the,source of its magnetic nature