What causes wavy bands of light and dark minerals?

What causes wavy bands of light and dark minerals?

Wavy bands of dark minerals visible in gneiss bedrock probably formed from the (1) cementing together of individual mineral grains (2) cooling and crystallization of magma (3) evaporation of an ancient ocean (4) heat and pressure during metamorphism.

What happens to rocks with increasing pressure and temperature?

When pressure and temperature change, chemical reactions occur to cause the minerals in the rock to change to an assemblage that is stable at the new pressure and temperature conditions. Thus higher temperature can occur by burial of rock. Temperature can also increase due to igneous intrusion.

Can a butane torch melt gold?

To melt gold, you require a torch that reaches a sufficient temperature. Butane torches, propane torches and oxy-acetylene torches are all good choices for melting gold. A butane torch can reach a temperature of 2,500 degrees Fahrenheit.

Can you melt gold with a propane tank?

A propane flame is hot enough to melt pure gold. It will also melt gold alloys but the melting process does not separate gold from other elements, like silver or copper. Gold is one of the most expensive elements in the world and is well known for its use in jewelry.

Can a butane torch melt copper?

Consumer air butane torches are often claimed to develop flame temperatures up to approximately 1,430 °C (2,610 °F). This temperature is high enough to melt many common metals, such as aluminum and copper, and hot enough to vaporize many organic compounds as well.

Can you melt gold on a spoon?

Since gold has a lower melting temperature that stainless steel , can gold flakes be melted in a teaspoon. Of course while holding the spoon with pliers or a vise , with borax in the spoon with the flakes.

Can you melt gold with a torch?

Many people like to melt it down and make their own golden creations. Because gold has a moderately low melting point for a metal, it can be melted with a standard propane torch. Once melted, gold can be poured into molds to harden or pounded with a mallet into thin strips.