How do rubies form?

Answer 1

Rubies are formed through a natural geological process that occurs deep within the Earth's crust. They are a variety of the mineral corundum, which is composed of aluminum oxide (Al2O3) with trace amounts of chromium. The formation of rubies involves specific conditions and a combination of geological forces. Here's a simplified explanation of the process:

Origin: Rubies are typically found in metamorphic rocks, which form when pre-existing rocks are subjected to high heat and pressure. The primary sources of rubies are usually marble, gneiss, or basalt rocks.

Heat and Pressure: As these rocks undergo intense heat and pressure, they can undergo metamorphism. This process causes chemical reactions and changes in mineral composition. Corundum, the mineral that eventually forms rubies, is stable under high temperatures and pressure.

Source of Chromium: The presence of chromium is crucial for the red coloration of rubies. It acts as an impurity within the corundum crystal lattice. Chromium is commonly introduced through the presence of other minerals, such as chromite, during the formation process.

Magma Intrusion: In some cases, the geological activity includes the intrusion of magma into the Earth's crust. Magma can carry corundum-bearing rocks towards the surface. The intense heat from the magma can alter the surrounding rocks and promote the formation of rubies.

Crystallization: As the molten magma cools down, it undergoes crystallization. During this process, corundum crystals begin to form in cavities, fractures, or other spaces within the rocks. The presence of chromium impurities within the corundum crystals leads to the red coloration characteristic of rubies.

Erosion and Uplift: Over millions of years, various geological processes such as erosion, tectonic movements, and uplift can bring the rubies closer to the Earth's surface. This exposes them to potential discovery through mining or natural weathering processes.

It's important to note that the formation of rubies is a complex and lengthy process, occurring over millions of years. The specific conditions required for their formation are relatively rare, which contributes to the preciousness and value of these gemstones. You can visit the site "CabochonsforSale" to get details about gemstone.

Answer 2

Ruby crystals form at high temperatures, between 620 and 670°C. They appear to be the features of distal hydrothermal reactions with marble. "They are formed mainly in high-grade metamorphic environments where hydrothermal fluids meet limestone," (Waltham, 1999, p. 144). When there are rutile inclusions present in cabochons, there is a star effect.

Answer 3

Ruby, a variety of the mineral corundum, is formed as a metamorphic mineral associated with regional and contact metamorphism. Contact metamorphism involves the exposure of pre-existing rock to high temperatures from close proximity to magma underground at various depths. Regional metamorphism is due to intense pressures and varying degrees of heat due to the compressional force of tectonic plate collisions, and is usually a deep underground phenomenon.

Answer 4

The ruby gemstone is next only to the diamond in terms of hardness and pricing. For a ruby to be born in the natural environment, a perfect combination of aluminum oxide, correct temperature, correct pressure in the earth's crust and very low silicon content is a requisite. This makes rubies very rarely available gems in nature.

Answer 5

Ruby crystals form as the molten mixture of corundum and aluminum oxide is cooling. The rate of the cooling determines the clarity and size of the crystals.