In the formation of mineral crystals

English land law is the law of real property in England and Wales. Because of its heavy historical and social significance, land is usually seen as the most important part of English property law. Ownership of land has its roots in the feudal system established by William the Conqueror after 1066, but is now mostly registered and sold on the real estate market. The modern law's sources derive from the old courts of common law and equity, and legislation such as the Law of Property Act 1925, the Settled Land Act 1925, the Land Charges Act 1972, the Trusts of Land and Appointment of Trustees Act 1996 and the Land Registration Act 2002. At its core, English land law involves the acquisition, content and priority of rights and obligations among people with interests in land. Having a property right in land, as opposed to a contractual or some other personal right, matters because it creates priority over other people's claims, particularly if the land is sold on, the possessor goes insolvent, or when claiming various remedies, like specific performance, in court.

Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. Produced from felsic lava, obsidian is rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows. These flows have a high content of silica, giving them a high viscosity. The high viscosity inhibits the diffusion of atoms through the lava, which inhibits the first step (nucleation) in the formation of mineral crystals. Together with rapid cooling, this results in a natural glass forming from the lava.

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