Obsidian Crystals Meanings and Properties
Chakra Alignment: Root
Alternative Names: Volcanic Glass, Apache Tears, Black Lava Glass
Origin: Worldwide, notably Mexico
Mineral Species: N/A
Mineral Group: N/A - a natural volcanic glass
Chemical Formula: ~SiO2
Crystal System: N/A
Colour: Typically black, but many variations occur.
Typical Appearance: Obsidian is considered to be a rock, not a mineral, because of the wide variety of minerals it contains, and technically can have any chemical composition. Mindat states that it is a mixture of cryptocrystalline grains of silica minerals held in a glass-like suspension – in other words, a super-cooled liquid, formed near the end of a volcanic eruption, when water and most of the other elements have already been ejected, leaving mainly silica, which then cools too quickly to crystallise. One explanation is as follows: one of the most unusual types of volcano is the rhyolite volcano, in which the magma has a high silica content, making it viscous. This viscosity prevents gas from being easily released from the magma, usually resulting in an explosive eruption, as in pyroclastic flow. Once the explosion has degassed the volcano, the remaining high-silicate magma extrudes slowly onto the surface, cooling quickly to form the glass-like mineral we know as obsidian.
Chakra Alignment: Root (Base)
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