Obsidian is a stone of truth, protection, integrity, honesty and grounding. This stone awakens the inner warrior and provides courage to enter our subconscious mind and rediscover our hidden abilities. Obsidian, in general, protects our mind from all sorts of negative energies. Because of its reflective, mirror-like surface, Obsidian works like a mirror in which we can clearly see our own mistakes and weaknesses. Moreover, this stone will provide assistance and insight into the possible ways of correcting those mistakes. Obsidian is also believed to block the geopathogenic radiation.
The color of Obsidian can be very different, from black, brown, and blue to green, silver, red and bright golden. It is composed out of 70-80 pecent of silica, SiO2 and about 20-30 percent of MgO and Fe3O4 (magnesium and iron oxide). Its hardness is not too high, ranging between 5 and 5.5 on the Mohs scale.
Obsidian is a natural volcanic glass formed in the process of rapid quenching of volcanic material. Silica (Rock crystal) comprises some 35 to 80 percent of this stone. The chemical composition of Obsidian is very similar to that of Granite, which was also rapidly cooled down which resulted in avoiding crystallization. In its red, brown or black color, Obsidian is a compact amorphous mineral with hardness comparable to glass. Cristobalite crystals are often associated with some of the spotted Obsidian varieties.