Dark and black acrylic gems are sometimes needed to accentuate darker expressions in the sand.
Black crystals can symbolize a dedication to one's spiritual practice and a denial of the falseness of the material world. Black is a color of sobriety, piety, self-sacrifice and higher purpose. It is the color worn today by some religion’s priests and pastors.
Black Obsidian is compared to the Great Void or the Great Mystery from which all things are created. It is a stone for spiritual dreaming. Black Obsidian is a teacher stone and a “Warrior of Truth” Obsidian draws one inward to the center of the Self, to the place of truth. Obsidian is a powerful cleanser of a muddy aura and is a strong psychic protection stone, shielding you against negativity.