ITEM DETAILS - sizes may vary because its natural gemstones made by nature sizes are around 0.25-0.50 inches (5-8 mm) Most black obsidians contain nanoinclusions of magnetite, an iron oxide. Very few samples of obsidian are nearly colorless. In some stones, the inclusion of small, white, radially clustered crystals (spherulites) of the mineral cristobalite in the black glass produce a blotchy or snowflake pattern (snowflake obsidian). ~ Healing ~ Balance during changes Purification Psychic ability Manifestation Practicality Metamorphoses Transformation Snowflake Obsidian is calming and soothing.