The distinctive markings in these snowflake obsidian tumbled stones are inclusions of spherulite. Spherulites are radiating, needle-like crystalline fibres that occur in certain igneous rocks. They're generally found in those which are glassy or have a vitreous lustre.
The presence of various impurities in obsidian causes different sheens, markings and colours. Black obsidian is the variety most people are familiar with, but there are many others.
These snowflake obsidian crystals are medium-sized tumbled stones, but size can vary from piece to piece.
We also have snowflake obsidian tumbled stones in larger sizes.
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