Crystal is one of the seven resources found in most Heroes of Might and Magic games. It is one of the rarer resources, less common than Ore or Wood, but as common as Gems, Mercury, and Sulfur.
Crystal is associated with the Crystal mine. For each flagged crystal mine, the owner receives one unit of crystal per day.
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Heroes II crystals
Heroes III crystals
Heroes IV crystals
Heroes V crystals
Heroes (Game Boy Color) crystals
M&M Heroes Online crystals - notice the white color