Large Tumbled White Howlite Stones

Howlite is a white, grey, and brown calcium-based mineral formed by evaporation. It occurs when calcium, boron, and silicon are readily available in an aqueous solution that begins to evaporate. As this solution dries up, the minerals come together to form crystals, somewhat similar to the formation of halite. It typically forms in botryoidal masses that resemble cauliflower heads or nodules. Small, individual translucent crystals of howlite have been encountered, but this type of formation is quite rare.