Heulandite

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Heulandite is a fascinating mineral belonging to the zeolite group. It typically forms in monoclinic crystals and can appear in various colors, including white, green, yellow, and pink. Heulandite is often found in the cavities of volcanic rocks and is known for its pearly luster and perfect cleavage. This mineral was named after the mineral collector John Henry Heuland and is commonly used in geological studies and as a collector's item.