zussmanite

Zussmanite is a rare, complex silicate mineral with the chemical formula KCa5Si6O15(OH)3. It is characterized by its distinctive structure, which features layers of silicate tetrahedra interleaved with calcium and potassium cations, along with hydroxyl groups. The mineral typically occurs in fine-grained, radiating aggregates and is often found in association with other rare minerals in specific geological environments.

The most notable occurrence of zussmanite is in the Skardu district of Gilgit-Baltistan, Pakistan, where it was first discovered and described. It is found in pegmatites and metamorphic rocks that have undergone low to medium-grade metamorphism. The color of zussmanite can range from white to pale green or gray, and it possesses a vitreous luster. Its hardness is approximately 5.5 on the Mohs scale, and it has a relatively high specific gravity.

Zussmanite was named in honor of the British mineralogist Jack Zussman, who made significant contributions to the study of silicates. Due to its rarity and the specific geological conditions required for its formation, zussmanite is not a widely distributed mineral. Its study provides valuable insights into the complex geochemistry and mineralogy of specialized rock formations.

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