Scottite

Scottite is a rare mineral species that is a hydrated calcium silicate. Its chemical formula is Ca2Si2O5(OH)2·2H2O. Scottite is known for its distinctive fibrous or acicular crystal habit, often forming radiating aggregates or as coatings on other minerals. It typically appears in pale colors, ranging from white to light gray or pinkish.

The mineral was first discovered in the Franklin Mine in Franklin, New Jersey, United States, and was named in honor of Dr. Arthur Scott, a prominent mineral collector and benefactor of the American Museum of Natural History. Scottite is usually found in association with other rare minerals characteristic of the Franklin-Sterling Hill mining district, which is renowned for its unique mineralogy and zinc-iron-manganese skarn deposits.

Geologically, scottite is believed to form under low-grade metamorphic conditions or as a secondary mineral formed by the alteration of other calcium-bearing silicates. Its occurrence is very limited, making it a mineral of considerable interest to collectors and mineralogists. Analysis of scottite reveals the presence of silicon, calcium, oxygen, and hydroxyl groups, along with interstitial water molecules within its crystal structure. While not economically significant, scottite contributes to the understanding of mineral formation processes in specific geological environments.