sideriit
Sideriit is a rare and valuable gemstone composed primarily of iron oxide, with a chemical composition similar to hematite (Fe₂O₃). Unlike traditional gemstones, sideriit is not typically polished for jewelry but is instead used in its raw, crystalline form. It is known for its metallic luster and deep, earthy red to brownish-red hues, often exhibiting a silky or pearly sheen when light reflects off its fibrous structure.
Discovered in the late 20th century, sideriit is primarily found in the Kola Peninsula of Russia, particularly
Sideriit is not commonly used in traditional jewelry due to its softness (around 3.5–4 on the Mohs
The name "sideriit" derives from the Greek word *sidēros*, meaning "iron," reflecting its iron-rich composition. While