Hematite

Hematite, a common iron oxide mineral, is a significant ore of iron, known for its reddish-brown to black color and characteristic metallic luster. Its name derives from the Greek word 'haima,' meaning blood, alluding to the red streak it leaves when rubbed against an unglazed surface (a property used for identification). Chemically, it's primarily composed of ferric oxide (Fe2O3). Hematite's crystal system is trigonal, often appearing in various forms including massive, earthy, and micaceous. It's widespread in sedimentary, metamorphic, and igneous rocks globally, frequently found in banded iron formations and hydrothermal deposits, and is also known as the source of the red pigment used in paints and cosmetics throughout history.

Hematite meaning with examples

• The geologists discovered a rich vein of hematite, indicating the presence of a valuable iron ore deposit. The metallic sheen of the mineral caught the sunlight, highlighting the hematite's characteristic luster. Examining the red streak left by the hematite on the streak plate helped the mineralogist identify its composition. Further analysis revealed the hematite was primarily composed of ferric oxide (Fe2O3), common in most formations found in the area. Careful extraction would be necessary to mine the hematite without damaging the surrounding formations.
• Ancient civilizations utilized powdered hematite to create vibrant red pigments for cave paintings and decorative objects. The artist carefully ground the hematite into a fine powder, ready to mix with binding agents. The discovery of hematite remnants at an archeological dig sheds light on the artistic techniques of a forgotten people. The pigments derived from hematite were known for their durability and resistance to fading. Analysis of these pigments provides insight into trade routes and material sourcing of past civilizations.
• In the banded iron formations, layers of hematite alternate with silica-rich bands, showcasing the mineral's role in geological processes. The formation tells a story of ancient ocean chemistry and microbial activity. The rhythmic layering of hematite and other minerals within the formation offers clues to past climate conditions. The presence of hematite within the rock provided a useful record of the Earth’s historical atmosphere. Studying the formations helps understand the processes that led to the concentration of the hematite ore.
• The construction project required the use of reinforced concrete, incorporating hematite to increase its density. Adding hematite to the cement mix significantly increased the durability of the construction material. The density of the hematite made the concrete more resistant to radiation and other environmental damage. The incorporation of hematite improved the overall properties of the construction material in this setting. The use of hematite allowed for stronger, and longer lasting construction materials.
• The reddish hue of the sandstone cliffs hinted at the presence of hematite in the surrounding geological formations. The scenic landscape was colored by the effects of oxidized iron minerals. The subtle color variations in the rock led to the initial geological analysis. The weathered hematite had imparted a rich red stain, indicating the iron oxide's presence. Examining the geological context helped understanding how the hematite contributes to these formations.