mineral
Red Jasper and Hematite
Silicon Dioxide (SiO2) and Iron Oxide (Fe2O3)
Hardness: 6.5-7 for Jasper, 5.5-6.5 for Hematite. Color: Brick red and metallic grey/black. Luster: Vitreous to dull (Jasper), Metallic (Hematite). Structure: Hexagonal/Trigonal.
- Hardness
- 6
- Color
- Brick red and metallic grey/black
- Luster
- Vitreous to dull (Jasper), Metallic (Hematite)
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Physical properties
Hardness: 6.5-7 for Jasper, 5.5-6.5 for Hematite. Color: Brick red and metallic grey/black. Luster: Vitreous to dull (Jasper), Metallic (Hematite). Structure: Hexagonal/Trigonal.
Formation & geological history
Jasper is a microcrystalline variety of quartz formed by silica-rich fluids in volcanic or sedimentary environments. Hematite forms as a primary mineral in iron-rich sedimentary deposits or via hydrothermal activity.
Uses & applications
Used extensively in jewelry as tumbled stones and beads, lapidary carvings, and as decorative pocket stones. Hematite is also a primary ore of iron.
Geological facts
Red Jasper is colored by high concentrations of iron inclusions. Hematite is famous for having a blood-red streak when rubbed against a rough porcelain plate, despite its metallic exterior.
Field identification & locations
Identify Jasper by its opaque red color and quartz hardness. Identify Hematite by its high density/weight and metallic shine. Common in diverse global locations including Brazil, India, and the USA.
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