mineral
Iron-rich jasper or weathered hematite-bearing rock
Ferruginous jasper, primarily microcrystalline quartz (SiO₂) with iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))
AI-generated identification · may be incorrectOpaque orange-red to brown, earthy to dull/waxy luster, irregular fracture, and likely hardness about 6–7 Mohs; the dark gray metallic-looking patch may be hematite or magnetite. Crystal structure is cryptocrystalline quartz, with no visible cleavage.
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Physical properties
Opaque orange-red to brown, earthy to dull/waxy luster, irregular fracture, and likely hardness about 6–7 Mohs; the dark gray metallic-looking patch may be hematite or magnetite. Crystal structure is cryptocrystalline quartz, with no visible cleavage.
Formation & geological history
Forms when silica-rich fluids cement or replace iron-rich sediments and volcanic material, commonly through hydrothermal or weathering processes. Exact geological age cannot be determined from the photograph.
Uses & applications
Used as decorative stone, cabochons, beads, carvings, and lapidary material; iron-rich varieties are occasionally associated with iron-ore deposits. This small, rough specimen has limited commercial value.
Geological facts
The vivid red-orange color comes from finely dispersed iron oxides, while gray metallic zones may indicate concentrated hematite or magnetite. A streak test can help distinguish them: hematite leaves a reddish-brown streak, whereas magnetite leaves a black streak.
Field identification & locations
Common in iron-formation terrains, volcanic regions, and heavily weathered landscapes worldwide. Check for a red-brown streak, test magnetism, and look for a consistent glassy/waxy fracture to distinguish jasper from softer clay or slag.
