mineral
Hematite Nodules (Moqui Marbles or similar)
Iron oxide (Fe2O3)
Hardness: 5.5-6.5; Color: Steel-gray to reddish brown; Luster: Metallic to sub-metallic; Crystal Structure: Trigonal/Hexagonal; Specific Gravity: 5.26; Streak: Cherry-red
- Hardness
- 5
- Color
- Steel-gray to reddish brown
- Luster
- Metallic to sub-metallic
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Physical properties
Hardness: 5.5-6.5; Color: Steel-gray to reddish brown; Luster: Metallic to sub-metallic; Crystal Structure: Trigonal/Hexagonal; Specific Gravity: 5.26; Streak: Cherry-red
Formation & geological history
Formed by precipitation from iron-rich groundwater passing through permeable sandstone. Iron minerals aggregate around a nucleus, often during the Jurassic or Cretaceous periods.
Uses & applications
Major ore of iron; used in jewelry (as hematine), polishing compounds (jeweller's rouge), and grounding stones in metaphysical practices.
Geological facts
Hematite was found on Mars by the Opportunity rover, indicating that water was once present on the Red Planet since the mineral usually forms in aqueous environments.
Field identification & locations
Identified by its high density for its size and its distinctive reddish-brown streak when rubbed on unglazed porcelain. Commonly found in desert regions of Utah (USA).
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous