mineral
Magnetite (likely in Hematite or Ironstone)
Magnetite (Fe3O4)
AI-generated identification · may be incorrectHardness: 5.5-6.5; Color: Black to dark gray; Luster: Metallic to submetallic; Crystal Structure: Isometric (often octahedral); Specific Gravity: 5.1-5.2; Notable: Strong magnetism.
- Hardness
- 5
- Color
- Black to dark gray
- Luster
- Metallic to submetallic
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Physical properties
Hardness: 5.5-6.5; Color: Black to dark gray; Luster: Metallic to submetallic; Crystal Structure: Isometric (often octahedral); Specific Gravity: 5.1-5.2; Notable: Strong magnetism.
Formation & geological history
Formed in igneous or metamorphic environments through high-temperature processes or hydrothermal veins. Often found in banded iron formations (BIF) dating back billions of years (Archean to Proterozoic).
Uses & applications
Primary ore of iron; used in heavy media separation, as a toner in photocopiers, and in scientific research for its magnetic properties.
Geological facts
Magnetite is the most magnetic naturally occurring mineral on Earth. Naturally magnetized pieces are known as lodestones and were used in some of the first magnetic compasses.
Field identification & locations
Identify in the field by its black streak on a porcelain plate and its strong attraction to magnets. Found globally in iron-rich deposits.
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Sandstone (with potential mineral staining/concretions)
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
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Septarian Pebble
Septarian nodule / Concretion
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