mineral
Tumbled Hematite
Iron(III) oxide (Fe2O3)
Hardness: 5.5-6.5; Color: Silver-grey to metallic black (when polished); Luster: Metallic; Crystal system: Trigonal/Hexagonal; Streak: Red to reddish-brown.
- Hardness
- 5
- Color
- Silver-grey to metallic black (when polished)
- Luster
- Metallic
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Physical properties
Hardness: 5.5-6.5; Color: Silver-grey to metallic black (when polished); Luster: Metallic; Crystal system: Trigonal/Hexagonal; Streak: Red to reddish-brown.
Formation & geological history
Formed as a primary mineral in igneous rocks or as a precipitate from water (banded iron formations). Common in sedimentary environments and oxidized zones of hydrothermal deposits.
Uses & applications
Primary ore of iron; commonly used in jewelry as beads or 'black diamonds', and as a grounding stone in metaphysical practices.
Geological facts
Despite its metallic grey exterior when polished, its streak is always deep red, which is how it earned its name from the Greek word 'haima' for blood.
Field identification & locations
Identify by its high density (heavy for its size), metallic luster, and the characteristic red streak produced when rubbed on unglazed porcelain.
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