hercynite
Sign in to saveHercynite is a spinel mineral with the formula FeAl2O4.
Key facts
- Mineral.name
- Hercynite
- Mineral.category
- Oxide minerals Spinel group Spinel structural group
- Mineral.image
- Hercynite.jpg
- Mineral.imagesize
- 260px
- Mineral.formula
- Fe2+Al2O4
- Mineral.IMAsymbol
- Hc
- Mineral.molweight
- 173.81 g/mol
- Mineral.strunz
- 4.BB.05
- Mineral.system
- Isometric
- Mineral.class
- Hexoctahedral (mm) H-M symbol: (4/m 2/m)
- Mineral.symmetry
- Fdm (no. 227)
- Mineral.color
- Black
- Mineral.habit
- Euhedral crystals. Also massive to granular
- Mineral.cleavage
- [111] indistinct
- Mineral.fracture
- Uneven – flat surfaces (not cleavage) fractured in an uneven pattern.
- Mineral.mohs
- 7.5
- Mineral.luster
- Vitreous (glassy)
- Mineral.refractive
- n = 1.8
via Wikipedia infobox
Wikidata facts
- Subclass of
- oxyspinel group
- Named after
- Bohemian Forest
- Image
- Hercynite-73060.jpg
Show 7 more facts
- IMA Mineral Symbol
- Hc
- Strunz 8th edition (series ID, updated)
- IV/B.01a
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 4.BB.05
- Commons category
- Hercynite
- chemical formula
- Fe²⁺Al₂O₄
- Nickel-Strunz 9th edition (updated 2009)
- 4.BB.05
- crystal system
- cubic crystal system
Sources (1)
via Wikidata · CC0
~1 min read
Encyclopedic overview
1 sectionsContents
- References
Hercynite is a spinel mineral with the formula FeAl2O4.
It occurs in high-grade metamorphosed iron-rich argillaceous (clay-containing) sediments as well as in mafic and ultramafic igneous rocks. Due to its hardness it also is found in placers.
Excerpted from Wikipedia’s “hercynite” article, available under the CC BY-SA 4.0 licence.