brownmillerite
Sign in to saveAlso known as IMA1963-017, calcium aluminoferrite
Brownmillerite is a rare oxide mineral with chemical formula . It is named for Lorrin Thomas Brownmiller (1902–1990), chief chemist of the Alpha Portland Cement Company, Easton, Pennsylvania.
Key facts
- Mineral.name
- Brownmillerite
- Mineral.image
- Brownmillerite-103177.jpg
- Mineral.imagesize
- 260px
- Mineral.caption
- Red/red-brown crystals of brownmillerite from Caspar quarry, Bellerberg Volcano, Ettringen, Mayen, Eifel Mts, Rhineland-Palatinate, Germany
- Mineral.category
- Oxide mineral
- Mineral.IMAsymbol
- Bmlr
- Mineral.strunz
- 4.AC.10
- Mineral.dana
- 7.11.2.1
- Mineral.system
- Orthorhombic
- Mineral.class
- Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
- Mineral.symmetry
- Ibm2
- Mineral.unit cell
- a = 5.57 Å, b = 14.52 Å, c = 5.34 Å; Z = 4
- Mineral.color
- Reddish brown
- Mineral.habit
- As minute square platelets; massive
- Mineral.diaphaneity
- Semitransparent
- Mineral.gravity
- 3.76
- Mineral.opticalprop
- Biaxial (−)
- Mineral.refractive
- nα = 1.960 nβ = 2.010 nγ = 2.040
via Wikipedia infobox
Wikidata facts
- Image
- Brownmillerite-103177.jpg
Show 7 more facts
- Commons category
- Brownmillerite
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 4.AC.10
- Nickel-Strunz 9th edition (updated 2009)
- 4.AC.10
- crystal system
- orthorhombic crystal system
- IMA Mineral Symbol
- Bmlr
- chemical formula
- Ca₂(Al,Fe³⁺)₂O₅
- Strunz 8th edition (series ID, updated)
- IV/A.08
Sources (3)
via Wikidata · CC0
~2 min read
Encyclopedic overview
4 sectionsContents
- Discovery and occurrence
- Use as a catalyst
- See also
- References
Brownmillerite is a rare oxide mineral with chemical formula . It is named for Lorrin Thomas Brownmiller (1902–1990), chief chemist of the Alpha Portland Cement Company, Easton, Pennsylvania.
==Discovery and occurrence==
Excerpted from Wikipedia’s “brownmillerite” article, available under the CC BY-SA 4.0 licence.