brownmillerite

Also 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

~2 min read

Encyclopedic overview

4 sections

Contents

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.