Brownmillerite

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Brownmillerite
2V angle
75° (measured)
References[2][3][4][5]

Brownmillerite is a rare oxide mineral with chemical formula Ca2(Al,Fe)2O5. It is named for Lorrin Thomas Brownmiller (1902–1990), chief chemist of the Alpha Portland Cement Company, Easton, Pennsylvania.

Discovery and occurrence

The chemical compound was first recognized in 1932 and named for the chemist who identified it. The naturally occurring mineral form of the compound was first recognized in 1964 for occurrences in the Bellerberg volcano, Ettringen, Mayen-Koblenz, Germany.[4]

At the

Kloch, melilite, mayenite, wollastonite, kalsilite and corundum are found. Within the Hatrurim area spurrite, larnite and mayenite are associated.[3]

The mineral is similar to the calcium aluminoferrite phases which are commonly found as components of Portland cement.[citation needed]

Use as a catalyst

Brownmillerite has been found to be a highly active oxygen evolution reaction catalyst in neutral pH.[6]

See also

  • Ye'elimite, C4A3S̅, a rare natural anhydrous calcium sulfoaluminate

References

  1. S2CID 235729616
    .
  2. ^ Mineralienatlas
  3. ^ a b Handbook of Mineralogy – Brownmillerite
  4. ^ a b Mindat.org – Brownmillerite
  5. ^ Brownmillerite data on Webmineral.com
  6. PMID 31501446
    .
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