Brownmillerite

Ca₂Fe₃+AlO₅IMA symbol: Bmlrapproved

Brownmillerite is an oxide or hydroxide mineral with the formula Ca2Fe3+AlO5, crystallizing in the orthorhombic system. It has a calculated density of 3.965 g/cm3.

Photos

Brownmillerite specimen photo — Leon Hupperichs · CC BY-SA 3.0 · Commons

Crystallography

Crystal system	orthorhombic crystal systemWikidata (CC0)
Space group	P n m a
Cell (Å, °)	a = 5.3769, b = 14.6032, c = 5.5712; α = 90, β = 90, γ = 90
Cell volume	437.45 Å³, Z = 4
Axial ratios	0.3682:1:0.3815calculated from COD 9015305
Source structure	COD 9015305 (Physics and Chemistry of Minerals, 2008) — 1 of 40 structures

Powder X-ray diffraction (calculated)

d (Å)	2.655	2.688	1.934	2.786	7.302	1.582
I/I₀	100	44.4	41.8	36.1	19.8	19.5

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9015305; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)	3.965 g/cm³calculated from COD 9015305

Classification

Nickel-Strunz (10th)	4.AC.10Wikidata (CC0)
Nickel-Strunz (9th)	4.AC.10Wikidata (CC0)