Armalcolite
Chemical compound
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Armalcolite is a titanium-rich mineral with the chemical formula Ti₂O₅. It was first found at Tranquility Base on the Moon in 1969 during the Apollo 11 mission, and is named for Armstrong, Aldrin and Collins, the three Apollo 11 astronauts. Wikipedia
IMA symbol: Arm
Classification: Mineral
Color: Gray to tan in reflection, opaque
Crystal class: Dipyramidal (mmm); H-M symbol: (2/m 2/m 2/m)
Crystal system: Orthorhombic
Formula (repeating unit): (Mg,Fe2+)Ti2O5
Luster: Metallic
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