Tranquillityite
An iron-titanium-zirconium silicate — one of the three minerals first discovered in Apollo 11 Moon rocks.
Intro adapted from Wikipedia (CC BY-SA).
Tranquillityite is an IMA-recognized mineral species in the silicate class, with the chemical formula Fe²⁺₈Ti₃Zr₂Si₃O₂₄.
It crystallizes in the hexagonal crystal system. It is a member of the Braunite structural group.
Key properties: specific gravity 4.7; optically isotropic.
IMA symbol Trq, IMA status: approved, named in 1971.
A late-stage crystallization product of lunar basaltic magma.
It is found associated with Troilite, pyroxferroite, tridymite, cristobalite, alkalic feldspar, felsic glass.
The name refers to the Sea of Tranquillity, Moon, from which the mineral was first collected.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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