Perrierite-(Ce)

perrierite-(Ce)

perrierite

perrierite-(La)

chevkinite-(Ce)

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Formula: Ce4MgFe3+2Ti2O8(Si2O7)2
Sorosilicate (Si2O7 groups), chevkinite group, paramorph of chevkinite-(Ce), cerium- and titanium- bearing mineral

Specific gravity: 4.29 to 4.45
Hardness: 5½
Streak: Brown
Colour: Brown, reddish brown, black
Solubility: Gelatinises in hydrochloric acid and dissolves in hot sulphuric acid
Weakly RADIOACTIVE
Environments

Plutonic igneous environments
Pegmatites
Sedimentary environments
Hydrothermal environments
Lunar environments

Perrierite-(Ce) occurs as a minor accessory mineral in volcanic ash beds, but it is more commonly found in alkalic or peralkaline granites, granite pegmatites, syenites and syenitic pegmatites; it also occurs in tuffaceous sands, and rarely in granodiorites or anorthosite and gabbro (Dana).

The paramorphs chevkinite-(Ce) and perrierite-(Ce) are the most common members of the chevkinite group. Both have been reported from a wide range of igneous, metamorphic, and hydrothermal rocks types, but occurrences in mafic rocks are rare. Chevkinite-(Ce) and/or perrierite-(Ce) occur with other titanium-, zirconium- and rare-earth-element- bearing accessory phases in tholeiitic dolerite from Western Australia, and in moon rocks, and they are more abundant than has been recognised previously in mafic igneous rocks. Chevkinite-(Ce) and perrierite-(Ce) from mafic rocks have distinctive chemical compositions with higher zirconium content than that recorded in examples from most other common rock types. Among mafic rocks, two groups are recognised: the high-Fe group (>8 wt% FeO) is chevkinite-(Ce), while the low-Fe group (<8 wt% FeO) is consistent with perrierite-(Ce), and both minerals can occur within a single hand specimen (AM 99.1911-1921.).

Localities

The type locality is the Nettuno seashore, Nettuno, Metropolitan City of Rome Capital, Lazio, Italy.

Tranquillity Base, Mare Tranquillitatis, The Moon. Chevkinite-(Ce) and/or perrierite-(Ce) occur with other titanium-, zirconium- and rare-earth-element- bearing accessory phases in rocks brought back from the Apollo 11 landing site (AM 99.1911-1921.).

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