Uedaite-(Ce)

uedaite-(Ce)

allanite-(Ce)

monazite-(Ce)

thorite

Images

Formula: Mn²⁺CeAl₂Fe²⁺(Si₂O₇)(SiO₄)O(OH)
Valence: Mn²⁺Ce³⁺Al₂Fe²⁺(Si₂O₇)(SiO₄)O(OH)
Sorosilicate (Si₂O₇ groups), allanite group, epidote supergroup, manganese- and cerium- bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.19 calculated for the empirical formula
Hardness: 5 to 6
Streak: Grey
Colour: Black to dark brown
Environments

Plutonic igneous environments

Localities

At the type locality, Marutoku Quarry, Shodoshima, Kagawa Prefecture, Japan, uedaite-(Ce) was found in granite intruding into the Ryoke metamorphic belt. Both granite and metamorphic rocks have been widely covered by volcanoclastic sediments. The uedaite-(Ce) is a manganese-rich mineral in the allanite group that was recognised with allanite-(Ce), monazite-(Ce), zircon and thorite in a sample of heavy mineral separates. The short, prismatic crystals are less than 1 mm in length, translucent to opaque, black to dark brown in colour with a grey streak and vitreous lustre (AM 93.11.1944-1945).
Uedaite-(Ce) from Marutoku Quarry - Image

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