Davidite-(La)

minerals

ilmenite

rutile

Formula: La(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38
Multiple oxide, members of the crichtonite group
Specific gravity: 4.42
Hardness: 6
Streak: Brownish black
Colour: Black
RADIOACTIVE
Environments

Plutonic igneous environments
Pegmatites
Carbonatites
Hydrothermal environments

Davidite-(La) occurs as a primary mineral in high-temperature hydrothermal veins; in norite and anorthosite; in alkalic rocks and also granite pegmatites and carbonatites. Associated minerals include rutile, titanite, magnetite, ilmenite, apatite, tourmaline, epidote, albite and calcite (HOM).

Localities

At the Thackaringa District, Yancowinna county, New South Wales, Australia, a specimen has been found which is a small amount of davidite-(La) with a bit of anatase coating and large rutile crystals and some quartz with a bit of mica (AM 46.700-718).

At Crocker Well (Crocker's Well), Mt Victor Plumbago Station, Olary Province, South Australia, Australia, davidite-(La) has been found as a black, pitchy mass associated with albite (AM 46.700-718).

At the type locality, Radium Hill mine, Radium Hill area, Olary Province, South Australia, Australia, davidite-(La) was found in an intimate intergrowth with ilmenite and rutile and much black mica, with which were mixed minor amounts of chalcopyrite and carbonates (AM 46.700-718, AM 64.1010-1017).

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