| M417 
’ DETAILS 
ee) ee from terrestrial and lunar 
a hd 3 
in) of their host rock (or 
parce Des analysis numbers, together 
with references relating both to the first report for that 
occurrence, and to the sources of the analytical data. Full 
chemical analyses, where available, are given in Table 3. 
Kimberlite. Raber & Haggerty (1979) report zirconolite from 
three localities in South Africa. All their microprobe analyses 
are presented in Table 3 (K1 to K3); however, two analyses (K1 
and K2) have significantly higher ZrO, values than all other 
zirconolites reported. The number of Zr cations for these 
analyses, recalculated on the basis of 7 oxygens, exceed the 
theoretical value by >50% and >100%. It seems probable 
therefore, that these analytical data are in error, or that the 
minerals analysed are not zirconolite. Calzirtite has been 
suggested as a possible alternative mineral for one of these 
questionable phases (Kogarko et a/., 1991). Analyses K1 and K2 
are thus omitted from comparative data of zirconolites (such as 
in Table 1). 
Zirconolite described by Raber & Haggerty (1979) is very 
fine-grained, associated with baddeleyite, + zircon, ilmenite, 
armalcolite and calcite, and is considered to have been formed as 
a secondary mineral due to infiltration of, and reaction with, a 
carbonatitic fluid. 
Ultrabasic Rocks. Zirconolite has been described from two 
ultrabasic cumulate complexes — Laouni, Algeria (Lorand & 
Cottin, 1987) and Rhum, Scotland (Williams, 1978). 
At  Laouni zirconolite occurs as compositionally 
homogeneous, discrete grains up to 200um in diameter, in 
plagioclase-rich adcumulates. Although baddeleyite also occurs 
in this intrusion, it is located in cumulates richer in trapped 
intercumulus liquid. Analyses Ul—U2 (Table 3) are from Lorand 
& Cottin (1987). 
In the layered, ultrabasic complex of Rhum zirconolite occurs 
as a rare, late-stage accessory mineral, associated with apatite, 
baddeleyite and zircon, predominantly in olivine-rich 
mesocumulates — i.e. those cumulates with a relatively high 
proportion of trapped (and fractionated) magma. The 
microprobe analysis (U3, Table 3) is from Fowler & Williams 
(1986). 
Gabbro Pegmatite. Harding et al. (1982, 1984) describe accessory 
zirconolite (reported as ‘zirkelite’), with acicular habit, from a 
gabbro pegmatite of Tertiary age at St. Kilda, Scotland. The 
pegmatite consists essentially of ferroaugite, ferroedenite, 
chlorite, magnetite, Mn-rich ilmenite, quartz and alkali feldspar. 
Associated with zirconolite are the accessory minerals biotite, 
epidote, allanite, titanite, apatite and zircon. The pegmatite is 
considered to have formed from the last residues of basaltic 
(tholeiitic) liquid from which the major Mg-minerals and 
feldspars of the Glen Bay Gabbro had previously precipitated. 
The zirconolite analysis tabulated here (G1, Table 3) is from 
Fowler & Williams (1986). Harding et al.’s (1982) orisinal 
analysis totals only 91%, as it excludes many of the heavy REE, 
Hf and Ta. 
Since the EREE** exceeds 50% of the Ca site cations, it is 
sensu strictu a rare earth mineral, and following the Bayliss & 
Levinson (1988) nomenclature guidelines, this mineral can be 
classified as zirconolite-(Y) [subject to approval from the 
CNMMN]. 
C.T. WILLIAMS AND R GIERE 
Syenite. Zirconolite has been described from four syenite 
localities. 
At Glen Dessarry, Scotland (Fowler & Williams, 1986), 
zirconolite occurs as an accessory mineral in a rock consisting of 
aegirine augite, edenitic amphibole, hypersolvus alkali-feldspar, 
orthoclase, albite and biotite. Zirconolite, typically <10pm in 
diameter, is enclosed by alkali feldspar phenocrysts and 
associated with Fe-Ti oxides, titanite, allanite, apatite and 
zircon. The microprobe analysis (S1, Table 3) is from Fowler & 
Williams (1986). 
Zirconolite is reported in the alkaline intrusions of the 
Arbarastakh massif, Aldan, Russia, where segregations of 
zirconolite occur in fa] ‘...micatized  large-grained 
pyroxenite .. .’ with accessory apatite and ilmenite (Borodin er 
al., 1960). In Table 3, analyses $2 (Borodin et al., 1960) and S3 
(Gaidukova ef al., 1962) are wet chemical determinations on 
mineral separates; analysis S4 (Wark et a/., 1973) is a microprobe 
analysis of a separate zirconolite grain. 
Zirconolite (described as ‘polymignite’) was reported from the 
syenite pegmatites of Fredicksvarn, S. Norway by Berzelius 
(1824), and was a mineral separately analysed by Brogger (1890) 
using ‘classical’ wet chemical techniques (S5, Table 3). It also 
occurs at Langesundfjord, near Larvik in coarse-grained syenite 
pegmatites (S6 and S7, Table 3 — previously unpublished 
microprobe data). 
Zirconolite (reported as ‘polymignite’) was described from a 
‘sanidinite’ at Campi Flegrei, Italy (Mazzi & Munno, 1983). No 
analysis is included in Table 3, because the total of the reported 
analysis is low. Material is no longer available for analysis 
(Munno pers. comm., 1992). 
Nepheline Syenite. At Pine Canyon, Utah, USA, zirconolite was 
found as an accessory mineral associated with hibonite, 
perovskite and pseudobrookite (Agrell et al., 1986). The 
rock-forming minerals include corundum, nepheline and 
Mg-hercynite. Analyses (NSI-NS6, Table 3) are previously 
unpublished wavelength-dispersive microprobe data (CTW). 
At the Elk Massif, Poland, zirconolite and Nb-zirconolite are 
reported in an association with apatite, fluorite and pyrochlore 
in agpaitic nepheline syenite pegmatites (Dziedzic, 1984). The 
major minerals of the pegmatites are microcline, nepheline, 
aegirine, arfvedsonite, and more rarely eudialyte. No analytical 
data are given for the zirconolite. 
At Chikala, Chilwa Alkaline Province, Malawi, zirconolite 
occurs also as an accessory mineral, up to 0.3mm in size, in a 
nepheline syenite (sample number BM1980,P23(1), Platt ef a/., 
1987 — microprobe analyses NS7-NS1I1, Table 3). The 
rock-forming minerals are alkali feldspar, nepheline, biotite, 
apatite and an opaque oxide phase. 
At Tchivira, Angola, niobian zirconolite is reported as 
intimately crystallized with wohlerite from nepheline syenite 
rocks of the alkaline complex (Mariano & Roeder, 1989). 
Analyses NS11 to NS16 are previously unpublished microprobe 
data of zirconolite-(Y) [see above] from Tchivira. 
At Pilanesberg, Transvaal, South Africa (Lurie, 1986), 
zirconolite occurs as an accessory mineral (A.N. Mariano, 
personal communication, 1993). No analytical data is reported. 
At Tre Croci, near Vetralla in the Vico Volcanic complex of 
the Roman Comagmatic Province, Latium, Italy, crystalline 
epitaxial zirconolite occurs as an accessory mineral associated 
with baddeleyite, zircon and rare thorian hellandite in a 
sanidinitic eyjectum with-nepheline and sodalite (G.C. Parodi, 
personal communication, 1993). Analyses NS1I7 to NS21 are 
previously unpublished microprobe data from this locality. 
