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Formula: Sr3Ce(PO4)(CO3)3
Carbonate phosphate, strontium- and
cerium- bearing mineral
Crystal System: Trigonal
Specific gravity: 3.81 measured, 3.71 calculated
Hardness: 4½
Streak: White
Colour: Pale yellow
Luminescence: Not fluorescent under UV
Solubility: Soluble in dilute hydrochloric acid, hardly soluble in ammonium acetate
Weakly RADIOACTIVE
Environments
Plutonic igneous environments
Carbonatites
Localities
At the Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada,
daqingshanite occurs in an intrusive alkalic gabbro -
syenite complex, associated with
albite, ancylite,
pyrite, anatase and
chlorite
(HOM).
Daqingshanite-(Ce) from the Poudrette Quarry -
Image
At the type locality, the Bayan Obo deposit, Bayan Obo, Bayan Obo mining district, Baotou City, Inner Mongolia, China,
daqingshanite occurs in monomineralic aggregates in veins cutting
dolomite in the footwall zone. The deposit consists of Proterozoic (2.5
billion years ago to 541 million years ago) layered dolomite and minor
arkose units which host iron
mineralisation. Minerals associated with daqingshanite include
benstonite, huntite,
strontianite, pyrite,
phlogopite and monazite.
Daqingshanite occurs as small, rhombohedral crystals with rounded edges, about 0.05 mm in size. The colour is
pale yellow, with a greasy-glassy lustre and a white streak
(AM 69.811).
At the Kamthai deposit, Barmer District, Jodhpur Division, Rajasthan, India, daqingshanite occurs as two
paragenetic types:
(1) Primary granular coarse grained crystals coexisting with
primary
carbocernaite, baryte and
bastnäsite
(2) Aligned micro-ovoid globules within clasts of strontium-bearing
calcite. Carbocernaite forming
trellis-type lamellae in some of these calcite clasts does not represent
exsolution, but the lamellae are considered as replacement textures as they formed subsequent to daqingshanite.
(MM 88.400–411).
Carbonatites (sensu lato) are distinguished on a
mineralogical-genetic basis as primary, high-temperature magmatic
rocks as opposed to low-temperature, carbothermal, deuteric residual deposits for which the name “carbothermalites” is
proposed. Carbothermal deposits are analogous to hydrothermal ore deposits and are formed from fluids dominated by
CO2 and/or carbonate anions
(https://www.sciencedirect.com/science/article/abs/pii/S0024493722002705).
The Kamthai deposit is best described as a low temperature carbothermalite
microbreccia consisting of a wide variety of clasts resulting from the
autobrecciation of rocks formed during, and after, the magmatic to
carbothermal transition of an undetermined parental
calcite carbonatite-forming magma. Many clasts have been
replaced by late stage lanthanum-enriched fluids during the final
low-temperature stage of evolution of the deposit
(MM 88.400–411).
At the Nkumbwa Hill Carbonatite, Isoka, Isoka District, Muchinga Province, Zambia, daqingshanite occurs in
altered magnesiocarbonatite associated with
dolomite, monazite,
isokite, apatite,
strontianite and quartz
(HOM).
Daqingshanite-(Ce) from Nkumbwa Hill -
Image
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