is a rare calcium yttrium
cerium carbonate fluoride mineral. The mineral Synchysite
is actually divided into three distinct minerals based on their respective
dominant rare earth element; Synchysite-(Ce)
with cerium, Synchysite-(Nd) with neodymium and
Synchysite-(Y) with yttrium. Most Synchysite is Synchysite-(Y).
Synchysite-(Y) occurs as
translucent to opaque brownish-recl
aggregates in association with Xenotime, Hematite,
was originally discovered in
1894, but Synchysite-(Y) was discovered in 1951 at the
Scrub Oaks iron Mine, Mine Hill, 4 km west of Dover, Morris County, New Jersey, USA.
At that time it was thought to be a possible new yttrium
fluorocarbonate mineral and was named Doverite after
the nearby town. It was later determined to be a yttrium
dominant variety of Synchysite and IMA approved in 1966. Synchysite-(Y)
is named from the Greek
word σύγχΰσις (synchys) meaning confounding in allusion to its initially being mistaken for Parisite,
and the "-(Y)" suffix due to the dominance of yttrium in the composition.
One of the main sources of Synchysite-(Y) is at the
White Cloud pegmatite, South Platte district, Jefferson
County, Colorado, USA.
distribution: in the USA, from the Scrub Oaks iron mine,
Mine Hill, 4 km west of Dover, Morris Co., New Jersey;
at the Henry pegmatite, near Cotopaxi, Fremont County,
and the Big Bertha and White Cloud pegmatites, South
Platte district, Jefferson County, Colorado; from Rib
Mountain, Marathon County, Wisconsin. In the Evans-Lou
quarry, near Wakefield, Quebec, Canada. Around Gallt
y Wenallt, Gwynedd, Wales. On the west flank of Cherbadung
[Pizzo Cervandone], Binntal, Valais, Switzerland. At
Bad Grund, Harz Mountains, Germany. Crystallized in
the Bantyshevo salt stock, Dnieper-Donets Basin, Ukraine.
From the Jabal Sa’id pegmatite, central Saudi Arabia.
At Xiaocaidan, Qinghai Province, China.