Synchysite

Formula: CaY(CO 3) 2F; Ca(Ce,La)(CO 3) 2F; CaNd(CO 3) 2F; BaCe(CO 3) 2F (Huanghoite-(Ce)); Ca(Ce,La)(CO3)2(OH) (Hydroxylsynchysite-(Ce))Mohs scale hardness: 4,5 (6-6.5?) Specific gravity: 3,9 g/cm3Rare earth elements: Nd, Y, La, CeRare earth content, %: REOmax=51,3 %Mineralklasse: CarbonateSynchysite (CaY(CO

3)

2F) contains 42,13 % Y2O3Synchysite (doverite) is a group of carbonate minerals. The three isostructural chemical end members are Synchysite-(Ce), Synchysite-(Nd) and Synchysite-(Y). Huanghoite-(Ce) belongs to the group, but has a different symmetry and calcium is replaced by barium.

Association: Kainosite, bastnaesite, xenotime, hematite, quartz (Dover, New Jersey, 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 Co., and the Big Bertha and White Cloud pegmatites, South Platte district, Jefferson Co., Colorado; from Rib Mountain, Marathon Co., Wisconsin. In the Evans-Lou quarry, near Wakefield, Quebec, Canada. Around Gallt y Wenallt, Gwynedd, Wales. On the west flank of Cherbadung, 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.

References

  1. https://en.wikipedia.org/wiki/Synchysite

  2. http://webmineral.com/data/Synchysite-%28Y%29.shtml#.VzzTmiE4B0s

  3. http://www.handbookofmineralogy.org/pdfs/synchysite-%28Y%29.pdf

  4. http://www.mindat.org/min-3855.html

  5. http://www.classicgems.net/gem_synchysite.htm

  6. http://link.springer.com/article/10.1007%2Fs007100170019#page-1

  7. http://www.mindat.org/gallery.php?min=3855