synchisite

synchisite

[′siŋ·kə‚sīt]
(mineralogy)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The results to date have indicated that the light rare earths (LREE) in the Nechalacho deposit are contained in four minerals: allanite, monazite, bastnaesite and synchisite, and the heavy rare earths (HREE) are present in two minerals: fergusonite and zircon, the latter also being host to zirconium (Zr).
Avalon Rare Metals (TSE:AVL) Provides Progress Report on Metallurgical Testwork, Nechalacho Rare Earth Elements Deposit, Thor Lake, Northwest Territories, Canada
The Trimouns talc-chlorite deposit is a mineral locality of international significance, producing fine crystal specimens of rare earth element-bearing species including allanite/dissakisite, bastnasite, synchisite, parisite, hingganite and iimoriite.
Allanite/dissakisite can be associated with bastnasite, synchisite, parisite, quartz, calcite, and very rarely with hingganite.
A particularly remarkable association should be noted: it consists of millimeter-size flakes of bastnasite deposited as a crown around synchisite (a syntactic intergrowth).
Dolomite is commonly found in association with calcite and quartz, and is almost always the matrix hosting crystals of bastnasite, synchisite, and allanite and/or dissakisite.
These pseudomorphs occur as isolated crystals ranging up to 10 cm in size, and as groups of subhedral crystals associated with allanite and/or dissakisite, aeschynite, synchisite, parisite, bastnasite and, more rarely, cassiterite.
Andreas had six miniature matrix specimens with crude, opaque 3-cm bastnasite crystals (possibly interlayered with synchisite) lying flat in them; but also he had a few more of the loose, 2-cm, gem crystals.
Denver Show 2000
Among them are some species only recently identified by X-ray analysis, such as synchisite.
Late-formed synchisite crystals rest on faces of quartz crystals.
Oh yes, Gilles also showed me a few thumbnails of opaque white, rough-surfaced calcite pseudomorphs after blocky crystals of the (very rare) Ste.-Hilaire species shortite, as well as a few loose, 5-cm prismatic sprays of synchisite pseudomorphs after the new mineral petersenite, in an opaque, mottled white/gray-brown color.
Tucson Show 1999
The locality is known for samarskite and a variety of other interesting species such as fayalite, gadolinite, zinnwaldite, bastnaesite, synchisite and xenotime.
Two such are the superb synchisite in Figure 5 and the rare species tilasite [ILLUSTRATION FOR FIGURE 6 OMITTED].

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